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1
Berggren, Åsa. "The relevance of stratigraphy". Archaeological Dialogues 16, n. 1 (giugno 2009): 22–25. http://dx.doi.org/10.1017/s138020380900275x.
Testo completoAbstract (sommario):
Not all archaeological remains cause discussions concerning stratigraphy. In Sweden, for example, intense stratigraphy discussions have taken place among archaeologists working mainly with urban sites (see e.g. Larsson 2004), and many of the illustrative examples in the text by McAnany and Hodder are rather well-preserved remains with complex stratigraphic sequences. This is, of course, due to the fact that different remains are stratified to different extents and are thus valued differently regarding this issue. Poorly preserved, sketchy remains scattered in the ground may lack complex stratigraphic relations and are regarded as less relevant for this discussion. However, all archaeological remains have some stratigraphical relation and – as McAnany and Hodder mention – interpretation of stratigraphic sequences is a part of archaeological identity. A greater interest in how stratigraphic sequences are formed in social terms should be relevant for all archaeologists. I believe that archaeologists working with complex stratigraphic sequences, and those who work with less stratified remains, have something to gain from this discussion, but in different ways. McAnany and Hodder state that stratigraphy may be both overdescribed and undertheorized. The problem of overdescription concerns complex stratigraphies, while I think less stratified remains are suffering from a lack of discussion concerning stratigraphy all together.
2
Wu, He Yuan, e Bin Hao. "Third-Order Sequence Division of Yunmengshan and Baicaoping Formation of Proterozoic in Yuxi District of China: an Example from Xiatang Profile in Lushan". Advanced Materials Research 998-999 (luglio 2014): 1492–97. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.1492.
Testo completoAbstract (sommario):
There are controversies on the Proterozoic stratigraphic genesis, division, correlation and palaeogeographical evolution of western Henan in China. Based on the basic description of sedimentary facies, Yunmengshan and Baicaoping formation of Proterozoic typical section in western Henan is divided into 4 third-order sequences. Sequence stratigraphy framework which reflects sedimentary and overlap is established with basis of two kinds of facies-change surface and two kinds of diachrononism in stratigraphical records. Although chronostratigraphic belonging of Precambrian strata is controversial and Precambrian sequential stratigraphic study is tremendously challenging, the establishment of sequence stratigraphy framework of proterozoic Yunmengshan and Baicaoping formation in western Henan provides actual data to reshape palaeogeographic pattern of Palaeoproterozoic North China craton. What is more, it becomes a typical example of characteristics and exploration of stratigraphic accumulation under the background of tidal action.
3
Helwing, Barbara. "What's the news? Thinking about McAnany and Hodder's ‘Thinking about stratigraphic sequence in social terms’". Archaeological Dialogues 16, n. 1 (giugno 2009): 25–31. http://dx.doi.org/10.1017/s1380203809002761.
Testo completoAbstract (sommario):
New thoughts about the use of archaeological stratigraphies! Is this so? The discussion article by Patricia A. McAnany and Ian Hodder aims at the construction of a theoretical framework to expound and discuss the problems of archaeological stratigraphy. Such a theoretical framework is urgently needed, they feel, and has been largely neglected until now. Reading and interpreting an archaeological stratigraphic record, if carried out according to the guidelines they try to establish, may reveal much more information about past social processes that led to the formation of the specific stratigraphy. In the authors' own words, ‘thinking about stratigraphic sequence in social terms is more than an academic exercise’ (quoted from abstract). As the record left behind by ancient communities, archaeological stratigraphies, in their view, take a middle place on a scale from micro-records endowed with meaning (artefacts) to macro-records of contextual meaning preserved in archaeological landscapes. The in-between, the immediate residues of meaningful past human behaviour encapsulated in archaeological sites, remain, in their view, undertheorized.
4
Sharpe, David R., e Peter J. Barnett. "Significance of Sedimentological Studies on the Wisconsinan Stratigraphy of Southern Ontario". Géographie physique et Quaternaire 39, n. 3 (4 dicembre 2007): 255–73. http://dx.doi.org/10.7202/032607ar.
Testo completoAbstract (sommario):
ABSTRACTDetailed facies mapping along Lake Erie and Lake Ontario Bluffs, plus other studies illustrate that sedimentological studies, especially those with geomorphic or landform control, have had three main effects on the Wisconsinan stratigraphy of Ontario: (1) improved understanding of depositional processes and environments of several major rock stratigraphic units, without altering the stratigraphic framework, (2) aided correlation of drift sequences, and (3) questioned previous interpretations and stratigraphic correlations of drift sequences. Thus sedimentological analysis can not be separated from stratigraphy because the interpretation of depositional environnments of many mapped strata relies on their geometry and the inclusion of regional data. The geomorphic control provided by sedimentological study of surface landforms is also important because assessment of older buried sediments such as those at the Scarborough Bluffs has been hampered by the failure to determine landform control. The Late Wisconsinan stratigraphy of Southern Ontario generally remains unchanged, except for questions on the role of climate versus ice margin dynamics. The pre-Late Wisconsinan stratigraphy is scarce and not well defined, yet sedimentary studies support the presence of glacial ice in the Ontario Lake basin for all of the Middle Wisconsinan and possibly earlier, including the formation of the Scarborough delta. Large channel cut and fill sequences in the Toronto area (Pottery Road Formation), initially interpreted as resulting from subaerial erosion, were probably formed by subaqueous or subglacial meltwater erosion. If so, the pre-Late Wisconsinan stratigraphy in southern Ontario changes because the Pottery Road Formation may not be an Early Wisconsinan correlative of the St. Pierre beds. The channel example illustrates that stratigraphie correlation without sedimentological investigations may be misleading.
5
Ganelin, V. G., e Yu B. Gladenkov. "Geohistorical Stratigraphy and Stratigraphic Guides". Stratigraphy and Geological Correlation 26, n. 2 (marzo 2018): 234–41. http://dx.doi.org/10.1134/s0869593818020028.
Testo completo
6
Sennikov, N. V., O. T. Obut, N. G. Izokh, A. V. Timokhin, Yu F. Filippov, T. P. Kipriyanova, E. V. Lykova et al. "THE REGIONAL STRATIGRAPHIC CHART FOR THE ORDOVICIAN OF THE WEST SIBERIAN LOWLAND". Geology and mineral resources of Siberia, n. 3 (2023): 3–39. http://dx.doi.org/10.20403/2078-0575-2023-3-3-39.
Testo completoAbstract (sommario):
A new version of the Regional stratigraphic chart for the Ordovician of the West Siberian Lowland and the explanatory note, compiled in accordance with the Russian Stratigraphic Code, introduce changes, additional and specified data in comparison with the previous (first edition) chart. Since 1998, the stages of the Ordovician chart were changed completely. New stages – Tremadocian, Floian, Dapingian, Darriwilian, Sandbian, Katian and Hirnantian were adopted by Interdepartmental Stratigraphic Committee of Russia. The independent Regional Stratigraphic Scheme for the Devonian of the West Siberian Lowland and the Regional Stratigraphic Scheme for the Cambrian of the Pre-Yenisei Part of West Siberian Lowland were adopted. The proposed scheme for the Ordovician of West Siberian Lowland fills the lower part of the Ordovician-Silurian interval for the West Siberia. New paleontological, stratigraphical, lithological, seismo-stratigraphical data for the Ordovician of the West Siberian Lowland were obtained and generalized. For the first time independent Regional stratigraphic chart for the Ordovician of the West Siberian Lowland was compiled.
7
Šeirienė, Vaida, Tatjana Rylova, Alexander Karabanov, Valentinas Baltrūnas, Irina Savchenko, Bronislavas Karmaza, Svetlana Demidova e Dalia Kisielienė. "The Pleistocene stratigraphy of the south-eastern sector of the Scandinavian glaciation (Belarus and Lithuania) in the light of new data". Baltica 28, n. 1 (1 giugno 2015): 51–60. http://dx.doi.org/10.5200/baltica.2015.28.06.
Testo completoAbstract (sommario):
The paper summarises geological and palaeobotanical investigation data on Pleistocene sediments of recent decades in Lithuania and Belarus. The main problems in Pleistocene stratigraphy and correlation of sections are discussed. As a result the chronostratigraphical correlation chart of Lithuania and Belarus is presented and some changes in local stratigraphic schemes proposed. The majority of the stratigraphical units is comparable and correlates well however some unsolved stratigraphical problems still exist. To solve these problems additional very detail investigations are needed by applying the new modern methods. The lack of the absolute dates of the Pleistocene sediments is the main problem in both countries.
8
Wu, Heyuan, Muneeb Khan e Ping Song. "Sequence Stratigraphy towards its standardization—an important scientific scheme". E3S Web of Conferences 131 (2019): 01034. http://dx.doi.org/10.1051/e3sconf/201913101034.
