Littérature scientifique sur le sujet « Fluides – Provenance »
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Articles de revues sur le sujet "Fluides – Provenance"
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Calandra, Sara, Emma Cantisani, Silvia Vettori, Marilena Ricci, Beatrice Agostini et Carlo Alberto Garzonio. « The San Giovanni Baptistery in Florence (Italy) : Assessment of the State of Conservation of Surfaces and Characterization of Stone Materials ». Applied Sciences 12, no 8 (16 avril 2022) : 4050. http://dx.doi.org/10.3390/app12084050.
Texte intégralRésumé :
During the last restoration campaign of the Baptistery of San Giovanni in Florence (Italy), the assessment of the state of conservation of external surfaces was performed, with a multi-analytical approach, in order to support the conservation and restoration treatments. Black crusts, red staining, sulphation, and organic patinas were identified. Moreover, a complete characterization of marble cladding, bricks, and mortars was carried out. A geochemical and minero-petrographic approach was used in order to classify and assess the provenance of marbles, and define raw materials and technologies of the production for bricks and mortars. Provenances from Italy (Carrara and Lasa marbles) and from Greece (Hymettus and Pentelicum marbles) were identified and attributed to different construction phases, restoration interventions, and re-use of ancient materials. For mortars, the obtained data suggested the use of local materials and traditional technologies for the production. Overall, two different minero-petrographic typologies were identified for the analyzed bricks.
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Tang, Deyou, Rong Zhao, Yuebang Lin, Tangqing Zhang et Pingjian Zhang. « Modeling the Data Provenance of Relational Databases Supporting Full-Featured SQL and Procedural Languages ». Applied Sciences 13, no 1 (21 décembre 2022) : 64. http://dx.doi.org/10.3390/app13010064.
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Data provenance is information about where data come from (provenance data) and how they transform (provenance transformation). Data provenance is widely used to evaluate data quality, trace errors, audit data, and understand references among data. Current studies on data provenance in relational database management systems (RDBMS) still have limitations in supporting full-featured SQL or procedural languages. With these challenges in mind, we present a formal definition of provenance data and provenance transformation for relational data. Then, we propose a solution to support data provenance in relational databases, including provenance graphs and provenance routes. Our method not only solves the complicated problem of modeling provenance in DBMS but also is capable of extending procedural languages in SQL. We also present ProvPg, a PostgreSQL-based prototype database system supporting data provenance in multiple granularities. ProvPg implements extraction, calculation, query, and visualization of provenance. We perform TPC-H tests for ProvPg and PostgreSQL, respectively. Experimental results show that ProvPg addresses the vision of supporting data provenance with little extra computation overhead for the execution engine, which indicates that our model is applicable to lineage tracing applications.
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Boose, Jörg, Andreas Schmidt Mumm et Uwe Giese. « Petrographic, cathodoluminescence and fluid inclusion studies as provenance indicators of Early Palaeozoic sediments of Rügen, Germany ». Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 222, no 1-2 (26 septembre 2001) : 193–214. http://dx.doi.org/10.1127/njgpa/222/2001/193.
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Ye, Qian, et Minyan Lu. « s2p : Provenance Research for Stream Processing System ». Applied Sciences 11, no 12 (15 juin 2021) : 5523. http://dx.doi.org/10.3390/app11125523.
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The main purpose of our provenance research for DSP (distributed stream processing) systems is to analyze abnormal results. Provenance for these systems is not nontrivial because of the ephemerality of stream data and instant data processing mode in modern DSP systems. Challenges include but are not limited to an optimization solution for avoiding excessive runtime overhead, reducing provenance-related data storage, and providing it in an easy-to-use fashion. Without any prior knowledge about which kinds of data may finally lead to the abnormal, we have to track all transformations in detail, which potentially causes hard system burden. This paper proposes s2p (Stream Process Provenance), which mainly consists of online provenance and offline provenance, to provide fine- and coarse-grained provenance in different precision. We base our design of s2p on the fact that, for a mature online DSP system, the abnormal results are rare, and the results that require a detailed analysis are even rarer. We also consider state transition in our provenance explanation. We implement s2p on Apache Flink named as s2p-flink and conduct three experiments to evaluate its scalability, efficiency, and overhead from end-to-end cost, throughput, and space overhead. Our evaluation shows that s2p-flink incurs a 13% to 32% cost overhead, 11% to 24% decline in throughput, and few additional space costs in the online provenance phase. Experiments also demonstrates the s2p-flink can scale well. A case study is presented to demonstrate the feasibility of the whole s2p solution.
