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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.
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Liu, Cheng Zhi, e Hui Cui Sun. "Geological and Seismic Stratigraphy of Wangfu Sag". Advanced Materials Research 912-914 (aprile 2014): 1637–39. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1637.
Testo completoAbstract (sommario):
By combining seismic with geology, we processing a detailed stratigraphic classification in the Wangfu depressed areas. In this way, targeting the geologic horizons and seismic horizons in the wells according to the synthetic seismic logs. We may gain an Corresponding Relation between seismic with geology. Then compare the stratigraphic division . From the point of evolutionary history of regional structure, geological information generated by tectonic movement was recorded, for example, plane of unconformity, sedimentary cycle, lithology, lithofacies, and their responds in the seismic profile.
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Eagan, William E. "Reading the Geology of Canada: Geological Discourse as Narrative". Scientia Canadensis 16, n. 2 (8 luglio 2009): 154–64. http://dx.doi.org/10.7202/800352ar.
Testo completoAbstract (sommario):
ABSTRACT This article suggests that Sir William Logan's Geology of Canada can be read as a narrative describing the past dynamic changes that shaped the present structure of the earth. The author also suggests, since the foundation of nineteenth century geology was a bio-stratigraphic consensus that combined stratigraphy and the fossil record, that the use of a narrative offered Logan a dynamique method for presenting his central argument.
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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.
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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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Masuda, Fujio. "The geology of stratigraphic sequence". Sedimentary Geology 116, n. 3-4 (marzo 1998): 279–80. http://dx.doi.org/10.1016/s0037-0738(97)00108-5.
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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.
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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.
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Hart, Bruce S. "Whither seismic stratigraphy?" Interpretation 1, n. 1 (1 agosto 2013): SA3—SA20. http://dx.doi.org/10.1190/int-2013-0049.1.
Testo completoAbstract (sommario):
Here, I provide an historical summary of seismic stratigraphy and suggest some potential avenues for future collaborative work between sedimentary geologists and geophysicists. Stratigraphic interpretations based on reflection geometry- or shape-based approaches have been used to reconstruct depositional histories and to make qualitative and (sometimes) quantitative predictions of rock physical properties since at least the mid-1970s. This is the seismic stratigraphy that is usually practiced by geology-focused interpreters. First applied to 2D seismic data, interest in seismic stratigraphy was reinvigorated by the development of seismic geomorphology on 3D volumes. This type of reflection geometry/shape-based interpretation strategy is a fairly mature science that includes seismic sequence analysis, seismic facies analysis, reflection character analysis, and seismic geomorphology. Rock property predictions based on seismic stratigraphic interpretations usually are qualitative, and reflection geometries commonly may permit more than one interpretation. Two geophysics-based approaches, practiced for nearly the same length of time as seismic stratigraphy, have yet to gain widespread adoption by geologic interpreters even though they have much potential application. The first is the use of seismic attributes for “feature detection,” i.e., helping interpreters to identify stratigraphic bodies that are not readily detected in conventional amplitude displays. The second involves rock property (lithology, porosity, etc.) predictions from various inversion methods or seismic attribute analyses. Stratigraphers can help quality check the results and learn about relationships between depositional features and lithologic properties of interest. Stratigraphers also can contribute to a better seismic analysis by helping to define the effects of “stratigraphy” (e.g., laminations, porosity, bedding) on rock properties and seismic responses. These and other seismic-related pursuits would benefit from enhanced collaboration between sedimentary geologists and geophysicists.
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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.
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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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de Beer, C. H. "Update to the South African Stratigraphic Code and Guidelines for Standardised Lithostratigraphic/Lithodemic Descriptions". South African Journal of Geology 122, n. 2 (1 giugno 2019): 257–66. http://dx.doi.org/10.25131/sajg.122.0018.
Testo completoAbstract (sommario):
Summary The South African Committee for Stratigraphy (SACS) is the official body in South Africa which regulates the nomenclature and definition of lithostratigraphic and lithodemic rock units, unconsolidated deposits and soils. The robust framework set in the existing stratigraphic code and guide for publication by the Council for Geoscience (CGS) have for many years provided leadership in this field, but there are a number of aspects in need of reconsideration. One example is the non-compliance of our nomenclature for high-grade supracrustal rocks with international (and South African) stratigraphic codes and another is manuscript format changes necessitated by publishing SACS descriptions in the SAJG. Any stratigraphic code is a living document that should be able to accommodate changing views and circumstances. This review provides a consensus opinion from experts on how to deal with changing needs.
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Lanteaume, Cyprien, François Fournier, Matthieu Pellerin e Jean Borgomano. "Testing geologic assumptions and scenarios in carbonate exploration: Insights from integrated stratigraphic, diagenetic, and seismic forward modeling". Leading Edge 37, n. 9 (settembre 2018): 672–80. http://dx.doi.org/10.1190/tle37090672.1.
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Carbonates are considered complex, heterogeneous at all scales, and unfortunately often poorly seismically imaged. We propose a methodology based on forward-modeling approaches to test the validity of common exploration assumptions (e.g., chronostratigraphic value of seismic reflectors) and of geologic interpretations (e.g., stratigraphic correlations and depositional and diagenetic architecture) that are determined from a limited amount of data. The proposed workflow includes four main steps: (1) identification and quantification of the primary controls on carbonate deposition and the prediction of the carbonate stratigraphic architecture (through stratigraphic forward modeling); (2) identification of diagenetic processes and prediction of the spatial distribution of diagenetic products (diagenetic forward modeling); (3) quantification of the impact of diagenesis on acoustic and reservoir properties; and (4) computation of synthetic seismic models based on various scenarios of stratigraphic and diagenetic architectures and comparison with actual seismic. The likelihood of a given scenario is tested by quantifying the misfit between the modeled versus the real seismic. This workflow illustrates the relevance of forward-modeling approaches for building realistic models that can be shared by the various disciplines of carbonate exploration (sedimentology, stratigraphy, diagenesis, seismic, geomodeling, and reservoir).
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Rijsdijk, K. F., S. Passchier, H. J. T. Weerts, C. Laban, R. J. W. van Leeuwen e J. H. J. Ebbing. "Revised Upper Cenozoic stratigraphy of the Dutch sector of the North Sea Basin: towards an integrated lithostratigraphic, seismostratigraphic and allostratigraphic approach". Netherlands Journal of Geosciences 84, n. 2 (luglio 2005): 129–46. http://dx.doi.org/10.1017/s0016774600023015.
Testo completoAbstract (sommario):
AbstractA revised Upper Cenozoic stratigraphic framework of the Dutch sector of the North Sea Basin is presented whereby offshore stratigraphic units are integrated or correlated with onshore units. The framework is based on an integrated stratigraphic approach that combines elements of lithostratigraphy, seismostratigraphy and allostratigraphy. Offshore formations are redefined in terms of seismofacies and lithofacies associations, and are differentiated on the basis of common genesis and stratigraphic position. These facies associations represent five major depositional environments, which occur in repetitive successions in the subsurface of the Netherlands: Marine, Coastal, Glacial, Fluvial, and Local Terrestrial. Five conceptual basin-wide bounding discontinuities are identified in the North Sea-Basin that span land and sea. They are represented by both seismostratigraphic and lithostratigraphic unconformities and interpreted as surfaces that formed as a result of North Sea Basin-wide changes in depositional systems. Their formation relates to sea level rise, continental-scale glaciations, and tectonic processes. The bounding discontinuities separate informal allostratigraphic groups of formations that have a grossly uniform geologic setting in common. While the allostratigraphic principles provide a view on the stratigraphy on the largest spatial and temporal scale, the genetic concept facilitates mapping on a local scale.