Testo completoAbstract (sommario):
In the Post-Exxon Era of sequence stratigraphy, various sequence models for the complex stratigraphic records with their response mechanisms are developed. All the models with strong pertinence are endowed, which lead to misapprehension in the conceptual system. Therefore, the standardization of sequence stratigraphy with the aim to provide consistency in the terminology has become an important motive of modern sequence. During the development of sequence stratigraphy, the identification and distinction between normal and forced regression have laid important foundation for the system description of sequence development. This becomes the first step towards the standardization because of model-independent nature. The introduction of model-independent unconventional system tracts in fluvial sequence models, which are low- and high-accommodation system tracts, which turn out to be another successful attempt of towards the standardization of sequence stratigraphy. The four parts of stratigraphic records, which include the complexity and cyclicity in the stratigraphic accumulation process; the non-gradual change and the non-integrity of the stratigraphic records; the variability represented by the diversity of the sequence models and the nature of standardization including variability, will provide more clues and approaches for further sequence stratigraphy development
9
Zalasiewicz, Jan, Will Steffen, Reinhold Leinfelder, Mark Williams e Colin Waters. "Petrifying Earth Process: The Stratigraphic Imprint of Key Earth System Parameters in the Anthropocene". Theory, Culture & Society 34, n. 2-3 (13 febbraio 2017): 83–104. http://dx.doi.org/10.1177/0263276417690587.
Testo completoAbstract (sommario):
The Anthropocene concept arose within the Earth System science (ESS) community, albeit explicitly as a geological (stratigraphical) time term. Its current analysis by the stratigraphical community, as a potential formal addition to the Geological Time Scale, necessitates comparison of the methodologies and patterns of enquiry of these two communities. One means of comparison is to consider some of the most widely used results of the ESS, the ‘planetary boundaries’ concept of Rockström and colleagues, and the ‘Great Acceleration’ graphs of Steffen and colleagues, in terms of their stratigraphical expression. This expression varies from virtually non-existent (stratospheric ozone depletion) to pronounced and many-faceted (primary energy use), while in some cases stratigraphical proxies may help constrain anthropogenic process (atmospheric aerosol loading). The Anthropocene concepts of the ESS and stratigraphy emerge as complementary, and effective stratigraphic definition should facilitate wider transdisciplinary communication.
10
Fortey, Richard A. "Trilobite Evolution and Systematics". Short Courses in Paleontology 3 (1990): 44–65. http://dx.doi.org/10.1017/s2475263000001732.
Testo completoAbstract (sommario):
Trilobites are the most diverse of extinct arthropod groups, being known from several thousand genera; many more are discovered each year. They range in age from near the base of the shell-bearing Cambrian to high in the Permian. Because many trilobites evolved quickly, they have been widely employed in stratigraphy; in the Cambrian they are possibly the most important stratigraphical fossils. This has been a mixed blessing because some experts studying the group have tended to place stratigraphical utility foremost in their taxonomic methods. Stratigraphical boundaries have become taxonomic boundaries. This might not matter for stratigraphy, but it does matter for the other kinds of paleobiological studies which have recently become the center of attention. How, for example, can one study extinction, unless the groups extinguished are natural, monophyletic groups? The extinction of an arbitrary phylogenetic segment at a stratigraphic boundary tells us nothing.
11
Miall, Andrew D. "Empiricism and model building in stratigraphy: The historical roots of present-day practices". Stratigraphy 1, n. 1 (2004): 3–25. http://dx.doi.org/10.29041/strat.01.1.01.
Testo completoAbstract (sommario):
The science of Stratigraphy has, since its inception in the late eighteenth century, been characterized by two contrasting research modes or "cognitive styles" (Rudwick 1982). Empirical (inductive) descriptive stratigraphy began with William Smith, led to the establishment of a data base of stratigraphic units (Murchison, Sedgwick, Lapworth), and formed the basis for modern work to establish and refine a detailed chronostratigraphic time scale (Van Hinte, Berggren). Other workers (Hutton, Lyell, Darwin, Chamberlin, Ulrich, Umbgrove, Sloss, Vail) have sought to identify underlying geological controls, and have built deductive models to explain earth processes, beginning with Hutton's uniformitarianism. Many such models sought evidence of regularity or cyclicity in earth processes ("the pulse of the earth"), including the modern "global-eustasy" model of Vail. There is an ever present danger that models can drive the analysis and presentation of data, particularly where stratigraphic models have been invoked to explain, clarify or codify the stratigraphic record. These problems are not new. Attempts to apply European chronostratigraphic units to North American stratigraphy in the early twentieth century were accompanied by expectations that unit boundaries would be marked by lithologic events, such as unconformities. These expectations were not supported, and this may have been the basis for North American attempts to establish alternative stratigraphies, including what became sequence stratigraphy. Ulrich (1911) thought that stratigraphic successions were created by "diastrophic cycles", and was concerned that regional correlations of these successions did not appear to be supported by the biostratigraphic evidence. Barrell (1917) was one of the first to understand the problems created by the lack of representation of long intervals of time in the geologic record, and developed ideas concerning the relationship between base level change and sedimentation that we now term �accommodation.†Modern work on the chronostratigraphic time scale is based on empirical principles, culminating in the definition of global section and boundary stratotypes for the major chronostratigraphic units. However, a controversy has recently arisen over the preference by some geologists to use distinctive marker events to define boundaries. In some cases, this involves introducing hypotheses about the global extent and geological superiority of such events, rather than relying on the accumulated historical record of biostratigraphic and other data.
12
Mai, Hoàng Đảm, e Thị Thắm Nguyễn. "Biostratigraphic characteristics and correction of the boundary between Miocene and Oligocene sediments in the northern Malay - Tho Chu basin". Petrovietnam Journal 5 (4 luglio 2022): 19–27. http://dx.doi.org/10.47800/pvj.2022.05-03.
Testo completoAbstract (sommario):
Stratigraphic study in oil and gas wells is dependent on the research method and the characteristics of the collected samples, such as sample types and spaces between samples, that is why the stratigraphic boundary of the wells may fluctuate in a certain sedimentary range. Therefore, when re-evaluating the hydrocarbon potential or expanding the petroleum exploration targets of an area, we need to study additional evidence and geological events to correct the stratigraphic boundary of the well and correlate regional stratigraphy. These studies often use biostratigraphic and seismic stratigraphic methods.
This paper provides evidence on biostratigraphy to correct the stratigraphic boundary between Miocene and Oligocene sediments in the northern Malay - Tho Chu basin and compares them with the general stratigraphy of the Malay basin. The research results determined that the top of the Oligocene sediment after correcting is higher than what was specified in the previous studies based on marker fossil findings in a palynomorph abundance cycle; and there are similar biostratigraphic characteristics between the studied area and the Malay basin.
13
May, Steven R., Robert F. Butler e Frances A. Roth. "Magnetic polarity stratigraphy and stratigraphic completeness". Geophysical Research Letters 12, n. 6 (giugno 1985): 341–44. http://dx.doi.org/10.1029/gl012i006p00341.
Testo completo
14
Didei, I. S., e N. E. Ajaegwu. "Palynological and Sequence Stratigraphy Framework of Campanian-Maastrichtian Deposit of Anambra Basin, Awgu Section, Southeast Nigeria". Journal of Applied Sciences and Environmental Management 28, n. 6 (21 giugno 2024): 1697–708. http://dx.doi.org/10.4314/jasem.v28i6.7.
Testo completoAbstract (sommario):
A combination of palynological and palynofacies data are used as lithological evidence to describe sequence stratigraphic framework. Hence, the objective of this paper as to deploy the palynological and sequence stratigraphy framework of Campanian-Maastrichtian deposit of Anambra Basin, Awgu Section, Southeast Nigeria using standard techniques. The sequence stratigraphic analysis of the various succession in the studied outcrop sections identified parasequences limited by flooding surfaces with no evidence of erosion. The Nkporo and Mamu Formations were dated using the associated palynomorphs. The Anambra Basin show some complexity in terms of depositional style, sequence stratigraphy and control during the early and post infill of the structurally control basin. The outcrop sections logged reveals the presence of key stratigraphic surfaces and system tracts. The results from this study provides useful information of reservoir and seal rocks that are essential for hydrocarbon accumulation and stratigraphic trapping on the bases of the alternating high stand, low stand and transgressive system tracts.
15
Guan, Xiaowei, Qian Meng, Chuanjin Jiang, Xinyu Liu e Menglu Han. "Research and Application of Globally Optimized Sequence Stratigraphic Seismic Interpretation Technology: Taking the Lower Cretaceous Shahezi Formation of Xujiaweizi Fault Depression as an Example". Geofluids 2021 (15 settembre 2021): 1–9. http://dx.doi.org/10.1155/2021/7564374.
Testo completoAbstract (sommario):
In the study of sequence stratigraphy in continental rift basins, the use of seismic data to track different levels of sequence stratigraphic boundaries laterally is the key to the division of sequence stratigraphic units at all levels and the establishment of an isochronous sequence stratigraphic framework. Traditional seismic interpretation and the establishment of a 3D sequence stratigraphic structure model are a difficult research work. This paper introduces the concept of cost function minimization and performs global stratigraphic scanning on 3D seismic data to interpret horizons and faults in a large grid. Constrained by the results, human-computer interactive intelligent interpretation, by adding iterative interpretation of geological knowledge, established a global stratigraphic model with a relative geological age. The application in the Lower Cretaceous Shahezi Formation of Xujiaweizi fault depression shows that this technology has improved the accuracy and efficiency of sequence stratigraphic interpretation, and the application of this technology has achieved the interpretation of each event horizon under the current seismic data resolution conditions. In this way, a continuous sequence stratigraphic model is established. From this stratigraphic model, any high-frequency sequence-interpreted seismic horizon can be extracted, which provides a basis for the combination of lateral resolution and longitudinal resolution of subsequent reservoir prediction.