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Xu, Tao, Ling Feng, Wen Yin, Jinpeng Wei, Yarong Wang et Xianli Zou. « Element Geochemical Characteristics and Provenance Conditions of the 1st Member of Jurassic Zhongjiangou Formation in Wudun Sag, Dunhuang Basin ». Applied Sciences 12, no 9 (20 avril 2022) : 4110. http://dx.doi.org/10.3390/app12094110.
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In order to clarify the provenance of the 1st member of the Zhongjiangou formation in Wudun sag, Dunhuang basin, the structural attributes, weathering and sedimentary characteristics of the provenance area were analyzed by means of element geochemistry, so as to determine the differences of sediment sources in different well areas. The results show that the higher the Al2O3 and K2O contents, the higher the enrichment of large ion lithophile elements and high field strength elements, while the iron and magnesium elements are relatively deficient, and there are characteristics of medium degree differentiation of light and heavy rare earth elements in Well XC1 and Well D2. The lower the Al2O3 content and the higher the SiO2 content, a loss of large ion lithophile elements and high field strength elements are observed, while the ferrophilic magnesium elements show serious loss, as shown in the characteristics of the high degree of differentiation of light and heavy rare earth elements in Well D1. In the UCC-normalized element spidergrams, the trend of Well XC1 and Well D2 is similar, which is different from that of well D1, indicating that the sediments of Well XC1 and Well D2 come from the same provenance area, while the sediment of Well D1 comes from a different provenance area. The provenance area of Well XC1 and Well D2 shows strong tectonic activity and strong weathering, while the provenance area of well D1 exhibits relatively weak tectonic activity and weathering. Combined with previous research results, Wudun sag is mainly characterized by a faulted lacustrine basin controlled by the southern boundary fault in the Jurassic layer. Therefore, the sediments of Well XC1 and Well D2 mainly come from the southern Sanweishan uplift provenance area, with strong tectonic activity; the sediments of Well D1 mainly come from the northern Beishan provenance area, with relatively weak tectonic activity.
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Kan, Wenguang, Zailin Yang, Liangliang Yu et Menghan Sun. « Provenance and Tectonic Setting of Formation of Quaternary Sedimentary Successions from the Songhua River, Northeast China ». Applied Sciences 12, no 15 (22 juillet 2022) : 7356. http://dx.doi.org/10.3390/app12157356.
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Drilling has been conducted to investigate the petrogeochemistry of the Late Pleistocene Guxiangtun Formation and Holocene Wenquanhe Formation in Northeast China. Both Guxiangtun and Wenquanhe Formations are fluvial facies, which are composed mainly of quartz and feldspar, with minor mica and clay minerals. To understand the provenance and tectonic setting of these sediments, geochemical analyses of fifteen selected samples from the drill core have been carried out. Compared to the composition of the upper continental crust (UCC), the sediments exhibit higher SiO2, similar TiO2 and K2O, and lower Fe2O3, MgO, MnO, CaO, and Na2O contents. The bivariant plot of Th/Sc versus Zr/Sc ratios indicates the contribution from recycled sedimentary provenance for our studied sediments; furthermore, the low to medium degree of weathering of these sediments is commonly indicated by the chemical index of alteration (CIA) of 52. The discriminant function diagram using major elements shows a mixed provenance of the sediments, including quartzose sedimentary and felsic igneous rocks. According to the Fe2O3+MgO vs. K2O/Na2O plot and Th–Sc–Zr/10 diagram, the sediments under the investigation fall mostly within the active continent margin field.
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Ao, Cong, Xue-Ming Teng, Xue-Bin Wei, Tao Lei, Duo Wang et Jun Yang. « Geochemistry of Mudstones/Silty Mudstones from the Qigequan Formation and Shizigou Formation in Yuejin-II Area, Southwestern Area of the Qaidam Basin : Implications for Sedimentary Environment and Sandstone-Type Uranium Mineralization ». Minerals 12, no 5 (23 mai 2022) : 658. http://dx.doi.org/10.3390/min12050658.