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Gonçalves, Pedro Wagner, Heitor Assis Junior, Marcelo Luis de Brino e Celso Dal Ré Carneiro. "Da Mineralogia à Geologia: quarenta anos que mudaram a ciência no Brasil (1876-1918)". História da Ciência e Ensino: construindo interfaces 27 (5 gennaio 2024): 124–41. http://dx.doi.org/10.23925/2178-2911.2023v27espp124-141.
Testo completoAbstract (sommario):
Resumo Esta pesquisa é resultado da reflexão sobre a história do mapeamento geológico do Brasil e a possibilidade de tratá-lo como caso de estudo. Pretende iluminar a intersecção entre a prospecção de recursos minerais (uma marca cultural desde a exploração praticada nos tempos do Brasil Colônia) e a preocupação pedagógica de difundir a Geologia entre elites culturais do final do século XIX, na Escola de Minas (fundada em 1876) e nas politécnicas. Os trabalhos pioneiros de John Casper Branner (1850-1922) e seus contatos com naturalistas que atuavam no Brasil, constituem chaves para interpretar seu significado e alcance em termos de descobertas (estabelecimento de marcos estratigráficos de extensão nacional), prospecção de recursos minerais estratégicos (ferro e carvão) e mudança do fazer ciência. Obras seminais publicadas por Branner (livro de texto intitulado Geologia Elementar – edições de 1906 e 1915 – e mapa geológico do Brasil – escala 1:5.000.000 publicado em inglês e português em 1919) exibem uma concepção de ciência, de geologia e de ensino marcantes na estruturação das ciências geológicas no Brasil. A reunião de preocupações pedagógicas e técnicas revela a inflexão dos estudos mineralógicos para geológicos no fim do século XIX e a emergência de um fazer geologia resultante de preocupações teóricas e práticas. Palavras-chave: História da Ciência, Ensino de Geologia, mapa geológico, livro didático, John Casper Branner (1850-1922) Abstract This study is the findings on the history of geologic mapping of Brazil and the alternatives of the case for teaching. It intends to highlight the intersection between prospection of mineral resources (a cultural character from Brazil colonia exploration) and the pedagogic worries to divulgate the geology among Brazilian cultural elites in ends of nineteenth century by means of School of Mines (created in 1876) and polytechnic schools. The strategic point to study is on the John Casper Branner's works (particularly his textbook – first and second editions, 1906 and 1915, and his geological map of Brazil, 1:5.000.000, published in English and Portuguese in 1919) because they show up the views of science, of geology and teaching; we defend that they present a framework of the geological sciences in Brazil. This framework reveals a network of naturalists, their contributions and their findings in terms of stratigraphic geology, mineral prospection, deposits and ores of iron and coal as well as the change of making geology. They put the stratigraphic marks to national geology, Branner synthetizes this making upon teaching perspectives. Branner's works (textbook and geological map) display a conception of science, of geology and the teaching which are fundamentals to organize Brazilian geological sciences. The combination of pedagogical and technical concerns reveals the inflection of mineralogical to geological studies in the ends of nineteenth century and the emergence of the making of geology because of theoretical and practical concerns. Keywords: history of science, teaching of geology, geological map, textbook, John Casper Branner (1850-1922) Resumen Este estudio recoge los hallazgos sobre la historia del mapeamiento geológica de Brasil y las alternativas del caso para la enseñanza. Pretende resaltar la intersección entre la prospección de recursos minerales (que viene desde la exploración colonial brasileña) y las preocupaciones pedagógicas por divulgar la geología entre las elites culturales brasileñas de finales del siglo XIX (cuando fue criada la Escuela de Minas, en 1876). El punto estratégico a estudiar son las obras de John Casper Branner (particularmente su libro de texto – primera y segunda ediciones, 1906 y 1915, y su mapa geológico de Brasil, 1:5.000.000, publicado en inglés y portugués en 1919) porque muestran cómo la ciencia y la geología se mesclan por medio de la enseñanza. Las ciencias geológicas en Brasil tuvieran un marco: una red de naturalistas, sus contribuciones y sus hallazgos en términos de geología estratigráfica, prospección minera, yacimientos y menas de hierro y carbón, así como el cambio de la geología. Branner sintetiza esta elaboración en perspectivas científicas y docentes. Sus obras (libro de texto y mapa geológico) muestran una concepción de la ciencia, de la geología y de la enseñanza que son fundamentales para organizar las ciencias geológicas brasileñas. La combinación de preocupaciones pedagógicas y técnicas revela la inflexión de los estudios mineralógicos en los geológicos a finales del siglo XIX y el surgimiento de la creación de la geología debido a preocupaciones teóricas y prácticas. Palavras-clave: historia de la ciencia, enseñanza de la geología, mapa geológico, libro de texto, John Casper Branner (1850-1922)
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Boreham, Steve, e Karolina Leszczynska. "The Geology of the Middle Cam Valley, Cambridgeshire, UK". Quaternary 2, n. 3 (12 luglio 2019): 24. http://dx.doi.org/10.3390/quat2030024.
Testo completoAbstract (sommario):
This study offers a new understanding of the stratigraphy and context of the Pleistocene (including Elsterian and Weichselian) and Holocene deposits of the Middle Cam valley, Cambridgeshire, United Kingdom, and provides a unique and detailed view of the sediment architecture of these valley-fill and interfluve sediments. The new insights into the geology of the area, including dating, pollen analyses, and sediment architecture, are presented with reference to a series of nine cross-sections through Holocene and Pleistocene deposits, as well as Cretaceous bedrock across the region. The structural geology of the bedrock and the stratigraphic arrangement of younger deposits are used to explain the landscape evolution of the area.
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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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Aalto, K. R. "Philip Tyson's 1849 study of California gold prospects". Earth Sciences History 36, n. 1 (1 gennaio 2017): 30–40. http://dx.doi.org/10.17704/1944-6178-36.1.30.
Testo completoAbstract (sommario):
Philip Thomas Tyson (1799–1877) toured privately through central California, from San Francisco through the Sierra Nevada foothills gold prospects in 1849, to assess their potential and the general geology of the region. He produced the first regional map with geologic notations and several rough topographic/geologic cross-sections. He described Coast Range basement rocks, now described as Franciscan Complex mélange and broken formation, the stratigraphic configuration of the Great Valley, and general geology of the Sierra Nevada foothills. He recognized that the older Coast Range and Sierran basement were deformed prior to recent volcanism and extensive terrestrial fluvial sedimentation, likely Neogene in age.