16
Prather, Bradford E., Oriol Falivene e Peter M. Burgess. "Stratigraphic analysis of XES02: Implications for the sequence stratigraphic paradigm". Journal of Sedimentary Research 92, n. 10 (19 ottobre 2022): 934–54. http://dx.doi.org/10.2110/jsr.2022.008.
Testo completoAbstract (sommario):
ABSTRACT Sequence stratigraphy has the potential to provide a consistent method for integrating data, correlating strata, defining stratigraphic evolution, and generating quantifiable predictions. However, the consistent application requires a precise definition of concepts, stratigraphic units, bounding surfaces, and workflow. Currently no single generally accepted approach to sequence stratigraphic analysis exists, nor are there any robust tests of models and methods. Applying conventional sequence stratigraphic analysis to strata from an analog laboratory experiment (eXperimental EarthScape02, XES02) with known boundary conditions and chronology provides some initial robust testing of the models and methods. Despite stratigraphic architectures apparently consistent with those expected within the sequence stratigraphic paradigm, blind-test applications yield: 1) deducted erroneous base-level curves, 2) systems-tract classification mismatches, 3) disconnected systems-tracts type and actual base level, 4) time-transgressive basin-floor fans, and 5) missing systems tracts. Stratigraphic forward models using base-level curves derived from Wheeler diagrams cannot match the timing, redeposited-sediment volume, and depositional environments observed in the XES02 experiment. These mismatches result from common Wheeler diagram construction practice, producing poorly resolved base-level minima timing and base-level fall durations, hence inaccurate fall rates. Consequently, reconstructions of controlling factors based on stratal architectures remain uncertain, making predictions similarly uncertain. A reasonable path forward is to properly acknowledge these uncertainties while performing stratigraphic analysis and to address them through multiple scenario analysis and modeling.
17
Kreager, B. Z., N. D. LaDue, T. F. Shipley, R. D. Powell e B. A. Hampton. "Spatial skill predicts success on sequence stratigraphic interpretation". Geosphere 18, n. 2 (25 febbraio 2022): 750–61. http://dx.doi.org/10.1130/ges02428.1.
Testo completoAbstract (sommario):
Abstract Sequence stratigraphic interpretation and three-dimensional spatial and spatiotemporal skills are considered important for the petroleum industry. However, little is known about the relationship between the two. This study begins to fill this gap by testing whether spatial skills predict success on a sequence stratigraphic interpretation task. Students in this study (N = 78) were enrolled in undergraduate or graduate stratigraphy-focused courses at three U.S. state universities. Students completed (1) a sequence stratigraphic interpretation task with a sequence stratigraphic diagram and Wheeler diagram and (2) two spatial skills tests. Findings of simple linear regressions show that both disembedding (extracting or finding a pattern among other features, which is typically assessed by the hidden-figures test) and mental folding and unfolding (as assessed by the surface development test) are predictive of student success on the full sequence stratigraphic interpretation task. A nested regression, entering mental folding as the initial variable and disembedding as the secondary variable, showed that mental folding and unfolding accounted for almost all of the variance accounted for by disembedding in the simple regression. This may reflect the need to employ disembedding for the test of mental folding. Because the test of disembedding and the test of mental folding and unfolding were correlated, the distinct role of disembedding in stratigraphy remains unclear. However, the results clearly show that mental folding and unfolding is related to student success in sequence stratigraphic interpretation. Future studies should characterize how students utilize these skills, try to determine the causal direction of this effect, and identify good practices for supporting students in the classroom.
18
Seggie, R. J., S. C. Lang, N. M. Marshall, C. J. Cubitt, D. Alsop, R. Kirk e S. Twartz. "INTEGRATED MULTI-DISCIPLINARY ANALYSIS OF THE RANKIN TREND GAS RESERVOIRS NORTH WEST SHELF, AUSTRALIA". APPEA Journal 47, n. 1 (2007): 55. http://dx.doi.org/10.1071/aj06003.
Testo completoAbstract (sommario):
An integrated geological study of the Rankin Trend of the North West Shelf, Australia, was undertaken to underpin the ongoing development of the giant gas fields it contains. The study applied an improved understanding ofthe regional stratigraphy in conjunction with interpretation of the regional-scale Demeter 3D seismic survey and focussed on existing fields, undeveloped discoveries, and exploration prospects. The study included a redescription of 1,500 m of core, a new facies-based petrological analysis, a revision of the well-based stratigraphy and palaeogeographic mapping, and a seismic stratigraphic analysis. Reservoir production and hydrodynamic data were also integrated. The stratigraphic framework was improved by implementing a broad range of depositional and facies analogues and a system-wide sequence stratigraphic approach to understanding lateral and vertical stacking patterns of the reservoir succession. Visualisation and modelling technologies were also employed to more adequately describe genetic reservoir packages.Specific outcomes include: improved correlation of reservoir sequences, application of appropriate subsurface depositional analogues to field descriptions, updated palaeogeographic maps and recognition of palaeosols as stratigraphic marker horizons—resulting in a more consistent regional interpretation framework. This forms the basis for seismic stratigraphic interpretation away from well control.The new regional geological model has enabled the linkage of exploration, development and production understanding across the North West Shelf assets as well as management of geological uncertainties.
19
Kyrylyuk, V. P., e O. V. Gaiovskyi. "REGIONAL METAMORPHISM AND STRATIGRAPHY OF THE BASEMENT OF THE UKRAINIAN SHIELD". Geological Journal, n. 1 (29 marzo 2023): 3–16. http://dx.doi.org/10.30836/igs.1025-6814.2023.1.262162.
Testo completoAbstract (sommario):
Stratigraphic complexes of the Lower Precambrian are everywhere metamorphosed. Therefore, the stratigraphic subdivision of the Lower Precambrian has always been inextricably linked with the study of metamorphism. For some time, the degree of metamorphism of the complexes was even used as an indication of their relative age. With the beginning of the use of isotopic dating, this sign was not confirmed, after which the degree of metamorphism was no longer taken into account in the stratigraphic dismemberment of the shields basement. The degree of metamorphism of the complexes was no longer taken into account for a long time when compiling official stratigraphic schemes of the Precambrian of the Ukrainian Shield, which, in the opinion of many geologists, led to distortions of the real stratigraphy of the basement of this region. The authors of the article believe that the degree of metamorphism can still be used in the development of the stratigraphy of the Ukrainian Shield and, above all, in the stratigraphic study of individual megablocks. The possibility of such use of metamorphism is considered in the cycle of publications. This is the second article in the cycle. The first article describes the stratigraphy and metamorphism of all megablocks of the Ukrainian Shield. A number of conclusions have been made about the regularities of the manifestation of metamorphism. It is shown that older stratigenic complexes in each of the megablocks are characterized by higher temperature metamorphism. This pattern provides a basis for establishing the relative stratigraphic sequence of complexes within individual megablocks based on the degree of their metamorphism. At the same time, the distinctive features of the composition and metamorphism of the stratigenic complexes, according to the authors, are a reflection of the successive stages of the geological development of the Ukrainian Shield in the Early Precambrian and can serve as the basis for compiling of the regional stratigraphic scheme on a historical and geological basis. In this second article of the cycle, modern approaches to the geochronological periodization of the Precambrian are considered: a) geochronometric, adopted for the International “The Geological Time Scale” and b) historical-geological, which is the basis of the “General Stratigraphic Scale of the Lower Precambrian of Russia”. The current “Correlation Chronostratigraphic Scheme of the Early Precambrian of the Ukrainian Shield” is based on the geochronometric approach, which the authors, like many other researchers, consider unacceptable for practical use. The article proposes a variant of the regional stratigraphic scheme of the Ukrainian Shield on a historicalgeological basis, compiled at the level of complexes, which in the final version of the scheme can be divided into series and suites.
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Alekseev, Alexander S., Svetlana V. Nikolaeva, Nataliya V. Goreva, Nina B. Donova, Olga L. Kossovaya, Elena I. Kulagina, Nadezhda A. Kucheva et al. "Russian regional Carboniferous stratigraphy". Geological Society, London, Special Publications 512, n. 1 (12 novembre 2021): 49–117. http://dx.doi.org/10.1144/sp512-2021-134.
Testo completoAbstract (sommario):
AbstractSeveral existing schemes for Carboniferous stratigraphy officially adopted in regions of the Russian Federation are summarized and discussed. These regions with different geological histories and distinct depositional settings include the Moscow Basin, the Urals, North Timan, Siberia, the Kuznetsk Basin and the Mongol–Okhotsk, Verkhoyansk–Okhotsk and Kolyma–Omolon regions. Broad correlations based on macro- and microfossils are possible between the regions, while all regional schemes are correlated to the official Russian General Stratigraphic Scheme for the Carboniferous, using zonations based on orthostratigraphic fossils. The Russian General Stratigraphic Scheme is correlated to the International Stratigraphic Scale using ammonoids, conodonts, foraminifers and palynomorphs.