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The Qaidam Basin has been the focus of sandstone-type uranium prospecting since the 1950s. In recent years, relying on the uranium geological survey project supported by the China Geological Survey, and the cooperation with the Qinhai oil company, drilling work at the Yuejin-II area in this basin has achieved breakthroughs on industrial-level sandstone-type uranium exploration. In this study, we present major, trace and REE geochemical analysis of the Qigequan Formation and the Shizigou Formation mudstones/silty mudstones collected from an industrial uranium ore drillholes in the Yuejin-II area. The Shizigou and Qigequan Formations exhibit signatures of non-intense alteration, low rock maturity and proximal provenance. The overall arid paleoclimatic conditions controlled the sedimentation of large volume of uranium rich materials. The period of relative humidity prompted the sedimentation of reduced agents. Aided by the neotectonic-induced slopes and tectonic windows, oxygenated fluids migrated along permeable layers and extracted the hexavalent uranium, transported in the form of uranyl ion (UO22+). When the oxygen–uranium-rich fluids finally infiltrated into the reductive sand body, the hexavalent uranium was reduced to tetravalent uranium and deposited in the form of uranium compounds. Large-scale and centrally distributed reductive sand bodies provided favorable ore storage space for the sandstone-type uranium mineralization in the Yuejin-II area.
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Men, Yekai, Ende Wang, Jianfei Fu, Sanshi Jia, Xinwei You et Qiangwen He. « Geology and geochemistry of the Yuanjiacun banded iron formation in Shanxi Province, China : constraints on the genesis ». Geological Magazine 156, no 11 (15 avril 2019) : 1839–62. http://dx.doi.org/10.1017/s0016756819000219.
Texte intégralRésumé :
AbstractThe Yuanjiacun banded iron formation (BIF) is hosted in lower Proterozoic metamorphic strata, and its structures are dominated by bands or streaks. Based on their differences in mineral compositions, the iron ores can be subdivided into haematite quartzite, magnetite quartzite, stilpnomelane magnetite quartzite and stilpnomelane haematite quartzite. The geochemical characteristics of the surrounding rocks show that the protoliths consisted of argillaceous and arenaceous sedimentary rocks. The predominant provenance was a high-maturity felsic sedimentary terrane. The absence of syn-depositional igneous rocks and the tectonic setting discrimination diagrams indicate that the Yuanjiacun BIF formed in a passive continental margin setting. Negligible terrigenous materials were involved in the precipitation of the Yuanjiacun BIF. The precipitation of the Yuanjiacun BIF was predominantly controlled by the mixing of seawater and hydrothermal fluids. Its metallogenic material originated from the leaching of mafic oceanic crust by hydrothermal fluids. The observed Ce anomaly deficiency and heavy Fe isotope enrichment indicate that the Yuanjiacun BIF formed in an anoxic marine environment. In a redox-stratified palaeo-ocean, the Yuanjiacun BIF formed in reducing seawater below the oxidation–reduction transition zone. The Si and O isotope compositions of quartz suggest that the formation of the Yuanjiacun BIF was closely related to submarine hydrothermal activity. The Si and Fe erupted from the seafloor and precipitated by supersaturation and biological oxidation under anoxic conditions, respectively.
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Yan, Zhaobin, Hongjie Ji, Guolin Guo, Fei Xia, Wenwen Zhang, Saisai Song et Shaofang Liu. « Geochemical Characteristics of Trace Elements and REEs and their Geological Significance for Uranium Mineralization within the Qianjiadian Sandstone-Hosted Uranium Deposit, Songliao Basin ». Geofluids 2023 (20 avril 2023) : 1–16. http://dx.doi.org/10.1155/2023/6297033.
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The Qianjiadian uranium deposit is a typical interstratified oxidized zone sandstone-hosted uranium deposit hosted in the Upper Cretaceous Yaojia Formation of the southern Songliao Basin. Despite its significance, little research has been conducted on the relationship between trace elements, REEs, and uranium mineralization in this deposit. This study presents new geochemical data from sandstones in the oxidation, transition, and reduction zones. The sandstones in the transition zone are highly enriched in U and moderately enriched in Mo, Cd, and V compared to those in the oxidation and reduction zones. They are also weakly enriched in Co, Ni, and Zn. The oxidation and transition zone sandstones have higher ∑LREE and ∑HREE contents than those in the reduction zone. However, the oxidation zone sandstones are characterized by LREE enrichment and flat HRRE distribution, while the transition zone sandstones show HRRE enrichment and flat LREE distribution. These trace element and REE differentiation characteristics within each subzone are closely related to the geological process of interstratified oxygenation. Oxygenated uranium-bearing fluids from southwestern provenance areas carried multiple trace elements and REEs and infiltrated along the oxidation sandstones to reach the Yaojia Formation’s transition zone. During this process, a certain amount of Mo, V, Cd, and LREE from the oxygenated ore-forming fluids was precipitated by Fe-Mn hydroxide adsorption or calcite and siderite cementation. Meanwhile, about 20.33% of preexisting U in the oxidation zone sandstones was continuously extracted and entered into the oxygenated ore-forming fluids. In the transition zone, where dissolved oxygen was exhausted and hydrocarbons were continuously injected, U, Mo, Cd, V, Co, Ni, Zn, and REEs were unloaded and precipitated as uranium minerals, sulfide minerals, or carbonate minerals. The enrichment of Mo, Cd, V, and HREEs in the sandstones can serve as new prospecting indicators for the Qianjiadian uranium deposit.