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Abd, Omnia, e Najah Abd. "Seismic Sequence Stratigraphic Model and Hydrocarbon Potential of Yamama Formation in Al-Fao Area, Southeastern Iraq". Iraqi Geological Journal 57, n. 1A (31 gennaio 2024): 56–69. http://dx.doi.org/10.46717/igj.57.1a.6ms-2024-1-17.
Testo completoAbstract (sommario):
One key step when interpreting seismic reflection data is sequence stratigraphy, which has improved with well logs and seismic data. By analyzing the different layers of sediment and rock, we can better understand the geologic history of an area and make more accurate predictions for hydrocarbon exploration. The current research focuses on interpreting seismic lines from the 2D seismic surveys conducted in the Al-Fao area and data from wells in the Siba gas field to construct a stratigraphic model within the Yamama Formation, to identify hydrocarbon traps and determine the most promising zones for hydrocarbon exploration. Yamama Formation is divided into two main units representing transgressive and regressive facies deposited in highstand system tract. Six seismic facies were identified (wavy, mound shape, oblique parallel, sigmoid, chaotic, and parallel), which reflected the deposition of Yamama Formation in a ramp setting with a gentle slope. Instantaneous phase attribute was utilized, which focused on the lateral changes of seismic facies and provided detailed information about the architecture of Yamama Formation depositional basin. The results of the seismic attributes analysis included identifying carbonate buildups and progradation stacking patterns with the presence of direct hydrocarbon indicator. Three main seismic stratigraphic indexes representing potential stratigraphic traps have been identified. These three stratigraphic features reflect the facies of shoal carbonate sediments in the last depositional cycle of Yamama Formation (Highstand). The stratigraphic model showed the best image of the depositional environment of Yamama Formation that corresponds with the seismic data interpretation and identifies the promising hydrocarbon traps.
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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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Visher, Glenn S. "Stratigraphic sequences". Leading Edge 22, n. 12 (dicembre 2003): 1212–17. http://dx.doi.org/10.1190/1.1641373.
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FULLER, J. G. C. M. "The invention and first use of stratigraphic cross-sections by John Strachey, F.R.S., (1671–1743)". Archives of Natural History 19, n. 1 (febbraio 1992): 69–90. http://dx.doi.org/10.3366/anh.1992.19.1.69.
Testo completoAbstract (sommario):
Stratigraphic cross-sections, or horizontally extended representations of strata in profile, were introduced into scientific literature in the year 1719 by John Strachey, of Sutton Court, near Stowey Somersetshire, England. Before that time, English-language stratigraphical geology had been practised chiefly by drillers searching for coal, whose published records of vertical sequences of strata and of lateral correlations among subsurface borehole sections, go back to 1639. Strachey's sections were new in several ways: they were drawings rather than lists of strata, they represented true dips, and most importantly they demonstrated stratigraphic correlation in the subsurface and across landscape gaps, where for structural or topographic reasons the intervening strata were obscured or missing. To achieve such delineations in the form of drawings or “draughts”, Strachey assumed as selfevident that the strata were regular in their order of superposition and that they had lateral continuity through concealed areas. His published observations and measurements were widely copied, and William Smith, generally regarded as one of the fathers of geology, seems to have found significant inspiration among Strachey's writings.
22
Yousif, Samir, e Ghalib Nouman. "Jurassic Geology of Kuwait". GeoArabia 2, n. 1 (1 gennaio 1997): 91–110. http://dx.doi.org/10.2113/geoarabia020191.
Testo completoAbstract (sommario):
ABSTRACT Until the late 1970s only one well penetrated the entire Jurassic section of Kuwait. A few other scattered wells partially penetrated it. During the 1980s an appreciable number of deep wells revealed that the Jurassic sequence is inverted with respect to the Cretaceous sequence and that the main Cretaceous arches were sites of Jurassic sedimentary troughs. This new interpretation marks a revolution in the existing concepts for Jurassic oil exploration in Kuwait. One of the most effective methods for defining of Jurassic structures is the isopach of the Upper Jurassic Gotnia Formation. The main Jurassic reservoirs include the Najmah, Sargelu and Marrat formations which were detected as a result of the exploration activities during the 1980s. Selective stratigraphic and structural cross-sections reveal the stratigraphic relationships of the Jurassic sediments.
23
Roux, Rosanne M. "Ship Shoal Block 91 field, offshore Louisiana: Discovery and development of a stratigraphic field". GEOPHYSICS 52, n. 11 (novembre 1987): 1466–72. http://dx.doi.org/10.1190/1.1442264.
Testo completoAbstract (sommario):
The Ship Shoal 91 field is a subtle stratigraphic play which consists of a seismic amplitude whose updip limits do not fit structure. The amplitude corresponds to both gas and oil in the Upper Miocene sand. To attempt to predict pay sand distribution accurately, several geologic models were defined as development drilling progressed. The models utilized self‐potential curve shape, core, and seismic character analyses, combined with computer modeling studies, engineering data, and scanning electron microscope studies. Four geologic models evolved, ranging from a structural trap formed by small faults, to a stratigraphic pinchout of the pay sand, to a channel sand, and finally to a complex channel sand, resulting in the current model: a faulted stratigraphic trap. The development strategy for determining well locations also evolved, due to unexpected well results. The initial strategy was based on the presence of seismic amplitudes, until it became apparent that the amplitude alone is not a reliable hydrocarbon indicator. The revised strategy is based on complex attribute analysis, including the amplitude envelope and the weighted frequency. The discovery and development of this stratigraphic field required thorough integration of geology, geophysics, and engineering disciplines. The Ship Shoal 91 field demonstrates that complex stratigraphic fields are still of exploration interest and can be successfully developed by using an integrated approach.
24
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.
25
Alsop, G. I. "The geometry and structural evolution of a crustal-scale Caledonian fold complex: the Ballybofey Nappe, northwest Ireland". Geological Magazine 131, n. 4 (luglio 1994): 519–37. http://dx.doi.org/10.1017/s0016756800012139.
Testo completoAbstract (sommario):
AbstractThe gross geometries exhibited by crustal-scale fold nappes are considered a consequence of both original stratigraphic relationships associated with sub-basin configuration, coupled with the nature of the structural regime and tectonic processes involved in the generation of the nappe pile. The Neo-Proterozoic Dalradian metasediments of northwestern Ireland provide a well-constrained and correlatable stratigraphy which defines a sequence of sub-reclined, tight-isoclinal Caledonian (c. 460 Ma) fold nappes. Within this fold complex, the dominant structure is the crustal-scale Ballybofey Nappe, which may be traced for 40 km along strike and is responsible for a regional (500 km2) stratigraphie inversion. The gentle, NE-plunging attitude of this fold results in a complete spectrum of tectonic levels and deformation gradients being exposed. Relatively low strains in the upper fold limb gradually increase down through the nappe, resulting in the generation of composite foliations and lineations and the development of a 10 km thick shear zone which culminates in a high strain basal detachment with underlying pre-Caledonian basement. The Ballybofey Nappe nucleated and propagated along a major zone of lateral sedimentary facies variation, coincident with the margin of a major Dalradian sub-basin. The large amplitude of the nappe is strongly influenced by the lateral heterogeneity within the metasedimentary sequence, and is associated with a minimum of 25–30 km ESE-directed translation concentrated within the overturned limb. Additional significant displacement is also focused along the basal décollement. Generation of the nappe complex resulted in significant crustal thickening and amphibolite facies metamorphism consistent with 15–18 km of burial, induced by a sequence of nappes propagating in the direction of overshear. The ESE-directed translation of the major fold nappes is away from the Caledonian foreland and a gravity-driven mechanism of nappe emplacement is suggested. Rigorous structural analysis within the cohesive stratigraphie framework enables relationships between the tectonic evolution and stratigraphic patterns to be distinguished, thus allowing models of fold nappe generation and mid-crustal deformation to be evaluated.