21
Reilly, Mark, Suzanne Hurter, Zsolt Hamerli, Claudio L. de Andrade Vieira Filho, Andrew LaCroix e Sebastian Gonzalez. "An integrated approach to the Surat Basin stratigraphy". APPEA Journal 59, n. 2 (2019): 940. http://dx.doi.org/10.1071/aj18073.
Testo completoAbstract (sommario):
The stratigraphy of the Surat Basin, Queensland, has historically been sub-divided by formation and unit nomenclature with a few attempts by other authors to apply sequence stratigraphy to existing formation boundaries. At a local- to field-scale, lithostratigraphy may be able to represent stratigraphy well, but at regional-scale, lithostratigraphic units are likely to be diachronous. To date, this lithology-driven framework does not accurately reflect time relationships in the sub-surface. An entirely new integrated methodological approach, involving well tied seismic data and sequence stratigraphic well-to-well correlations compared with published zircon age dates, has been applied to hundreds of deep wells and shallower coal seam gas wells. This method sub-divides the Surat Basin stratigraphy into defendable 2nd order to 3rd order sequence stratigraphic cycles and has required the use of an alpha-numeric sequence stratigraphic nomenclature to adequately and systematically label potential time equivalent surfaces basin-wide. Correlation of wells is the first step in building models of aquifers and coal seam gas fields for numerical simulation of fluid flow, which is necessary for responsible resource management. Lithostratigraphic correlations will overestimate the extent and hydraulic connectedness of the strata of interest. The result may be fluid flow models that do not represent a realistic pressure footprint of the flow. The present sequence stratigraphic method more accurately reflects the disconnectedness of sub-surface coals and sandstones (aquifers) on a field-to-field scale, adjacent field-scale, and basin-wide scale. It forms the basis for improved and more representative modelling of the sub-surface.
22
Scott, R. W. "Are seismic/depositional sequences chronostratigraphic units?" Paleontological Society Special Publications 6 (1992): 264. http://dx.doi.org/10.1017/s2475262200008248.
Testo completoAbstract (sommario):
Sequence Stratigraphic Analysis is claimed to be a “new globally valid system of stratigraphy … a precise methodology to subdivide, correlate and map sedimentary rocks” (Vail et al., 1991, p. 622). Sequence stratigraphic units, such as depositional sequences, depositional systems tracts, and parasequences, are time-equivalent rocks of specific durations controlled by cyclical changes in sediment supply related to eustasy. These units are bounded by regionally extensive unconformities with erosion beneath and onlapping strata above, or by physical surfaces separating either different patterns of stratal geometry or shoaling-up facies units. According to this school, precise correlations are based upon inferred time relations within depositional models.Several key concepts of sequence stratigraphy have their origins in early geological studies. For many years geologists have separated time-equivalent strata by regional unconformities related to changes in climate or sea level, e.g., J. Woodward, 1695 and T. C. Chamberline, 1909. Stratal surfaces, such as bentonites and limestone markers, have been used in place of fossils for time correlations since the first wells were drilled. Stratigraphic models have strongly influenced how we correlate strata since the time of William Smith.Two developments are, indeed, new and have sparked the current resurgence in stratigraphic research. One is the seismic technology to test the physical continuity of strata on a regional scale (50-100 km), and to test the stratal geometry of genetically related depositional packages. The second is the chart of global coastal onlap events and eustasy (Haq et al., 1988).Some key research problems are: (1) how to identify unique, time-significant stratal surfaces; (2) how to test their physical continuity; (3) how to test the time relations within depositional models; and (4) how to identify the unique, time-significant global events recorded in the stratigraphic record. These stratigraphic concepts can be tested by graphic correlation, which is a powerful technique of high precision, quantitative stratigraphy. Its application in Cretaceous sections of the Gulf Coast and Oman, and in the Plio-Pliestocene of the Gulf Coast aids the distinction between synchronous surfaces and diachronous boundaries.
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Brett, Carlton E., Patrick I. McLauglin e Gordon C. Baird. "Eo-Ulrichian to Neo-Ulrichian views: The renaissance of "layer-cake stratigraphy"". Stratigraphy 4, n. 2-3 (2007): 201–15. http://dx.doi.org/10.29041/strat.04.2.14.
Testo completoAbstract (sommario):
Classical notions of “layer-cake stratigraphy" have been denigrated as representing an antiquated “Neptunian" view of the geologic record with the American paleontologist-stratigrapher E.O. Ulrich vilified as its quintessential advocate. Some of the extreme “layer-cake" interpretations of E.O. Ulrich are demonstrably incorrect, especially where applied in marginal marine and terrestrial settings. However, close scrutiny of Ulrich’s work suggests that the bulk was correct and demonstrated considerable insight for the time. Subsequent development of facies concepts revolutionized geologists’ view of time-space relationships in stratigraphy, but rather than focusing on facies patterns within the established stratigraphic (layer-cake) frameworks many geologists in North America came to view strata as parts of diachronous facies mosaics. Recent advances in the development of event and sequence stratigraphic paradigms are beginning to swing the pendulum back the other way. Possible causes of “layer-cake" patterns are numerous and varied, including: (1) parallelism of depositional strike and outcrop belts, especially in foreland basins, (2) very widespread environmental belts developed in low-relief cratonic areas, (3) time-averaging homogenizes facies to a limited extent, resulting in a very subtle signature of lateral change, (4) condensed beds (hardgrounds, bone beds, ironstones, etc.) often form in responses to extrabasinal forces, thus they cross-cut facies, and (5) large events (i.e. hurricanes, floods, tsunamis, eruptions, etc.) are “over represented" in the rock record. A revised (“Neo-Ulrichian") layer-cake paradigm carries many of the original correct empirical observations of pattern, noted by Ulrich, recast in terms of event and sequence stratigraphy.
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McAnany, Patricia A., e Ian Hodder. "Thinking about stratigraphic sequence in social terms". Archaeological Dialogues 16, n. 1 (giugno 2009): 1–22. http://dx.doi.org/10.1017/s1380203809002748.
Testo completoAbstract (sommario):
AbstractFor archaeologists, stratification is an important character of archaeological deposits. Through it, layering is discerned and cultural and evolutionary interpretations are proposed. Archaeologists possess much implicit knowledge about the social practices that produce stratigraphic sequence and the specific, contextualized manner in which layers were built upon or cut into previous deposits. The aim of this paper is to gather together and formalize this knowledge so as to codify conceptual ‘tools to think by’ when recording and interpreting stratigraphy. Relevant literature is widely dispersed and here can only be sampled; authors consider stratigraphy in terms of (1) techniques of terraforming, (2) processes enacted and (3) meaning and interpretation. Techniques and processes are discussed within larger social interpretations such as memory, history-building, forgetting, renewing, cleansing and destroying. Examples are drawn from the Turkish Neolithic site of Çatalhöyük and the ancestral Maya site of K'axob in Belize, Central America, to illustrate the applicability of an approach that here is called ‘social stratigraphy’. A practice-based history of stratigraphy – the recording and interpretation of strata – within archaeology is problematized in reference to codependence with geology, the deployment of labour and centralized authority within the emergent 19th- to early 20th-century field of archaeology. The contributions of and conflicts between British and American stratigraphic schools are considered in light of a potential rapprochement. Contested issues of cultural heritage – such as preservation of selected strata – suggest that thinking about stratigraphic sequence in social terms is more than an academic exercise.
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Miall, Andrew D., John M. Holbrook e Janok P. Bhattacharya. "The Stratigraphy Machine". Journal of Sedimentary Research 91, n. 6 (15 giugno 2021): 595–610. http://dx.doi.org/10.2110/jsr.2020.143.
Testo completoAbstract (sommario):
ABSTRACT There is a significant difference between the average sedimentation rate of a lengthy stratigraphic section spanning many millions of years, and the rate that can be calculated from any short segment within such a section, such segments typically yielding rates several orders of magnitude more rapid than the overall rate. Stratigraphic successions contain numerous surfaces of nondeposition and erosion representing time spans from minutes to many millions of years, which collectively may account for as much as 90% of the total elapsed time that the succession represents. The stratigraphic record is constructed by a range of geological processes that operate over all time scales from seconds to billions of years, and at rates that vary by ten orders of magnitude. The generation of the stratigraphic record can be conceptualized in the form of a mechanical device, which we term the “Stratigraphy Machine.”
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Chen, Liquan, Chaoying Zhao, Hengyi Chen, Ya Kang, Bin Li e Xiaojie Liu. "The Detection and Control Factor Analysis of Active Landslides in Guizhou Province, China, Using Sentinel-1 SAR Imagery". Remote Sensing 15, n. 23 (23 novembre 2023): 5468. http://dx.doi.org/10.3390/rs15235468.