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Li, Jing, Peng Wu, Guanghua Yang, Lei Pan, Xinguo Zhuang, Xavier Querol, Natalia Moreno, Baoqing Li et Yunfei Shangguan. « Enrichment of Li–Ga–Zr–Hf and Se–Mo–Cr–V–As–Pb Assemblages in the No. 11 Superhigh Organic Sulfur Coal from the Sangshuping Coal Mine, Weibei Coalfield, Shaanxi, North China ». Energies 13, no 24 (17 décembre 2020) : 6660. http://dx.doi.org/10.3390/en13246660.
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Superhigh organic sulfur(SHOS) coals have currently attracted great attention due to their typical depositional environments and formation history as well as their great negative impact on the ecosystem. This study investigated the geochemistry of the No. 11coalof the Late Carboniferous Taiyuan Formation from the Sangshuping coalmine, Hancheng miningarea, Weibei coalfield, Shaanxi, North China. The No. 11 coal is a high-sulfur coal with a large proportion of organic sulfur content (3.7 to 5.5%, avg. 4.4%) and belongs to typical SHOS coal. The high sulfur content in the Sangshuping coal mine has been mainly caused by the combined influences of seawater and hydrothermal fluids. The SHOS in No. 11 coal was formed in the Fe-poor and S-rich high-marine influenced occlusive environment. During the late coalification stage, a high proportion of pyritic sulfur was formed due to sufficient Fe supply from the Fe–S-rich epigenetic hydrothermal fluids. The No. 11 SHOS coal is enriched in Li–Ga–Zr–Hf and Se–Mo–Cr–V–As–Pb element assemblages. The sediment provenance of the Sangshuping coal mine is predominantly felsic–intermediate rocks from both the Yinshan and Qinling Oldland. However, the elevated concentrations of critical elements (Li, Ga, Zr, and Hf) in the No. 11 coal are primarily inherited from the Yinshan Oldland. The enrichment of the Se–Mo–Cr–V–As–Pb assemblage in No. 11 coal can be ascribed to the influence of both seawater and epigenetic hydrothermal activity.
Thèses sur le sujet "Fluides – Provenance"
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Blythe, Lara S. « Understanding Crustal Volatiles : Provenance, Processes and Implications ». Doctoral thesis, Uppsala universitet, Berggrundsgeologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-171486.
Texte intégralRésumé :
Knowledge of the provenance of crustal volatiles and the processes by which they are released is extremely important for the dynamics of magmatic systems. Presented here are the results of multiple investigations, which aim to understand magmatic volatile contamination from contrasting but complementary perspectives. The main methodologies used include He and C isotope values and CO2/3He ratios of volcanic gases and fluids; simulation of magma-carbonate interaction using high-pressure high-temperature experimental petrology; X-ray microtomography of vesiculated xenoliths and computer modeling. Findings show that the contribution from upper crustal volatiles can be substantial, and is dependant on the upper crustal lithology on which a volcano lies, as well as the composition of the magma supplied. Carbonate dissolution in particular is strongly controlled by the viscosity of the host magma. The details of the breakdown of vesiculated xenoliths is complex but has wide reaching implications, ranging from the dissemination of crustally derived materials through a magma body to highlighting that crustal volatiles are largely unaccounted for in both individual volcano and global volatile budgets. In synthesizing the conclusions from each of the individual perspectives presented, I propose the contribution of volatiles from crustal sources to play a significant role in many geological systems. This volatile component should be taken into consideration in future research efforts.
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Aydi, Souad. « Procédés d'oxydation dydrothermale pour le traitement des résidus provenant des huileries (margines) ». Bordeaux 1, 2007. http://www.theses.fr/2007BOR13360.