26
Carraro, Davide, Dario Ventra e Andrea Moscariello. "Anatomy of a fluvial paleo-fan: sedimentological and architectural trends of the Paleocene–Eocene Wasatch–Colton System (western Uinta Basin, Utah, U.S.A.)". Journal of Sedimentary Research 93, n. 6 (30 giugno 2023): 370–412. http://dx.doi.org/10.2110/jsr.2022.095.
Testo completoAbstract (sommario):
ABSTRACT Recent developments in fluvial geomorphology and sedimentology suggest that fluvial fans (also known as distributive fluvial systems) could be responsible for the accumulation of great volumes of clastic successions in continental basins. A general depositional model based on sedimentological and architectural trends has been formulated for these fluvial systems, however, their recognition in the stratigraphic record often relies on partially preserved, discontinuous successions. This study provides a sedimentological and architectural characterization of Paleogene alluvial strata of the Wasatch and Colton formations in the southwestern Uinta Basin, central Utah (U.S.A.), following an ∼ 120-km-long outcrop belt which records deposition from an alluvial wedge that prograded to the north and northwest, from the basin margin to distal lake-dominated environments, preceding the onset of ancient Lake Uinta. Lateral and vertical distribution of facies associations are presented from a dataset of field observations (thirteen logged stratigraphic sections, for a total of ∼ 2400 m) and virtual outcrop models along the proximal-to-distal extent of the Wasatch–Colton alluvial system. Four sectors are defined (proximal, medial, distal, and terminal) to mark the longitudinal heterogeneity of alluvial stratigraphy. Noteworthy trends comprise a downstream decrease in the overall thickness of the alluvial stratigraphic column, a reduction in the relative volume, architectural complexity, and amalgamation of fluvial-channel bodies away from the apex, a weak downstream-fining trend in channel sandstones, and a down-system increase in preserved overbank and floodplain deposits accompanied by increasing volume and facies complexity of preserved lacustrine and palustrine facies associations. A proximal-to-distal change in fluvial-channel architecture is noted, with proximal sections characterized by vertically and laterally amalgamated sheet-like channel fills, transitioning to a lesser degree of amalgamation towards the medial sector, whereas distal and terminal sections are dominated by floodplain fines enveloping a subordinate volume of isolated, ribbon-shaped channel-sandstone bodies. The temporal development of the stratigraphic succession is observed in its entirety throughout the field area and, albeit localized, channel-scale erosion and potential depositional hiatuses punctuate the stratigraphy. Two major system-scale trends have been described in the Wasatch–Colton System (WCS). A first-order, long-term progradational trend, especially evident in proximal and medial sections, encompasses the large-scale vertical patterns in facies and architecture vertically through most of the stratigraphy of the WCS. In contrast, the uppermost part of the stratigraphic succession is characterized by a reverse, retrogradational trend, possibly associated with the early transgression of Lake Uinta's southern margin, marking the base of the overlying Green River Formation. Albeit expressed by different vertical succession of facies, proximal-to-distal processes, and stratal patterns documented along a longitudinal transect of the WCS mirror substantially identical vertical trends through the stratigraphy, which are interpreted as Waltherian superposition of distinct depositional domains during fluvial-fan progradation. Analyses of sandstone petrography and zircon geochronology suggest a unified source for the fluvial system, also supporting an interpretation as a distributive, rather than a tributive, fluvial system. This study enhances our understanding of the current depositional model for extensive fluvial-fan successions via a regional-scale stratigraphic analysis of a fluvial paleo-fan based on integrated characterization of both vertical and down-system patterns in facies distribution and fluvial architecture, providing key insights on useful criteria for recognizing fluvial-fan successions from the rock record.
27
Long, Joshua H., Till J. J. Hanebuth e Thomas Lüdmann. "The Quaternary stratigraphic architecture of a low-accommodation, passive-margin continental shelf (Santee Delta region, South Carolina, U.S.A.)". Journal of Sedimentary Research 90, n. 11 (30 novembre 2020): 1549–71. http://dx.doi.org/10.2110/jsr.2020.006.
Testo completoAbstract (sommario):
ABSTRACT The Quaternary stratigraphy of the continental shelf offshore of South Carolina consists of stratigraphic units deposited in coastal-plain, shallow marine, and shelfal environments bounded by composite erosional surfaces that developed in response to numerous glacioeustatic cycles and were overprinted by regional uplift. These units are commonly distributed laterally, rather than stacked vertically, a function of the long-term low shelf gradient and the resulting lack of accommodation. Additionally, marine processes such as waves and geostrophic currents can rework both relict and modern sediments across the continental shelf. This study integrates high-resolution geological and geophysical datasets acquired offshore and onshore with existing data onshore into a comprehensive conceptual model describing the Quaternary geologic evolution of the coastal plain and continental shelf within a study area of approximately 8,000 km2. We use seismic facies and core analysis to define stratigraphic units associated with transgressive, regressive, and lowstand systems offshore. Regressive systems include progradational wave- and river-dominated deltaic and shoreface deposits. Lowstand systems consist of a complex network of paleo-incisions produced by regional, Piedmont-draining fluvial systems and smaller coastal plain rivers. Transgressive systems include paleochannel-fill successions dominated by mud-rich, tidally influenced backbarrier deposits, cuspate and linear shelf sand ridges, and transgressive sand sheets and shoals. The low-accommodation setting of the continental shelf influences the stratigraphic record in several ways: 1) the geometry of progradational coastal lithosomes, 2) the development of composite allogenic erosional surfaces, 3) the deposition of widespread, thin transgressive sand sheets, and 4) the restriction of thicker transgressive deposits to paleo-incisions. In this setting, the use of a bounding surface scheme that is hierarchical is preferable to the more common sequence stratigraphic or allostratigraphic convention for several reasons: 1) major erosional bounding surfaces are commonly amalgamated; 2) lower-order surfaces capture internal variability, which is key to the genetic interpretation of stratigraphic units, and 3) stratal stacking patterns typically used to define a sequence stratigraphic framework are rare.
28
Konradi, P. "Cenozoic stratigraphy in the Danish North Sea Basin". Netherlands Journal of Geosciences 84, n. 2 (luglio 2005): 109–11. http://dx.doi.org/10.1017/s001677460002299x.