Testo completoAbstract (sommario):
Catastrophic landslides occur frequently in Guizhou Province, China, and the landslides in this area have special geomorphological, geological, and anthropogenic features. In order to detect and explore the distribution pattern and control factors of active landslides in Guizhou, firstly, a total of 693 active landslides throughout Guizhou Province were mapped based on the deformation rate, which was obtained by spatiotemporal filtering and Intermittent Small Baseline Subset (ISBAS) Interferometric Synthetic Aperture Radar (InSAR) techniques. Then, the relationships between the detected landslides and elevation, aspect, slope gradient, and stratigraphic lithology were analysed. Moreover, it was found that the landslides were mainly concentrated in three stratigraphic combinations, that is T1f~P2l−d, T1f~T1yn, and T2g~T1yn. Thereafter, the correlation coefficients between the landslide density and elevation and distance to the stratigraphic boundary were 0.54 and −0.19, indicating that the distribution of landslides was significantly controlled by the elevation and the boundary of specific stratigraphic combinations. Finally, we chose a typical landslide to explore how landslide development was controlled by the combined effects of elevation and stratigraphy by using ascending and descending InSAR results. We revealed that landslides occurred primarily in areas with a steep slope and a stratigraphy characterized by mudstone and sandstone.
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Sergeeva, Nina Dmitrievna, e Viktor Nikolaevich Puchkov. "REGIONAL STRATIGRAPHIC SCHEME OF THE UPPER AND FINAL RIPHEAN AND VENDIAN DEPOSITS OF THE SOUTHERN URALS (PROJECT 2022)". Geologicheskii vestnik, n. 2 (14 luglio 2022): 3–14. http://dx.doi.org/10.31084/2619-0087/2022-2-1.
Testo completoAbstract (sommario):
The need to correct individual stratigraphic levels of the Regional Stratigraphic Scheme of the Upper Precambrian deposits of the Urals, existing since 1993, is due to the receipt of new data from lithological-stratigraphic, geotectonic and isotope-geochronological studies of the Upper Precambrian of the Southern Urals. Significant changes and clarifications in the stratigraphy of the Upper Precambrian formations of the region occurred in the Upper Riphean and Vendian of the Bashkir meganticlinorium in the Southern Urals, where the sections stratotypical for the Riphean and reference for the Vendian are located.
The results of dating igneous (primarily volcanic) rocks in the Riphean by modern methods made it possible to refine the geochronological basis of the Ural and General Stratigraphic Scale of the Upper Proterozoic of Russia and identify a new event level: the final Riphean (Arshinian), corresponding to the Arshinian series. Changes and clarifications to the correlation of local stratigraphic sections of the Upper and Final Riphean and Vendian of the Southern Urals are reflected in the draft scheme.
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Xiao, Zheng. "Application of Seismic Stratigraphic Slice Continuous Browsing Technology to Delicately Characterize River Sedimentary Microfacies". International Journal of Energy 2, n. 3 (23 maggio 2023): 42–45. http://dx.doi.org/10.54097/ije.v2i3.8808.
Testo completoAbstract (sommario):
On the basis of understanding the regional tectonics characteristics and stratigraphic sedimentary characteristics of the study area, the sequence stratigraphic framework within the region is gradually studied by applying the principle of high-resolution sequence stratigraphy, and G4 oil formation is divided into three sets of sand formations, namely, G4 upper, G4 middle, and G4 lower sand formations, and divided into small layers in detail. Through comprehensive analysis of lithofacies, logging facies, and seismic facies, the sedimentary facies of the G4 oil formation are comprehensively analyzed. The main sedimentary facies type of the G4 oil formation is the delta front facies belt, and the most important sedimentary microfacies in the delta front facies belt are underwater distributary channel sedimentary microfacies. Using seismic sedimentology methods, make stratigraphic slices of each sub layer of the G4 oil formation, and use the rapid browsing method of stratigraphic slices to trace river sand in detail.
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Miall, Andrew D. "Logan Medallist 3. Making Stratigraphy Respectable: From Stamp Collecting to Astronomical Calibration". Geoscience Canada 42, n. 3 (29 luglio 2015): 271. http://dx.doi.org/10.12789/geocanj.2015.42.072.
Testo completoAbstract (sommario):
The modern science of stratigraphy is founded on a nineteenth-century empirical base – the lithostratigraphy and biostratigraphy of basin-fill successions. This stratigraphic record comprises the most complete data set available for reconstructing the tectonic and climatic history of Earth. However, it has taken two hundred years of evolution of concepts and methods for the science to evolve from what Ernest Rutherford scornfully termed “stamp collecting” to a modern dynamic science characterized by an array of refined methods for documenting geological rates and processes. Major developments in the evolution of the science of stratigraphy include the growth of an ever-more precise geological time scale, the birth of sedimentology and basin-analysis methods, the influence of plate tectonics and, most importantly, the development, since the late 1970s, of the concepts of sequence stratigraphy. Refinements in these concepts have required the integration of all pre-existing data and methods into a modern, multidisciplinary approach, as exemplified by the current drive to apply the retrodicted history of Earth’s orbital behaviour to the construction of a high-precision ‘astrochronological’ time scale back to at least the Mesozoic record. At its core, stratigraphy, like much of geology, is a field-based science. The field context of a stratigraphic sample or succession remains the most important starting point for any advanced mapping, analytical or modeling work.RÉSUMÉLa science moderne de la stratigraphie repose sur une base empirique du XIXe siècle, soit la lithostratigraphie et la biostratigraphie de successions de remplissage de bassins sédimentaires. Cette archive stratigraphique est constituée de la base de données la plus complète permettant de reconstituer l’histoire tectonique et climatique de la Terre. Cela dit, il aura fallu deux cents ans d’évolution des concepts et des méthodes pour que cette activité passe de l’état de « timbromanie », comme disait dédaigneusement Ernest Rutherford, à l’état de science moderne dynamique caractérisée par sa panoplie de méthodes permettant de documenter les rythmes et processus géologiques. Les principaux développements de l’évolution de la science de la stratigraphie proviennent de l’élaboration d’une échelle géologique toujours plus précise, l’avènement de la sédimentologie et des méthodes d’analyse des bassins, de l’influence de la tectonique des plaques et, surtout du développement depuis la fin des années 1970, des concepts de stratigraphie séquentielle. Des raffinements dans ces concepts ont nécessité l'intégration de toutes les données et méthodes existantes dans une approche moderne, multidisciplinaire, comme le montre ce mouvement actuel qui entend utiliser la reconstitution de l’histoire du comportement orbital de la Terre pour l’élaboration d’une échelle temporelle « astrochronologique » de haute précision, remontant jusqu’au Mésozoïque au moins. Comme pour la géologie, la stratigraphie est une science de terrain. Le contexte de terrain d’un échantillon stratigraphique ou d’une succession demeure le point de départ le plus important, pour tout travail sérieux de cartographie, d’analyse ou de modélisation.
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Pemberton, S. George, Janok P. Bhattacharya, James A. MacEachern e Erin A. L. Pemberton. "Harry Eugene Wheeler (1907-1987): A Pioneer of Sequence Stratigraphy". Stratigraphy 13, n. 2 (2016): 95–110. http://dx.doi.org/10.29041/strat.13.2.02.
Testo completoAbstract (sommario):
Harry Eugene Wheeler (1907-1987) of the University of Washington was a pioneer of genetic stratigraphic principles that form the basis of our modern concept of sequence stratigraphy. Wheeler's papers on what he liked to refer to as "stratology" included the classification of stratigraphic units into lithostratigraphic and biostratigraphic entities, as well as cyclothems, unconformity-bounded units, and the analysis of base-level and its role in forming stratigraphic discontinuities. His work on unconformity-bounded "sequences" ultimately led the International Subcommission on Stratigraphic Classification to define them formally in 1987. The plots used to clarify the time-relationships of rock units are now referred to as "Wheeler diagrams". It is not uncommon that, in any scientific paradigm shift, many of the key pioneers are not fully recognized for their contributions at the time, being significantly ahead of prevailing concepts. It is also not uncommon that, by the time their points of view come into vogue, their contributions may have been largely forgotten with greater recognition given to those who synthesized or "popularized" their concepts. This is certainly true in the fields of seismic and sequence stratigraphy, where, despite the theoretical framework for sequence analysis formulated by Wheeler (1958a), little reference was made to Wheeler's work in the early formulation of these concepts in the 1970s and 1980s. Wheeler, schooled by Blackwelder, Mueller, and Schenck at Stanford and armed with the base-level concept of Joseph Barrell, was one of the first to recognize the concept of time stratigraphy. Due to his unorthodox view of stratigraphy, Wheeler was involved in one controversy after another and his views were deemed to be provocative. While the valuable contributions of latter practitioners and synthesizers are justifiably lauded, the works of original pioneers such as Harry Eugene Wheeler are largely underappreciated.
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Gaudenji, Tivadar, e Mladjen Jovanovic. "Quaternary stratigraphy: Recent changes". Glasnik Srpskog geografskog drustva 92, n. 4 (2012): 1–16. http://dx.doi.org/10.2298/gsgd1204001g.