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Les margines sont des effluents liquides issus de la production d'huiles d'olive, caractérisées par la présence d'une quantité importante de polyphénols. Les margines ont un impact négatif sur le milieu naturel et présentent notamment un danger pour les réserves d'eau et la production d'eau potable. L'oxydation hydrothermale est un procédé innovant qui permet de traiter les margines. L'objectif de ce travail est de déterminer les paramètres cinétiques et thermodynamiques nécessaires pour dimensionner une installation industrielle pour le traitement de ce type de déchet. Dans un premier temps, les margines ont été traitées dans un réacteur fonctionnant en mode fermé pour évaluer les conditions opératoires optimales pour le traitement des margines. Dans un deuxième temps, des essais ont été réalisés dans un réacteur tubulaire fonctionnant en mode continu afin de déterminer les grandeurs cinétiques et les grandeurs thermodynamiques du procédé. Dans un troisième temps, sur la base des données cinétiques et thermodynamiques obtenues, nous avons validé et utilisé le logiciel de génie des procédés, Prosim Plus, pour simuler le procédé d'oxydation hydrothermale. Nous avons dimensionné, grâce à ce logiciel, une installation industrielle de 1 m3/h pour le traitement des margines.
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Vial, Laurence. « Ecoulements dans des modèles des voies aériennes proximales provenant de l' imagerie médicale ». Paris 6, 2005. http://www.theses.fr/2005PA066556.
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Călin, Laur Florentin. « Séparation électrostatique des matériaux plastiques provenant d'équipements informatiques en utilisant la triboélectrisation en lit fluidisé ». Poitiers, 2008. http://www.theses.fr/2008POIT2279.
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Les déchets d’équipements informatiques sont composés d’une grande diversité de matériaux plastiques dont le recyclage nécessite la recherche et le développement de nouvelles technologies de séparation physique. L’objectif de ce travail a été de mettre au point un procédé utilisant l’effet triboélectrique pour assurer la charge des granules de plastique et les forces du champ électrique pour les séparer. Après une brève présentation des phénomènes physiques en jeu, nous décrivons les deux dispositifs à lit fluidisé et les deux séparateurs électrostatiques que nous avons conçus et construits. Ceux-ci nous ont permis d’abord l’étude des facteurs influents du processus de charge triboélectrique en lit fluidisé de certains matériaux plastiques granulaires (PVC, PET, ABS, PS), en utilisant la méthode des plans d’expériences. La problématique de l’optimisation de la charge acquise dans les dispositifs à lit fluidisé par des mélanges binaires de matériaux granulaires a été abordée ensuite, en utilisant la même méthodologie. L’influence de l’humidité et de la température de l’air de fluidisation sur l’efficacité de la charge a été quantifiée par l’étude de la déviation des granules en champ éléctrique. Nous proposons un modèle numérique des trajectoires des granules chargés dans le champ électrostatique d’un séparateur à chute libre. Ce modèle a été validé par des essais réalisés avec plusieurs mélanges de matériaux plastiques (ABS, ABS-PC et HIPS). Les résultats expérimentaux confirment la charge triboélectrique en lit fluidisé suivi de la séparation en champ électrostatique comme procédé efficace de traitement de déchets d’équipements informatiquesThis work aimed at elaborating a process using triboelectrisation for charging plastic granules and electric field forces to separate them. After an introduction to the state of the, the author describes the two fluidised bed tribocharging devices and the two electrostatic separators that he built. The factors that influence the tribocharging of certain granular plastics (PVC, PET, ABS, PS) i. E. Duration of charging process, particle size, nature of the surfaces in contact, were evaluated using the design of experiments method. The influence of ambient temperature and humidity on charging binary mixtures of plastics was investigated using the same methodology. A numerical model of charged particle trajectories has been validated by experiments performed on granular mixtures of ABS, ABS-PC and HIPS. The experimental results confirm that tribocharging in a fluidised bed followed by electrostatic separation is an effective process for informatics equipment waste treatment
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Carter, Samantha Cassie. « Improving our understanding of the marine barium cycle and constructing a new archive of erosion and sediment transport ». The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593602009469204.
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Brettell, Rhea C., Janet Montgomery et J. A. Evans. « Brewing and stewing : the effect of culturally mediated behaviour on the oxygen isotope composition of ingested fluids and the implications for human provenance studies ». 2012. http://hdl.handle.net/10454/5804.