Testo completoAbstract (sommario):
AbstractThis paper provides a concise review of investigations into the Cenozoic stratigraphy of the Danish North Sea Basin. In the Danish North Sea, mainly Pliocene and Pleistocene strata are found. Results of published seismic and sequence stratigraphic analyses are combined with biostratigraphic analyses and correlated to marine formations found onshore.
29
Boreham, S. "The Geology of the Wicken Vision Area, lower Cam valley, Cambridgeshire, UK". Netherlands Journal of Geosciences - Geologie en Mijnbouw 92, n. 1 (aprile 2013): 47–59. http://dx.doi.org/10.1017/s0016774600000275.
Testo completoAbstract (sommario):
AbstractThe geology of the Wicken Vision Area in the lower Cam valley is described with reference to a stacked series of ten cross-sections through Holocene and Pleistocene deposits, and Cretaceous/Jurassic bedrock across the region. A detailed cross-section through a Holocene palaeochannel, with radiocarbon dating and pollen analyses is also presented. The structural geology of the bedrock and the stratigraphic arrangement of the Pleistocene and Holocene deposits are used to describe landscape development for the area. This study offers a new understanding of the stratigraphy and context of the Holocene, Weichselian and earlier Pleistocene deposits of the lower Cam valley, and provides a unique view of sediment architecture in valley-fill sediments at the fen edge.
30
Grabowski, Jacek, Jozef Michalík, Andrzej Pszczółkowski e Otília Lintnerová. "Magneto-, and isotope stratigraphy around the Jurassic/Cretaceous boundary in the Vysoká Unit (Malé Karpaty Mountains, Slovakia): correlations and tectonic implications". Geologica Carpathica 61, n. 4 (1 agosto 2010): 309–26. http://dx.doi.org/10.2478/v10096-010-0018-z.
Testo completoAbstract (sommario):
Magneto-, and isotope stratigraphy around the Jurassic/Cretaceous boundary in the Vysoká Unit (Malé Karpaty Mountains, Slovakia): correlations and tectonic implications Magneto- and isotope stratigraphic studies in the Vysoká Nappe (Hlboča section, Fatric Unit, Malé Karpaty Mts, Slovakia) were performed. A generally decreasing δ13C isotope curve is interpreted as a primary trend from the Late Oxfordian (3.3 ‰ V-PDB) to the Late Tithonian (1.8-1.4 ‰ V-PDB). Data from the Tithonian part of the Tegernsee Formation probably reflect "local" basin processes connected with the breccia formation in the latest Tithonian/earliest Berriasian and/or with possible diagenetic overprint. The C-isotope record of the Berriasian Padlá Voda Formation is more homogeneous (1.4-1.8 ‰ V-PDB) and assumed to be primary. Magnetostratigraphic investigations were focused on the Jurassic/Cretaceous (J/K) boundary strata. Upper Tithonian nodular limestones of the Tegernsee Formation differ substantially from Lower Berriasian calpionellid limestones of the Padlá Voda Formation in rock magnetic properties. Hematite is present in the Tegernsee Formation, while magnetite is the only magnetic mineral of the Padlá Voda Formation. Additionally, the latter formation contains superparamagnetic magnetite, which significantly influences its magnetic susceptibility. Correlation of normal and reversed magnetic intervals with the Late Tithonian global polarity time scale was supported by microfossil stratigraphy. M21n to M20n magnetozones were distinguished, including the short reversed Kysuca (M20n1r) Subzone within M20n. Interpretation of Lower Berriasian magnetostratigraphy was more complex due to presence of breccia horizons and a stratigraphic gap at the J/K boundary in the lower part of the Padlá Voda Formation embracing M19r and most of M19n magnetozones. This formation was also partially affected by remagnetization. Detailed correlation between the isotope- and magnetic stratigraphy of the Tithonian-Berriasian interval between Hlboča and Brodno sections is also complex due to J/K stratigraphical gap within the Hlboča section. The primary B component accounts for counter-clockwise rotation of the Vysoká Unit with a magnitude of ca. 50°. Since the paleodeclination of Paleogene and Karpatian-Eggenburgian rocks in the area is similar, the rotation must have taken place after Early Miocene. The paleoinclinations of several Upper Tithonian-Berriasian sections of the Central Western Carpathians and western part of the Pieniny Klippen Belt are consistent and indicate paleolatitude of 27-30°N.
31
Qu, Quan Gong, e Feng Yun Zhu. "Study on Stratigraphy Correlation of EPC Oilfield in Mexico". Advanced Materials Research 1073-1076 (dicembre 2014): 2252–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.2252.
Testo completoAbstract (sommario):
Stratigraphy correlation is the basis of study on oilfield reservoir characterization. According to region study results, marine environments correlation pattern were used in EPC Oilfield, stratigraphic sequence were summarized, based on the feature of lithology and responding of core data and wired logging data, correlation markers were summarized in each sequence, formation distribution were described based on the zonation, geology model were summarized for the main oil bearing formation. Following study on reservoir were based on these results.
32
Schroot, B. M. "Structural development of the Dutch Central Graben". Danmarks Geologiske Undersøgelse Serie B 16 (31 dicembre 1991): 32–35. http://dx.doi.org/10.34194/serieb.v16.7090.
Testo completoAbstract (sommario):
After Heybroek (1975) described the structure of the Dutch Central North Sea Graben and NAM and RGD (1980) published a stratigraphic nomenclature of the Netherlands containing a stratigraphic model for the Jurassic sediments, further work continued, both within the industry and the Geological Survey. Because Herngreen and Wong (1989) set up a revised stratigraphy for the Late Jurassic of the Central Graben and neighbouring areas, it was felt necessary to have a closer look at the structural geology of the Central Graben and to review its hydrocarbon potential. The results of this study have been reported by Wong et al. (1989). This work just about coincided with an increased interest of the industry in the south-eastern extension of the Graben because of the Dutch seventh round of exploration licenses.
33
Michelsen, Olaf. "Stratigraphic correlation of the Danish onshore and offshore Tertiary successions based on sequence stratigraphy". Bulletin of the Geological Society of Denmark 41 (30 novembre 1994): 145–61. http://dx.doi.org/10.37570/bgsd-1995-41-14.
Testo completoAbstract (sommario):
The results of a sequence stratigraphic study of the Tertiary sedimentary succession in the Danish North Sea sector, and the adjacent parts of the Norwegian, German, and Dutch sectors are reviewed in the present paper. Lithology and thickness variations of seven major sequence stratigraphic units, comprising twentyone sequences, are shortly described. The chronostratigraphic and genetic relationships between the North Sea sequences and the Danish onshore lithostratigraphic formations are emphasized. Six major sequence stratigraphic boundaries are pointed out, being time-equivalent with regional unconformities in the onshore area. The six surfaces bound five sedimentary packages, which are isochronous in their recognized lateral extension, and comprise genetically related deposits. It is suggested to define the five units as allostratigraphic units, and thus to create a stratigraphic subdivision, which is mappable in the southeastern North Sea region, possibly in the main part of the North Sea. The five allostratigraphic units can be identified in all areas by the available data; seismic sections and logs in the offshore area, and lithology in onshore outcrops and shallow wells. The definition of an allostratigraphic scheme would create a common nomenclature across the national borders and the present coastlines, and hopefully increase the accuracy of the chronostratigraphic correlation between profiles in the North Sea region.