Testo completoAbstract (sommario):
Corrections to the Quaternary stratigraphic division of Serbia was updated/renewed by lowering limit of the Pleistocene / Quaternary to the beginning of the Gelasian that is at approximately 2.588 million years. Rather than the officially rejected Penck & Br?ckner Alpine stratigraphic model, the use of oxygen isotope stages (OIS / MIS) is recommended. Climatostratigraphic terms glacial and interglacial have a regional applicability and their use is recommended only in areas where there are traces of glaciation, while the terms cold and warm stage (or moderate) stages should be used within the global context. Eopleistocene is a regional term for the former Soviet Union and due to its uniqueness it can hardly be applied in the stratigraphical scheme of the Quaternary depostis in Serbia. With the latest extension of the Lower Pleistocene, further use of Eopleistocene would lead to further confusion in stratigraphic correlation as such the use of the Lower / Early Pleistocene or other appropriate stratigraphic units is recommended.
32
McGowran, Brian, e Qianyu Li. "Stratigraphy: gateway to geohistory and biohistory". Stratigraphy 4, n. 2-3 (2007): 173–85. http://dx.doi.org/10.29041/strat.04.2.11.
Testo completoAbstract (sommario):
Concerned with the ordination, correlation and age determination of the rock record and the events entombed therein, stratigraphy is the central discipline in geohistory and biohistory. We consider (from our Cenozoic perch) changes in stratigraphy since the gestation of the International Stratigraphic Guide—changes in response to the “revolutions" of plate tectonics, bolide theory, sequence stratigraphy and cyclostratigraphy, and a cultural shift away from Lyellian gradualism. We discuss certain strictly stratigraphic matters in terms of the “Hedberg triad" of lithostratigraphy, biostratigraphy and chronostratigraphy, which triad has had its day as the core structure of the Guide. Sequence stratigraphy challenges both the lithostratigraphic formation and the notion of pervasive diachrony. Biostratigraphy flourishes in both its oppelzone and phylozone modes and is integrated increasingly with geomagnetic (the Cenozoic spine) and radiometric evidence in a sequence-and cyclostratigraphic context. Chronostratigraphic classification is hierarchical but rigid nesting is questioned.
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Genov, Ivan. "Comment on “Holocene sedimentation in the southwestern Black Sea: Interplay between riverine supply, coastal eddies of the Rim Current, surface and internal waves, and saline underflow through the Strait of Bosphorus” by O. Ankindinova, A. E. Aksu, R. N. Hiscott [Marine Geology, 420 (2020) 106092]". Review of the Bulgarian Geological Society 81, n. 2 (2020): 77–88. http://dx.doi.org/10.52215/rev.bgs.2020.81.2.6.
Testo completoAbstract (sommario):
Ankindinova et al. (2020) describe a series of hydrological events that have led to sedimentation and stratigraphic variations in the gradual sinking of the Black Sea shelf during the Holocene. A key aspect of the study is the attempt to provide a reliable stratigraphic basis for proving of a transgression in the basin throughout the Holocene. However, the conclusions of this approach run counter to the stratigraphic rules: redeposition and significant hiatus in the transgressive phase change of depth of sediment core location (M05-03P) – principle of superposition; merging of transgressive and regressive deposits into a common stratigraphic unit (contradicts the sequential stratigraphy). For this reason, the stability of the conclusion of Ankindinova et al. (2020) for the totally transgressive Holocene development of the Black Sea is doubtful. In addition, the study is based on the interpretation that the increase in the 87Sr /86Sr ratio is solely dependent on ocean water inflow, which is not always correct for enclosed and semi-enclosed basins.
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Prosser, Giacomo, Giuseppe Palladino, Dario Avagliano, Francesco Coraggio, Eleonora Maria Bolla, Marcello Riva e Daniele Enrico Catellani. "Stratigraphic and Tectonic Setting of the Liguride Units Cropping Out along the Southeastern Side of the Agri Valley (Southern Apennines, Italy)". Geosciences 11, n. 3 (9 marzo 2021): 125. http://dx.doi.org/10.3390/geosciences11030125.
Testo completoAbstract (sommario):
This paper shows the main results of a multidisciplinary study performed along the southeastern sector of the Agri Valley in Basilicata (Southern Italy), where Cenozoic units, crucial for constraining the progressive evolution of the Southern Apennine thrust and fold belt and, more in general, the geodynamic evolution of the Mediterranean area are widely exposed. In particular, we aimed at understanding the stratigraphic and tectonic setting of deep-sea, thrust-top Cenozoic units exposed immediately to north of Montemurro, between Costa Molina and Monte dell’Agresto. In the previous works different units, showing similar sedimentological characteristics but uncertain age attribution, have been reported in the study area. In our study, we focussed on the Albidona Formation, pertaining to the Liguride realm, which shows most significant uncertainties regarding the age and the stratigraphic setting. The study was based on a detailed field survey which led to a new geological map of the area. This was supported by new stratigraphic, biostratigraphic and structural analyses. Biostratigraphic analysis provided an age not older than the upper Ypresian and not younger than the early Priabonian. Recognition of marker stratigraphic horizons strongly helped in the understanding of the stratigraphy of the area. The study allowed a complete revision of the stratigraphy of the outcropping Cenozoic units, the recognition of until now unknown tectonic structures and the correlation between surface and subsurface geology.
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Qayyum, Farrukh, Christian Betzler e Octavian Catuneanu. "Space-time continuum in seismic stratigraphy: Principles and norms". Interpretation 6, n. 1 (1 febbraio 2018): T97—T108. http://dx.doi.org/10.1190/int-2017-0061.1.
Testo completoAbstract (sommario):
Seismic stratigraphy is not only a geometric understanding of a stratigraphic succession, but it also has a close link to the space-time continuum started by H. E. Wheeler (1907–1987). The science follows the fundamental principles of stratigraphy, and the norms that govern seismic interpretation play a fundamental role due to their practical significance. The birth of computer-aided algorithms paved a new platform for seismic interpretation. The ideas from A. W. Grabau (1870–1946) and Wheeler were brought to a new level when space-time continuum was represented using 3D seismic data. This representation is commonly referred to as the Wheeler transformation, and it is based on flattening theories. Numerous algorithms have been introduced. Each suffers from its own problem and follow some assumption. The hydrocarbon industry, as well as academia, should seek a solution that is globally applicable to a stratigraphic succession irrespective of resolution, geologic challenges, and depositional settings. We have developed a review of the principles and norms behind these algorithms assisting in developing the space-time continuum of a stratigraphic succession using 2D/3D seismic data.
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Krayenbuehl, Thomas, Nadeem Balushi e Stephane Gesbert. "Novel geometric classification of 3D seismic and its application to the Habshan clinoforms of Western Oman". Leading Edge 40, n. 3 (marzo 2021): 186–92. http://dx.doi.org/10.1190/tle40030186.1.
Testo completoAbstract (sommario):
The principles and benefits of seismic sequence stratigraphy have withstood the test of time, but the application of seismic sequence stratigraphy is still carried out mostly manually. Several tool kits have been developed to semiautomatically extract dense stacks of horizons from seismic data, but they stop short of exploiting the full potential of seismo-stratigraphic models. We introduce novel geometric seismic attributes that associate relative geologic age models with seismic geomorphological models. We propose that a relative sea level curve can be derived from the models. The approach is demonstrated on a case study from the Lower Cretaceous Kahmah Group in the northwestern part of Oman where it helps in sweet-spotting and derisking elusive stratigraphic traps.
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Yuan, Hong Qi, Ying Hua Yu e Dong Li Sun. "Sequence Boundaries Identification of Putaohua Oil Layer in Qijia-Gulong Area". Advanced Materials Research 734-737 (agosto 2013): 166–69. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.166.
Testo completoAbstract (sommario):
Sequence is a relatively conformable succession of genetically related strata bounded by unconformities or their correlative conformities. The correct identification of sequence boundaries is the key to the success of the sequence stratigraphic approach. Stratigraphic boundaries provide the fundamental framework for the genetic interpretation of any sedimentary succession, irrespective of how one may choose to name the packages of strata between them. Sequence stratigraphy of main research content is mainly chronohorizon (unconformity or conformity) identification, and to determine its causes and characteristics. Then, the key to sequence stratigraphy is identification unconformity and their correlative conformities. Unconformity and their correlative conformities on the seismic profiles, well logs, lithology, paleontology, and geochemical data have distinctive sequence boundaries mark characteristics.
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Lebedev, M. V. "FACIAL UNCONFORMITIES AND FACIAL SERIES IN THE SEQUENCE STRATIGRAPHY". Oil and Gas Studies, n. 6 (20 gennaio 2019): 24–32. http://dx.doi.org/10.31660/0445-0108-2018-6-24-32.