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No'Small beer', 'wort drinks' and 'pottage' may have been regularly consumed by children during the Medieval Period. This culturally mediated behaviour could have affected the oxygen isotope composition of their water intake beyond that which is accommodated in the current conversion equations used in archaeological studies to assess environmental origins. Experimental data shows that brewing may increase the δ18O value of ale by 1.3‰ over that of the initial water ('liquor') used, boiling water to make hot drinks raises the δ18O value of the fluid consumed by ~0.4‰ and slow-cooking using a large stew pot results in an increase in the oxygen isotope composition of the 'pottage' by an average of 10.2‰ after 3 hours of cooking. Thus, if ingested fluids included 20% from ale, 10% from 'teas' and 20% from stews (the latter increased from -7.0‰ to +3.2‰ by three hours of cooking) then the overall effect on the calculated drinking water value from the tooth enamel will be +2.3‰ .
NERC
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Klaus, Janina Simone. « Evaluation of 87Sr/86Sr, δ18O, δ2H, and Cation Contents as Geochemical Tracers for Provenance and Flow Paths of Saline Solutions in German Zechstein Deposits ». Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-B284-E.
Texte intégralChapitres de livres sur le sujet "Fluides – Provenance"
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Norman, Marc D. « The 187Re-187Os and 190Pt-186Os Radiogenic Isotope Systems : Techniques and Applications to Metallogenic Systems ». Dans Isotopes in Economic Geology, Metallogenesis and Exploration, 89–122. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_4.
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AbstractRhenium, Os, and Pt are redox sensitive elements that are concentrated in highly reducing environments such as those associated with black shales but mobile under more oxidizing conditions such as those associated with arc volcanism. They are chalcophile in many terrestrial ore-forming environments, and their isotopic systematics provide unique opportunities to date the formation of sulfide ore deposits and understand their petrogenesis. Fractional crystallization of magmatic sulfide ores generates primary variations in Re/Os and Pt/Os that allow mineral and whole rock isochron ages to be determined and discrimination of crustal and mantle sources based on initial Os isotopic compositions. Molybdenite is especially well suited for geochronology due to its high Re/Os and resistance to resetting. Rhenium concentrations in molybdenite tend to reflect the composition or provenance of the ore-forming fluids, with higher concentrations associated with more primitive sources or more oxidized fluids and lower concentrations with more evolved and/or reduced conditions, although local and regional factors also have a significant influence. Many studies have used pyrite for dating but its typically low Re concentration, variable initial Os isotopic composition (reflecting fluid mxing), and susceptibility to re-equilibration makes its use as a geochronometer problematic in many cases. Other sulfide minerals such as bornite and arsenopyrite have shown promise for Re–Os isotope geochronology but additional studies are needed to evaluate their broader applicability for dating of ore deposits. The isobaric beta decay of parent isotope 187Re to 187Os has restricted investigation of this system by microbeam techniques such as ion microprobe or laser ablation mass spectrometry, especially for geochronology. This requires either chemically processing the sample to separate the elements or novel techniques such as collision-cells that preferentially ionize the Re and Os during the analysis. Thermal ionization mass spectrometry (TIMS) and inductively-coupled plasma mass spectrometry (ICPMS) are the most widely applied techniques for Re-Pt-Os isotopic analyses. Specialized techniques for sample digestion to ensure redox equilibrium between Os in the sample and the isotopically enriched spikes used for isotope dilution measurements are typically required. This chapter briefly reviews development of the 187Re-187Os and 190Pt-186Os isotopic systems for earth science, physico-chemical controls on their behavior in ore-forming environments, and applications to metallogenic systems.
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Manera, Lorenzo. « Digital Objects’ Aesthetic Features. Virtuality and Fluid Materiality in the Aesthetic Education ». Dans Springer Series in Design and Innovation, 147–55. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-49811-4_14.
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AbstractThe growing and ubiquitous presence of digital objects raises issues of interest from the points of view of both Aesthetics and interaction design. In fact, such issues concern the perceptual dimension that defines our relationship with digital objects, the reconfiguration of the sensitive experience that their development implies, their hybrid ontological status, and their possible role in developing innovative forms of aesthetic education combined with design thinking.In the contemporary debate, digital objects are intended – on the one hand – as designed objects that incorporate and employ digital technologies [1–3].On the other hand, they are interpreted as virtual bodies, interactive digital images that become a phenomenon of the binary representation of an algorithm which interacts with a user [4]. Within the former perspectives, digital objects display a quality that broadly belongs to technical devices, meaning their openness to forms of interactivity, and their sensitivity to contingency. In the latter, the features of intermediacy and virtuality are considered the defining characteristics of digital objects. The growing complexity of digital objects is, in fact, re-defining the relationship between materiality and distance, provenance and pertinence, suggesting an interactive conception of agency that allows forms of aesthetic experience in which imagination, sensibility and intuitions can be displayed within relational structures. By showing the results of a research project focused on digital materials and their transformation, which involved children aged 8 to 11 years old, this contribution aims to discuss the possible role that such objects can play in developing new forms of aesthetic education.