34
Mattner, Joerg, e Moujahed Al-Husseini. "Essay: applied cyclo-stratigraphy for the Middle East E&P industry". GeoArabia 7, n. 4 (1 ottobre 2002): 734–44. http://dx.doi.org/10.2113/geoarabia0704734.
Testo completoAbstract (sommario):
Summary The modeling of ordered sedimentary cycles through orbital forcing (cyclo-stratigraphy) could impact the Middle East E&P industry practices from regional exploration to reservoir engineering. The correlation of longer period cycles could detect thinning or disappearing reservoir intervals over structures. These terminations may be due to erosion or non-deposition, and used to guide exploration for stratigraphic traps. The correlation of shorter period cycles may be used to map the disappearance or diagenetic alteration of reservoir flow units between wells. The Permian and Mesozoic carbonates and evaporites that constitute the main Middle East hydrocarbon reservoirs and seals, manifest cycles at many scales, and are particularly suited for cyclo-stratigraphic analysis.
35
Zhemchugova, Valentina A., Vadim V. Rybalchenko e Tatiana A. Shardanova. "Sequence-stratigraphic model of the West Siberia Lower Cretaceous". Georesursy 23, n. 2 (25 maggio 2021): 179–91. http://dx.doi.org/10.18599/grs.2021.2.18.
Testo completoAbstract (sommario):
Apparently, conceptual base of the sequence stratigraphy is one of the most acknowledged methodologies in the geological world at the present time for the sedimentary strata structure prediction. It is based on the complex analysis of the seismic, stratigraphic and sedimentary data on the depositional bodies where the structure and facies filling is regulated by the relative sea level changes. The Lower Cretaceous section of the Western Siberia in this regard is the unique object, as it is represented by the full range of the clastic depositional environments – from relatively deep-water to the continental, which are very sensitive to the conditions changes. Sequence-stratigraphic analysis results can be used to complete the pragmatic tasks in the petroleum geology as the analysis is based on the reconstruction of the sedimentogenesis processes in the past, and the understanding of that processes is the key to the generalized depositional model development. This model can be used to create the models, which can be applied to the unique local objects that occur in the Lower Cretaceous section.
36
Tipper, John C. "Estimating Stratigraphic Completeness". Journal of Geology 95, n. 5 (settembre 1987): 710–15. http://dx.doi.org/10.1086/629166.
Testo completo
37
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.
38
Lin, Wen, David Kynaston, Curtis Ferron, Janok P. Bhattacharya e William Matthews. "Depositional and sequence stratigraphic model of transgressive shelf sandstone: The Late Cretaceous Tocito Sandstone, San Juan Bain, New Mexico, U.S.A." Journal of Sedimentary Research 91, n. 4 (1 aprile 2021): 415–32. http://dx.doi.org/10.2110/jsr.2020.121.
Testo completoAbstract (sommario):
ABSTRACT There has long been debate about the origin of long, linear, isolated shallow marine sandstones. In the 1980s these were routinely interpreted as wave- or tide-modulated shelf sandstones. With the advent of sequence stratigraphy, many of these sandstones were reinterpreted as top-truncated forced-regressive to lowstand delta or shoreface, inviting the question regarding whether the concept of a shelf sandstones remain a viable depositional model. More recent syntheses demonstrate that shelf sands tend to be derived by reworking of underlying sediment through transgressive erosion and show varying levels of detachment and reworking into discrete ridges and bars by wave and tidal processes as they become more evolved. The Late Cretaceous Tocito Sandstone in the Western Interior Seaway, which overlies the regressive Gallup Formation, is a candidate for a transgressive shelf sandstone. In this study, we present detailed facies analysis, based on sedimentological sections measured from well-exposed outcrops of the Tocito Sandstone and its related stratigraphic units in northwest New Mexico, USA. With high-resolution sequence stratigraphic control, facies analysis, detrital-zircon anatomy, and petrographic analysis are integrated to investigate the sequence stratigraphic evolution and depositional processes of the Tocito Sandstone. Detrital zircons indicate that the Tocito, Torrivio, and Gallup deposits are derived from different source areas, and therefore imply separate sequence stratigraphic origins. The Tocito Sandstone is interpreted to have been deposited as shelf sand ridges in retrogradational estuarine to drowned-barrier-system environments with tidal and wave influence, characterized by intense bioturbation. The Tocito was deposited in an overall transgressive systems tract and sourced from reworking of the underlying Torrivio and Gallup units through processes of transgressive erosion.
39
Matthews, Robley K., e Moujahed I. Al-Husseini. "Orbital-forcing glacio-eustasy: A sequence-stratigraphic time scale". GeoArabia 15, n. 3 (1 luglio 2010): 155–67. http://dx.doi.org/10.2113/geoarabia1503155.
Testo completoAbstract (sommario):
ABSTRACT This essay provides further explanation of the mathematical details of orbital forcing and glacio-eustatic modeling (Parametric Forward Modeling, PFM) aspects and applications. A slight tune-up of the Earth’s eccentricity calculations (LA04 of Lasker et al., 2004) produces a near-perfect repeat of 14.58 million-year period and allows PFM to predict the glacio-eustatic component of sea-level fluctuation throughout the Phanerozoic. Generalities of an exploratory grid search of the parameter space of the model are reviewed and repetitive peak sea levels and low sea levels are noted in context of the Arabian Orbital Stratigraphy (AROS) terminology and time scale. Emphasis on the straton (405,000 year “tuning fork” of stratigraphic time) will lead to improvements in sequence-stratigraphic methods and results.
40
Branagan, D. F., e D. T. Moore. "W. H. Fitton's Geology of Australia's Coasts, 1826". Historical Records of Australian Science 19, n. 1 (2008): 1. http://dx.doi.org/10.1071/hr08001.
Testo completoAbstract (sommario):
In an appendix to Phillip Parker King's 1826 book Narrative of a Survey of the ... Coasts of Australia..., W. H. Fitton attempted, largely on the basis of the rock specimens collected on King's and earlier expeditions, to summarize the geological (mainly lithological) character of Australia's coastal regions. We have examined and identified the specimens, preserved in the Natural History Museum, London, in terms of modern concepts, indicating their stratigraphic affinities. Fitton realized the limitations of his work and, wishing to encourage better knowledge, appended 'Instructions for collecting geological specimens', stressing the need to understand not only the materials, but the order of formation. Fitton was indicating that a sense of stratigraphy was essential to the progress of geology. Despite its deficiencies, Fitton's paper was an important step towards understanding the geology of an almost unknown continent.
41
Gearon, James H., Cornel Olariu e Ronald J. Steel. "The supply-generated sequence: A unified sequence-stratigraphic model for closed lacustrine sedimentary basins with evidence from the Green River Formation, Uinta Basin, Utah, U.S.A." Journal of Sedimentary Research 92, n. 9 (20 settembre 2022): 813–35. http://dx.doi.org/10.2110/jsr.2021.096.