Testo completoAbstract (sommario):
The sequence stratigraphy is currently, on the one hand, a leading approach in the study of the internal structure of sedimentary basins, on the other hand, a creatively developing discipline, the conceptual basis of which is being developed. The concept of a «system tract» is one of the most questionable concepts of sequence stratigraphy. According to the classical definition, system tract is a lateral sequence of facies, in accordance with modern definitions system tract is a geological body bounded by sequence-stratigraphic surfaces. It remains unclear: whether the idea of the lateral ordering of the system tract has been preserved in the modern definition. The author of the article has performed an analysis of two well-known sequence-stratigraphic models to answer this question. It is model Depositional Sequence II and model Depositional Sequence IV. The concepts of «facial unconformities» and «facial series» became the basis of the analysis. The author has constructed his own version of the sequence-stratigraphic model for the sedimentary basin. According to the results of its analysis, the author proposes to include the concept of «facial series» in the theoretical basis of sequence stratigraphy. The concept of a «system tract» is recommended to consider as a geological body bounded by genetic facial unconformities.
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URMANOVA, D., e D. D. HUMPHREY. "STRATIGRAPHIC DEVELOPMENT OF THE DEVONIAN-CARBONIFEROUS COMPLEX OF THE SOUTHERN SIDE OF THE CASPIAN DEEP". Neft i Gaz 131, n. 5 (30 ottobre 2022): 77–93. http://dx.doi.org/10.37878/2708-0080/2022-5.05.
Testo completoAbstract (sommario):
This article presents a study of the stratigraphic development of the Devonian-carboniferous complex of the southern side of the Caspian basin, in which a comprehensive study of sedimentary formations of the subsalt complex and the creation of a stratigraphic model of the Late Paleozoic stage of evolution of the southern Caspian sedimentary basin was carried out based on a refined correlation scheme by Abilkhasimov (2015), with the inclusion of generalized data on the structures of Ansagan and Maksat. The basis for the development of a stratigraphic model in the Late Paleozoic of the Coastal zone of carbonate structures in the south of the Caspian sedimentary basin is the classical structural and formation analysis, which reflects the main features: stratigraphy, tectonics, lithological composition, sedimentation conditions, sediment thickness.
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Nguyen, Chuc Dinh, Xuan Van Tran, Kha Xuan Nguyen, Huy Nhu Tran e Tan Thanh Mai. "The forming mechanisms of Oligocene combination/stratigraphic traps and their reservoir quality in southeast Cuu Long Basin offshore of Vietnam". Science and Technology Development Journal 22, n. 1 (10 aprile 2019): 185–95. http://dx.doi.org/10.32508/stdj.v22i1.1216.
Testo completoAbstract (sommario):
To date, most of the oil and gas production in Cuu Long Basin (CLB) is contributed from structural traps, making them more and more depleted after years of exploitation. Exploration activities in CLB, therefore, are shifting towards other traps, including stratigraphic and/or combination ones. The results of exploration and appraisal activities in recent years have increasingly discovered more hydrocarbons in the Oligocene section; some of them were discovered in combination/ stratigraphic traps. Many studies on Oligocene targets in Southeast CLB have been carried out but only a few mention nonstructural traps. This leads to uncertainty about the forming mechanisms and distribution, as well as unevaluated hydrocarbon potential of these traps. An integrated approach- utilizing methods of seismic sequence stratigraphy, seismic attribute interpretation, and petrophysical/ petrographical analysis- was applied in this research to identify the forming mechanisms of Oligocene combination/ stratigraphic traps in southeast area of CLB and to evaluate their reservoir quality. The research results show that the key forming factor for stratigraphic traps of sand body is lithology change and the one for pinch-out stratigraphic traps is tapering off of sand layers landward or toward the horsts. The reservoir quality of these traps ranges from moderate to good. By integratedly applying the methods, the forming mechanisms and reservoir quality of Oligocene stratigraphic traps could be delineated. In order to optimize the next-stage exploration strategy in CLB, detailed studies on petroleum system, especially top and bottom seals, and the hydrocarbon potential of these stratigraphic traps, need to be carried out.
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Al-Husseini, Moujahed, e Robley K. Matthews. "Arabian Orbital Stratigraphy: Periodic Second-Order Sequence Boundaries?" GeoArabia 10, n. 2 (1 aprile 2005): 165–84. http://dx.doi.org/10.2113/geoarabia1002165.
Testo completoAbstract (sommario):
ABSTRACT A simplified model of orbital-forcing suggests that the Phanerozoic Eon may be represented by 38 periodic second-order depositional sequences (DS2) each lasting about 14.58 million years (my). The DS2s are separated by second-order sequence boundaries (SB2, maximum regression surface) that should be manifested as regional stratigraphic discontinuities (unconformity, disconformity, time hiatus). To test this simple model, the Arabian succession was reviewed to identify candidate regional stratigraphic discontinuities that might be periodic at 14.58 my. Of the 38 predicted SB2s, 34 regional stratigraphic discontinuities were identified within the uncertainty of biostratigraphic-radiometric age dating, or by stratigraphic position. One SB2 could not be positioned in the succession because of ambiguous biostratigraphic dating. One was predicted within a long-lasting hiatus, and another two were predicted within an undifferentiated formation. The four unidentified SB2s reflect on the limitations of the data sample, rather than on the viability of the model. Because the stratigraphic discontinuities represent age spans with bounding ages that are at best believed to have accuracies of about ± 3.0 my, the model-data correlation was considered inconclusive. The resulting analysis, however, demonstrates that the ages in million years before present (Ma) of interpreted Arabian (and possibly global) sequence stratigraphic surfaces and depositional sequences, as estimated by biostratigraphic-radiometric dating techniques, are highly inaccurate (± 5–10 my). This conclusion suggests that presently used chronostratigraphic correlations across the Arabian Platform should be treated with great caution. The correlation of model SB2s to regional stratigraphic discontinuities, affords an alternative time scale that may eventually assist in the calibration of the biostratigraphic-radiometric time scale. An orbital-forcing time scale has a decided advantage in that it comes with precise third- and fourth-order stratigraphic predictions imbedded as sea-level fluctuations. The next level of testing is whether these orbital-forcing predictions hold up to precise correlation to stratigraphy.
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Taylor, Kendrick C., Richard B. Alley, Debra A. Meese, Matthew K. Spencer, Ed J. Brook, Nelia W. Dunbar, Robert C. Finkel et al. "Dating the Siple Dome (Antarctica) ice core by manual and computer interpretation of annual layering". Journal of Glaciology 50, n. 170 (2004): 453–61. http://dx.doi.org/10.3189/172756504781829864.
Testo completoAbstract (sommario):
AbstractThe Holocene portion of the Siple Dome (Antarctica) ice core was dated by interpreting the electrical, visual and chemical properties of the core. The data were interpreted manually and with a computer algorithm. The algorithm interpretation was adjusted to be consistent with atmospheric methane stratigraphic ties to the GISP2 (Greenland Ice Sheet Project 2) ice core, 10Be stratigraphic ties to the dendrochronology 14 C record and the dated volcanic stratigraphy. The algorithm interpretation is more consistent and better quantified than the tedious and subjective manual interpretation.
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Ji, Da Wei, Ji Li e Guang Dong Lu. "Application of Wavelet Transform in High-Resolution Sequence Stratigraphic Division". Advanced Materials Research 772 (settembre 2013): 823–27. http://dx.doi.org/10.4028/www.scientific.net/amr.772.823.
Testo completoAbstract (sommario):
In this paper, the method and effect of logging curves wavelet transform in high-resolution sequence division are discussed, taking the middle oil sequence stratigraphic of DU-432 oil well in north-Songliao basin as an example. Using Wavelet Transform to GR logging curves, the relationship between logging curve signals and depth is transformed to the relationship between the depth and the scale domain, so that the wavelet curves in different scale are obtained. Then the relationship between the periodic oscillation characteristics of the wavelet curves under the best optimal scale factor and the sequence. Comparing the Sequence Stratigraphic Division by wavelet transform with the manual division, Results show that the Division by Sequence Stratigraphic wavelet transform is more objective and more effective and the Division provides a new way to high-resolution sequence stratigraphy.
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Kuleshova, L. S., V. V. Mukhametshin e R. A. Gilyazetdinov. "The role and significance of the tectonic-stratigraphic factor in the formation of the structural features of hydrocarbon deposits of the Volga-Ural oil and gas province". SOCAR Proceedings, n. 1 (30 marzo 2024): 10–17. http://dx.doi.org/10.5510/ogp20240100934.
Testo completoAbstract (sommario):
The article establishes the role and importance of the tectonic-stratigraphic factor in the formation of the structural features of hydrocarbon deposits in the Volga-Ural oil and gas province. It has been established that the type of reservoir, tectonic and stratigraphic confinement of the objects of study determine the geological and physical features of the deposits by more than two thirds and are the basis for the identification of objects at a qualitative level. An algorithm is proposed for selecting analogous objects at a qualitative level for deposits emerging from exploration in the absence of representative data on the geological, physical and physico-chemical properties of formations and fluids based on its belonging to a stratigraphic system, tier, horizon, tectonic element. Keywords: tectonics; stratigraphy; analog objects; identification; image recognition.
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Nakanishi, T., e S. C. Lang. "THE SEARCH FOR STRATIGRAPHIC TRAPS GOES ON—VISUALISATION OF FLUVIAL-LACUSTRINE SUCCESSIONS IN THE MOORARI 3D SURVEY, COOPER-EROMANGA BASIN". APPEA Journal 41, n. 1 (2001): 115. http://dx.doi.org/10.1071/aj00006.