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Sorensen, Sorena S., Virginia B. Sisson et Hans G. Avé Lallemant. « Geochemical evidence for possible trench provenance and fluid-rock histories, Cordillera de la Costa eclogite belt, Venezuela ». Dans Caribbean-South American plate interactions, Venezuela. Geological Society of America, 2005. http://dx.doi.org/10.1130/0-8137-2394-9.173.
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Ferraro, Thomas J. « No Forgiveness in Heaven, No Forgetting in Hell ». Dans Transgression and Redemption in American Fiction, 166–85. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198863052.003.0008.
Texte intégralRésumé :
Chapter 7 argues that the word which brings the “nasty, grim little tale” of Willa Cather’s The Professor’s House to the surface is “sin” and that the hermeneutic that makes sense of the Professor’s love-driven crisis of will is German-American Catholic. The starting point of this revisionist reading is non-controversial; The Professor’s House frames one great homosocial, alternatively domestic, putatively anti-capitalist intergenerational romance (Tom Outland’s reminiscences of his cowpoke buddy, Roddy Blake) inside another (Professor St. Peter’s idealization and idolization of Tom Outland), both of which seem to be as pure of heart—and of fluid exchange—as the pristine air and water of Outland’s Blue Mesa. But the women of the novel, especially wife Lillian and the two daughters, would seem to have a different story to tell, regarding the Professor’s investments in Outland and Outland’s retreat with Roddy and what male-male romance has in it for women—a subtext of feminist perspective and women’s values that emerges, in remarkable clarity, as if by miracle, from the fractured yet relentless Catholic insinuations of the novel: a veritable catechism of silent revelations and muted insistences beginning, in fact, with the reclamation of the discourse and provenance of sin. It comes as a surprise, then, that a novel as sophisticated in sociological inquiry, sexual wisdom, and experimental form as The Professor’s House—one of the most academically revered, or at least attended to, novels in the current modernist canon—can and does have a moral—indeed, it tests for morality.
Actes de conférences sur le sujet "Fluides – Provenance"
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Birkle, Dr Peter, et Hamdi A. AlRamadan. « Geochemical Techniques to Detect Sources of Fluids in Highly Pressured Casing-Casing Annuli CCA ». Dans Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208146-ms.
Texte intégralRésumé :
Abstract The buildup of high casing-casing annulus (CCA) pressure compromises the well integrity and can lead to serious incidents if left untreated. Potential sources of water causing the elevated CCA pressure are either trapped water in the cement column or water from a constant feeding source. This study utilizes inorganic geochemical techniques to determine the provenance of CCA produced water as trigger for high pressure in newly drilled wells. Affinities in the hydrochemical (major, minor and trace elements) and stable isotopic (δ2H, δ18O) composition are monitored to identify single fluid types, multi-component mixing and secondary fluid alteration processes. As a proof-of-concept, geochemical fingerprints of CCA produced water from three wells were correlated with potential source candidates, i.e., utilized drilling fluids (mud filtrate, supply water) from the target well site, Early - Late Cretaceous aquifers and Late Jurassic - Late Triassic formation waters from adjacent wells and fields. Geochemical affinities of CCA water with groundwater from an Early Cretaceous aquifer postulate the presence one single horizon for active water inflow. Non-reactive elements (Na, Cl) and environmental isotopes (δ2H, δ18O) were found to be most suited tools for fluid identification. 2H/1H and 18O/16O ratios of supply water and mud filtrate are close to global meteoric water composition, whereas formation waters are enriched in 18O. Elevated SO4 and K concentrations and extreme alkaline conditions for CCA water indicates the occurrence of minor secondary alteration processes, such the contact of inflowing groundwater with cement or fluid mixing with minor portions of KCl additives. The presented technology in this study enables the detection of high CCA pressure and fluid leakages sources, thereby allowing workover engineers to plan for potential remedial actions prior to moving the rig to the affected well; hence significantly reducing operational costs. Appropriate remedial solutions can be prompted for safe well abandonment as well as to resume operation at the earliest time.