Testo completoAbstract (sommario):
Abstract Closed lakes and oceans are stratigraphically distinct systems. However, closed-lake stratigraphy is often interpreted using conventional sequence stratigraphic concepts which were generated for marine settings. As a consequence, lacustrine stratigraphy has long been vexing and applied on an ad-hoc basis. To remedy this, we present a novel, unified sequence stratigraphic model for hydrologically closed (endorheic) basins: the Supply-Generated Sequence (SGS) Model. This model was generated to interpret our outcrop-based correlation—the largest to date at ∼ 30 km—across the Sunnyside Interval member of the middle Green River Formation in Nine Mile Canyon near Price, Utah, USA. The SGS model is based on the fundamental sedimentological and hydrodynamic differences between closed lakes and marine settings wherein the relationship between water discharge and sediment discharge is highly correlated. The SGS model divides packages of genetic lacustrine strata by bounding correlative surfaces, conformable or unconformable, separating facies and surfaces associated with low clastic supply (e.g., carbonates, mudstones, or exposure surfaces) from facies characteristic of relatively higher amounts of clastic supply (subaerial channelized sandstones, subaqueous siltstones, and pedogenic mudstones). We use the SGS model to correlate regional sequences at a higher resolution than previous interpretations and find the greatest amount of clastic deposition occurs during periods of lake-level rise, indicating that the SGSs are characteristically transgressive. Additionally, this model removes the implicit and explicit base-level assumptions of previous sequence stratigraphic models while being agnostic to the source of increased sediment discharge and therefore generalizable to other closed lacustrine settings. We use the high-resolution supply-generated sequences (meters thick) to argue for a climatic origin of the cyclic Sunnyside interval deposits based on sequence durations (40–50 kyr), and aligning sequences with recognized early Eocene transitory hyperthermal event timing and their associated climatic shifts across the region, increasing riverine discharge of sediment and water.
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Matthews, Robley K., e Cliff Frohlich. "Maximum flooding surfaces and sequence boundaries: comparisons between observations and orbital forcing in the Cretaceous and Jurassic (65-190 Ma)". GeoArabia 7, n. 3 (1 luglio 2002): 503–38. http://dx.doi.org/10.2113/geoarabia0703503.
Testo completoAbstract (sommario):
ABSTRACT We have undertaken a simplified calculation of orbital forcing back through the Cretaceous to the Late to Middle Jurassic from 65 to 190 Ma. So long as the Earth has a continental ice volume, orbital forcing will impose a 400-ky periodicity upon glacioeustasy and thereby on fourth-order sequence stratigraphy cycles. Similarly, third-order cycles were defined by orbital forcing of 2.4 ± 0.4 my (predominately 2.0- and 2.8-my cycles). These concepts greatly simplified the task of unraveling sequence stratigraphy. Our sea-level calculations are comparable with stratigraphic observations and the results are consistent with a persistent continental ice volume throughout the Late to Middle Jurassic and Cretaceous. In general, they compare well with the Arabian Plate Maximum Flooding Surfaces and the Cretaceous and Jurassic stage boundaries, within the limits of the recognized stratigraphic time scales. We used simple Parametric Forward Models (PFMs) for modeling changes in sea level, subsidence, and sedimentation and noted that PFMs can be applied to other tasks. The results will provide for rapid, cost-effective forward modeling on tasks such as reservoir characterization and flow simulation.
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Nikitenko, B. L., V. P. Devyatov, E. B. Pestchevitskaya, A. Yu Popov, E. A. Fursenko e S. N. Khafaeva. "Stratigraphy, Lithology, and Geochemistry of Coastal and Shallow-Sea Sections of the Uppermost Middle Jurassic–the Lowermost Cretaceous Section in the Anabar River Region (Arctic Siberia)". Russian Geology and Geophysics 63, n. 5 (1 maggio 2022): 558–89. http://dx.doi.org/10.2113/rgg20204262.
Testo completoAbstract (sommario):
Abstract —Concepts of the stratigraphy of the coastal and shallow-sea sections of the uppermost Middle Jurassic and Lower Cretaceous, exposed on the right bank of the Anabar River, have radically changed many times. The performed study and analysis of the published data are aimed at refining the bio- and lithostratigraphic subdivision of the section, substantiating its stratigraphic completeness, and describing the identified stratigraphic units in detail. Comprehensive biostratigraphic studies of the uppermost Bathonian — the lowermost Boreal Berriasian reveal a sequence of nine biostratigraphic units with dinocysts and palynoflora in the ranks of zones and local zones. Some of the palynological biostratigraphic units have been identified for the first time. Foraminiferal assemblages of the boreal standard zones are recorded in the sections under study. The obtained biostratigraphic data and analysis of all known ammonite occurrences make it possible to demonstrate the stratigraphic continuity of the section in the Anabar River region, despite the reduced thickness of the stratigraphic units. The stratigraphic position of the boundary between the Sodiemykha and Buolkalakh formations is accurately defined. According to the interpretation proposed, the basal horizon of the Buolkalakh Formation is associated with a beginning of a new major sedimentation stage in the late Oxfordian–early Kimmeridgian, identified as the lower boundary of lithostratigraphic units of different ranks throughout the entire Arctic Region and partially in the Boreal Region. The lithogeochemical parameters of the studied formations are obtained for the first time. The content of Corg in the studied samples does not exceed its Clarke values, and the pyrolytic parameter Tmax indicates that the organic matter is immature and the petroleum potential is low. The considered organic matter of the rocks is characterized by a heavy isotope composition of carbon, suggesting its mostly terrigenous genesis.
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Zolnikov, I. D., A. V. Shpansky e M. V. Mikharevich. "PROBLEMS OF THE QUATERNARY STRATIGRAPHY OF THE SIBERIAN REGION". Geology and mineral resources of Siberia, n. 10s (dicembre 2021): 3–6. http://dx.doi.org/10.20403/2078-0575-2021-10c-3-6.
Testo completoAbstract (sommario):
This special issue of the journal is devoted to modern controversial subjects arising during the research of the Siberian Quaternary system. The initiative to discuss these problems and new factual material that requires rethinking outdated stratigraphic constructions belonged to the section of the Quaternary system of SIBRMSK and was supported by leading experts actively working in the region. It should be noted that this issue does not cover all the unresolved issues on the geology, stratigraphy and paleogeography of the Quaternary period of Siberia.
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Philip, Jean M., Jack Roger, Denis Vaslet, Fabrizio Cecca, Silvia Gardin e Abdullah M. S. Memesh. "Sequence stratigraphy, biostratigraphy and paleontology of the Maastrichtian-Paleocene Aruma Formation in outcrop in Saudi Arabia". GeoArabia 7, n. 4 (1 ottobre 2002): 699–718. http://dx.doi.org/10.2113/geoarabia0704699.