Testo completoAbstract (sommario):
Exploration and development in the Cooper-Eromanga Basin have been predominantly focussed on structural traps. However, the future for exploration and field development lies in exploration for stratigraphic traps. Using advanced visualisation techniques on open file 3D seismic survey data from the Moorari and Woolkina fields in the Patchawarra Trough, Cooper Basin, we have sought to characterise the variety of possible stratigraphic traps in the Permian Patchawarra, Epsilon and Toolachee Formations and also the basal Jurassic Poolowanna Formation. The key to the analysis lies in a genetic-stratigraphic framework using sequence stratigraphy concepts as applied to non-marine basins.Five different types of possible stratigraphic traps are illustrated from the Moorari 3D survey: Isolated fluvial channels in a transgressive systems tract of the lower Patchawarra Formation.Fluvial sand bodies in low accommodation intervals in a lowstand systems tract of the upper Patchawarra Formation.Highstand lacustrine delta of the Epsilon Formation below the regional sequence boundary at the base of the Toolachee Formation.Isolated fluvial channels in the transgressive systems tract of the Toolachee Formation.Crevasse splay channels and crevasse splay delta complex of the transgressive systems tract of the Poolowanna Formation.For each trap type, three dimensional distributions of the possible reservoir and seal rocks are presented and the ranking of stratigraphic trap opportunities is discussed.
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Nguyen, Chuc Dinh, Tu Van Nguyen, Hung Quang Nguyen, Cuong Van Bui, Thanh Quoc Truong e Xuan Van Tran. "Applying seismic stratigraphy analysis for assessing upper Oligocene stratigraphic traps in Southeastern Cuu Long Basin". Science and Technology Development Journal 20, K4 (31 luglio 2017): 48–56. http://dx.doi.org/10.32508/stdj.v20ik4.1112.
Testo completoAbstract (sommario):
As oil and gas production has been going on over a few decades, conventional plays such as pre-Tertiary fractured basement highs and Cenozoic structural traps become more and more exhausted, and the remaining targets of the same type do not have sufficient reserves for development and production. Exploration activities in Cuu Long basin, therefore, are shifting towards more complicating types of plays which are stratigraphic traps and combination traps. Several researches were conducted in southeastern marginal slope and indicated the possibility of stratigraphic pinch-out traps with insufficient petroleum system and low hydrocarbon potential. In spite of many researches, there are still difficulties in defining the distribution and in evaluating hydrocarbon potential of these traps, so seismic stratigraphy analysis in accompanied with interpretation of seismic attribute and well logs is very necessary to support this problem. Seismic stratigraphic analysis on seismic sections, in agreement with seismic attributes’ and log analysis’ findings, show that the stratigraphic/combination traps in Oligocene C and D were formed during lowstand system tract as sigmoid-oblique clinoforms downlapping onto underlying strata in distributary mouths/delta settings. The integration of seismic attribute analysis and well log interpretation has further defined the fan-shaped distribution of these traps. Thus, using various methods, the stratigraphic traps can be better revealed. Further studies, however, need to be carried out to fully evaluate hydrocarbon potential of these stratigraphic/ combination traps, and minimize risks in exploration drilling.
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Wharton, Stanley Rich. "The Rimthan Arch, basin architecture, and stratigraphic trap potential in Saudi Arabia". Interpretation 5, n. 4 (30 novembre 2017): T563—T578. http://dx.doi.org/10.1190/int-2017-0033.1.
Testo completoAbstract (sommario):
The Rimthan Arch, situated between the Arabian carbonate platform and the Gotnia intrashelf basin, represents a world class hydrocarbon province in Saudi Arabia. Middle to Upper Jurassic shallow-water depositional sequences are associated with productive hydrocarbon fields in which challenges exist in defining exploration targets, mainly stratigraphic trap plays. An attempt is made to investigate the basin depositional architecture on the flank of the Arch and also to model the stratigraphic trap potential of the youngest Arab third-order sequence. The basin architecture, stratal geometries, and impact of tectonics are explored using 3D seismic and well data. Seismic chronostratigraphy, seismic stratigraphy, seismic attribute, and log-based reservoir heterogeneity techniques are applied as an integrated approach to interpret the sequences from basin to reservoir scale. The study identifies two second-order sequences, SEQ 1 and SEQ 2, to frame a 3D geologic model and to examine basin development through time. Results derived from the integrated study indicate that although initial basin subsidence began later in SEQ 1 north of the Arch, it increased appreciably during SEQ 2. The Dhruma J20 maximum flooding surface, Lower Fadhili, and Hanifa provide clues in tracking major basin changes. Seismic stratigraphy applications highlight reflection terminations and prograding stratal geometries throughout the stratigraphic section to demonstrate tectonoeustatic influences. Tectonics impact SEQ 2 more intensely than SEQ 1 and may influence the migration of hydrocarbons across juxtaposed lithologies. A complex association between shallow marine tidal and ramp carbonates, and deeper basin halite beds, is linked to the subsiding Gotnia Basin. Log-facies analysis of the Arab third-order sequence demonstrates reservoir and seal trends, including the stratigraphic entrapment potential along a carbonate ramp profile. Seismic attributes support reservoir-depositional trends and salt-bed geometries. The integrated approach provides a targeted workflow to investigate the complex depositional systems and their stratigraphic trapping potential on the Arch.
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Aiello, Gemma. "Marine Geological Studies of the Bay of Naples (Southern Tyrrhenian Sea, Italy): Revised Applications of the Seismo-Stratigraphic Concepts and Evolving Technologies to a Late Quaternary Volcanic Area". Journal of Marine Science and Engineering 12, n. 3 (26 febbraio 2024): 416. http://dx.doi.org/10.3390/jmse12030416.
Testo completoAbstract (sommario):
Marine geological studies of Naples Bay are discussed and reviewed, focusing on the application of the seismo-stratigraphic concepts to a Late Quaternary volcanic area. The Naples Bay represents an active volcanic area in which the interactions between volcanic and sedimentary processes controlled a complex stratigraphic architecture during the Late Quaternary period. While the volcanic processes took place in correspondence with the activity of the Somma–Vesuvius, Campi Flegrei Ischia, and Procida volcanic complexes, the sedimentary processes were controlled by the fluvial processes in the Sarno-Sebeto coastal plain and by the tectonic uplift in correspondence with the Sorrento Peninsula’s structural high Key geophysical and stratigraphic studies of the three active volcanic complexes are revised and discussed. The seismo-stratigraphic concepts applied in the geological interpretation of seismic profiles of Naples Bay are reviewed and discussed: here, the classical concepts of seismic and sequence stratigraphy have been successfully applied, but only partly, due to the occurrence of several buried volcanoes and volcanic seismic units and tephra layers, calibrated by gravity cores.
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Lucas, Spencer G. "Cladistics and Stratigraphy". Geosciences 13, n. 3 (16 marzo 2023): 86. http://dx.doi.org/10.3390/geosciences13030086.
Testo completoAbstract (sommario):
Using cladistic phylogenies (cladograms) to evaluate stratigraphy (taxon distributions and correlations) necessitates various assumptions that include all of the assumptions built into the cladogram, assuming the cladogram is “correct” and that new taxa only arise by dichotomous splitting. Ghost lineages extend back the temporal ranges of sister taxa by assuming that both taxa’s oldest records are the time of dichotomous splitting, the only mode of evolution in cladistics. Other modes of evolution require no ghost lineages (anagenesis) or indicate unequal temporal ranges of closely related taxa (punctuation). Evaluating congruence between cladistic branching patterns and stratigraphic distributions reveals much congruence, simply because the cladogram and the taxa in the stratigraphic distribution are overlapping datasets, and the pattern of evolution is to evolve derived taxa after more primitive taxa. Correlating fossil assemblages based on the phylogenetic signals of their included taxa is little more than correlating by stage of evolution. Claiming that paraphyletic taxa are of less biochronological utility than monophyletic taxa is not borne out by examining correlations provided by the actual stratigraphic ranges of the taxa, regardless of their status in an a posteriori cladistic analysis. Thus, using cladistics to evaluate stratigraphy is assumption laden and of questionable value.
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Ivanova, Daria. "Cadosinidae Wanner, 1940 and Stomiosphaeridae Wanner, 1940 (Incertae sedis) from the Upper Jurassic of the Central Forebalkan, Bulgaria". Geologica Balcanica 24, n. 6 (30 dicembre 1994): 85–102. http://dx.doi.org/10.52321/geolbalc.24.6.85.
Testo completoAbstract (sommario):
Representatives of the Incertae sedis group have been studied from Upper Jurassic sequences in the Central Forebalkan. Their taxonomy and stratigraphic range are objects of this paper. Within the stratigraphic sequence of Lower Oxfordian to Upper Tithonian the limestones of the Javorec, Ginci, Gložene and Neškovci Formations are investigated. This paper is a first attempt for careful study of this important for the Upper Jurassic stratigraphy group. 16 species, belonging to 7 genera have been described. They are related to two families: Cadosinidae Wanner, 1940 and Stomiospaeridae Wanner, 1940.