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Birkle, Peter, Leyla Ismailova, Egor Tirikov, Waleed Saeed, Maram AlSaif et Mustafa Al Ibrahim. « Geochemical Artificial Intelligence Tool for Enhanced Water Management ». Dans SPE International Conference on Oilfield Chemistry. SPE, 2023. http://dx.doi.org/10.2118/213867-ms.
Texte intégralRésumé :
Abstract Produced water from crude oil and gas producing zones is geochemically heterogeneous due to the input from diverse underground sources and/or operation-related fluids. The present work targets developing and implementing an innovative numerical tool to automatically predict the type and provenance of recovered produced water from exploration and production. Machine learning-based tools was assessed for the automated classification of produced water types in oilfields with a differentiation of formation water from operation-related fluids. Multiple algorithms in machine learning were tested on hundreds of training and testing datasets of produced water samples to identify methods with the highest performance rates. A combination of the supervised XGBoost algorithm with semi-supervised self-training methods resulted in the two best-performing algorithms for all metrics (accuracy, precision, recall) with an accuracy above 90%. The developed software allows the automated recognition of representative formation water samples, and its differentiation from drilling or operation-related fluids, such as mud filtrate, completion brine, supply water, condensate water, and mixed water types. The algorithm was successfully tested for the classification of hundreds of produced water samples from different fields and reservoirs to define accurate formation water properties for several wells and lithological units. In general, the majority of produced water samples resulted in being post-testimonies from drilling, workover, and production-related activities. Enhanced water management by processed geochemical data can directly contribute to a potential reduction in drilling lost-time, well cleanup time, and reducing the risk of drilling dry holes. Additionally, well control can be optimized by identifying water inflow zones, and the amount of required bottomhole samples can be reduced by identifying nonrepresentative sampling intervals. Furthermore, geochemical fingerprinting of formation water as dominant reservoir fluid can provide analogous clues on the source rock, migration, trapping, and alteration of hydrocarbons.
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Al Hajri, Salim N., German Merletti, Peter Armitage, Khalil Al Rashdi, Ewan Gray et Sawsan Al Saadi. « Multi-Scale Reservoir Characterization of a Diagenetically Complex Tight-Gas Reservoir ; The Miqrat Formation, Oman ». Dans ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216390-ms.
Texte intégralRésumé :
Abstract The Miqrat Formation is a Cambrian tight-gas (low permeability) reservoir in the Khazzan and Ghazeer fields (Block 61), which together with the Barik Formation comprise the most prolific gas and condensate reservoirs in northern Oman. The reservoir quality of these sandstones is controlled by the depositional environment, ensuing diagenesis, timing of liquid hydrocarbon charge and subsequent replacement by gas and condensate. The development of the Miqrat is challenged by its geological complexity and this study demonstrates an integrated multi scale workflow to reduce risk and uncertainty in developing these reservoirs. The Miqrat was deposited in alluvial plain and lacustrine sedimentary environments. The environment and provenance formed a mineralogically and texturally variable sediment at deposition, which has been diagenetically modified and degraded during subsequent burial history (maximum burial depth exceeding 5km). Understanding the heterogeneity of these sandstones at a range of scales is crucial in understanding the key risk of reservoir deliverability. To address this, we have accomplished a comprehensive core analysis programme including Nuclear Magnetic Resonance (NMR), and thin section petrology to identify the complex diagenetic and sedimentological controls on reservoir quality and their relationship to bound and moveable fluids. These plug scale measurements are upscaled to log scale where emphasis is placed on reservoir permeability. Log-derived models include porosity- and rock type-based trends. Water saturation models include the verification of potential deep conductive mud-filtrate invasion using resistivity modeling workflows. Core-derived porosity and permeability plots show scattered, disguised trends demonstrating multiple competing controls on reservoir quality. Integration of post-hydraulic fracture clean up and flow tests provide additional evidence for larger scale reservoir complexity. Wells having similar log-derived gas absolute permeability thickness (KabsH) exhibit a wide range of initial reservoir performance. Core-calibrated, log-derived models are utilized to generate sand-thickness, pore thickness, absolute and gas effective permeability maps, to reveal the extent of the container, its space for fluids, and its lateral deliverability. Petrophysical maps are integrated to the understanding of hydraulic fracture propagation and well test results to further identify potential inter-well heterogeneity. This paper demonstrates an integrated multi-scale workflow that effectively reduces uncertainty in the prediction of initial gas production to de-risk development in a complex reservoir.