Testo completoAbstract (sommario):
ABSTRACT The Aruma Formation is a predominantly carbonate lithostratigraphic unit of Late Cretaceous age that crops out in Saudi Arabia. It consists of three members: from base to top they are Khanasir Limestone Member, Hajajah Limestone Member, and Lina Shale Member. In order to establish a stratigraphic revision of the Formation, a reference section near Al Kharj, southeast of Riyadh in central Saudi Arabia, was logged and a hierarchical organization of the depositional sequences established. The Aruma corresponds to four third-order cycles bounded by erosional unconformities. Integrated biostratigraphical data mainly based on ammonites, nannoflora, rudists, and larger foraminifera point to a Maastrichtian age for the Khanasir and Hajajah members, and a Paleocene age for the Lina Member. Regional stratigraphic correlations were established within the outcropping Aruma Formation in Saudi Arabia. Biostratigraphy and sequence stratigraphy allowed a correlation framework to be proposed between the Aruma and the Qahlah and Simsima formations of the United Arab Emirates and the Oman Mountains, and with the Sharwayn Formation of the Hadramawt and Dhofar. The high-resolution stratigraphic scheme established for the Aruma Formation in Saudi Arabia is expected to be useful for subsurface correlations and in petroleum exploration.
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Shestopalov, Vyacheslav M., Oleksandr M. Ponomarenko e Stella B. Shekhunova. "IN MEMORIAM OF PROFESSOR PETRO F. GOZHIK, ACADEMICIAN OF THE NATIONAL ACADEMY OF SCIENCES OF UKRAINE". Collection of Scientific Works of the Institute of Geological Sciences of the NAS of Ukraine 14, n. 1 (20 maggio 2021): 5–16. http://dx.doi.org/10.30836/igs.2522-9753.2021.232269.
Testo completoAbstract (sommario):
This article is devoted to the blessed memory of Petro F. Gozhik, prominent Ukrainian scientist in the fields of paleontology, stratigraphy, marine geology, Winner of the State Prizes of Ukraine in Science and Technology (1989, 2000), Merited Figure of Science and Technology of Ukraine (1997), Laureate of NAS Tutkovsky Prize (2008), Director of the Institute of Geological Sciences of the NAS of Ukraine (1997–2020), President of the Paleontological Society of Ukraine, Chairman of the National Stratigraphic Committee of Ukraine, initiator and the first Director of the National Antarctic Research Center (previously the Center for Antarctic Research of the NAS of Ukraine), Doctor of Geological and Mineralogical Sciences (1993), Professor (2008), Academician of the NAS of Ukraine (2006). Scientific interests of P. F. Gozhik were diverse, but, first he was an outstanding paleontologist and stratigrapher, Quaternary geologist, a renowned researcher of the Neogene — Quaternary fossil freshwater mollusks of the south of Eastern Europe. His works in Quaternary stratigraphy, paleogeography and the geological history of continental Ukraine and the Black Sea, the study of Quaternary mollusks, continental (alluvial, glacial, water-glacial, loess) and estuarine sediments became tabletop reference books.
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Dub, S. A. "Neoproterozoic Deposits of the Bashkir Mega-Anticlinorium (Southern Urals): State of the Art in Regional Stratigraphy". Russian Geology and Geophysics 62, n. 11 (1 novembre 2021): 1240–55. http://dx.doi.org/10.2113/rgg20204205.
Testo completoAbstract (sommario):
Abstract —This paper presents an alternative variant of stratigraphic subdivision of the upper Riphean–Vendian deposits (approximately corresponding to the Neoproterozoic Erathem of the International Chronostratigraphic Chart (ICC)) of the Bashkir Mega-Anticlinorium (BMA), based on the modern concepts of changes in the biosphere, atmosphere, and hydrosphere (and, accordingly, in the climate and the course of sedimentary processes) in the period ~1000–540 Ma, with regard to the results of recent studies and the proposals for improving the Russian General Stratigraphic Scale (GSS) of the Precambrian. The strict necessity of subdividing chronostratigraphic and lithostratigraphic units is shown. The presented data give grounds to regard the Zil’merdak Formation as a Group and assign three of its lower formations to the Middle Riphean (Yurmatinian). It is shown that the period of accumulation of the Karatau Group (comprising the Katav, Inzer, Min’yar, and Uk formations) was significantly shorter than the duration of the Late Riphean (Karatavian). Special attention is focused on the age of the Uk Formation (analysis of the existing data made it possible to refine its stratigraphic position): It formed, most likely, in the period 780–740 Ma. A high uncertainty of the stratigraphic position of the overlying geologic bodies is demonstrated. The Bakeevo, Tolparovo, Suirovo, and Kurgashla formations must be regarded as part of the Terminal Riphean (Arshinian). The Arsha Group, comprising the Bainas, Makhmutovo, Igonino, and Shum formations in the Tirlyan trough and represented by the Krivaya Luka Formation in the Krivaya Luka syncline, should not be totally assigned to the Terminal Riphean. It is proposed to exclude the Bakeevo Formation and the Tolparovo–Suirovo sequence from the Asha Group, because these deposits are, most likely, a modification of the Arsha Group located on the western flank of the BMA. The Uryuk Formation is probably of pre-Vendian age. The current contradictory data on the stratigraphy of the supra-Uryuk unit of the Asha Group are interpreted. The ages of the geologic bodies composing the Group and its stratigraphic interval still call for a thorough study.
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Tipper, J. C. "Techniques for quantitative stratigraphic correlation: a review and annotated bibliography". Geological Magazine 125, n. 5 (settembre 1988): 475–94. http://dx.doi.org/10.1017/s0016756800013224.
Testo completoAbstract (sommario):
AbstractThe development of techniques for quantitative stratigraphic correlation has tended to outstrip their acceptance by practising stratigraphers. To make these techniques more readily accessible and to encourage their use, this paper presents a brief, general review of the problem of quantitative stratigraphic correlation and then shows how, using a natural framework for stratigraphic correlation, the stratigraphic time-series, there can be seen an orderly pattern among them. The annotated bibliography, of almost 400 articles, includes a majority of those references concerned with quantitative stratigraphic correlation, in whatever sense: the scheme of annotation provides a straightforward, albeit subjective indication of the general thrust of each article.
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Al-Husseini, Moujahed, e Robley K. Matthews. "STRATIGRAPHIC NOTE: Jurassic-Cretaceous Arabian orbital stratigraphy: The AROS-JK Chart". GeoArabia 13, n. 1 (1 gennaio 2008): 89–94. http://dx.doi.org/10.2113/geoarabia130189.
Testo completo
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Somali, Fuad, e Yasin Charles El-Taha. "Geophysicists meet in Muscat to discuss advancements in land geophysical acquisition technologies". Leading Edge 39, n. 6 (giugno 2020): 434–35. http://dx.doi.org/10.1190/tle39060434.1.
Testo completoAbstract (sommario):
In recent years, technological advancements have paved the way to acquire seismic data in innovative ways. Adopting these technologies led to increased trace densities and increased data volume. In the past, conventional acquisition with low trace densities and limited offset and azimuth distribution served well to image simple geologic targets. This led to the discovery of currently producing fields. However, exploration strategies have changed by focusing on more complex geology (e.g., unconventional reservoirs and stratigraphic traps). High density and broadband acquisition are therefore essential to map subtle and complex targets. Advancements in equipment manufacturing and survey design have made this possible.