Marine and Petroleum Geology最新文献

{"title":"An innovative seismo-petrophysical characterization of a turbidite sand in the Nam Con Son Basin, using permeability-linked adaptive rock physics template (K-ARPT) with reference to gas exploration and carbon storage","authors":"Pham Huy Giao ,&nbsp;Doan Huy Hien ,&nbsp;Pham Hong Trang ,&nbsp;Pham Quy Ngoc ,&nbsp;Bui Viet Dung ,&nbsp;Ha Quang Man","doi":"10.1016/j.marpetgeo.2024.107263","DOIUrl":"10.1016/j.marpetgeo.2024.107263","url":null,"abstract":"<div><div>The MMF30 turbidite sand in the Hai Thach-Moc Tinh (HT-MT) field, Nam Con Son basin (NCSB), Vietnam, is a significant gas condensate-producing reservoir. However, the variable and high cementation make its reservoir characterization particularly challenging. With the declining production observed in many fields in the NCSB since 2018 one needs to think not only of exploring more hydrocarbon reservoirs, but also how to make use of depleted reservoirs for carbon storage in the near future.</div><div>In this study, we successfully conducted a comprehensive seismo-petrophysical characterization of a deep-seated, highly-cemented sand (MMF30) by integrating core testing, well log analysis, rock physical modeling and prestack seismic inversion. The predominant types of cementation of the study sand are quartz-overgrowth, clayey, and calcite, which altogether make a high percentage of up to 10%. The sand porosity was found to be from 11 to 17% and gas saturation from 50% up. An innovative contribution of this study is the successful proposal and construction of a new type of rock physics template named the permeability-linked adaptive rock physics template (K-ARPT) to help identify more in details the permeable subzones within the depleted gas reservoir. To construct K-ARPT, different permeability prediction models were tried, both traditional and machine learning-based, among which the random forest (RF) method proved to be the best for the study sand based on cross-validation with the available core measurements. As results of seismo-petrophysical characterization, five lithological units of shale and gas sand were identified in the MMF30 reservoir interval with porosity from 11 to 17%, gas saturation from 50% up and permeability from less than 0.5 to 50 mD, among which the unit of 20–50 mD would be the most suitable for carbon injection and storage.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107263"},"PeriodicalIF":3.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vegetation response to climatic evolution and environmental change during the Oligocene in the Bohai Bay Basin (eastern China): Implications of palynological and organic geochemical data","authors":"Shilin Wang ,&nbsp;Ahmed Mansour ,&nbsp;Cong Li ,&nbsp;Mohamed S. Ahmed ,&nbsp;Lingjian Meng ,&nbsp;Peidong Su ,&nbsp;Thomas Gentzis ,&nbsp;Seare Ocubalidet","doi":"10.1016/j.marpetgeo.2024.107257","DOIUrl":"10.1016/j.marpetgeo.2024.107257","url":null,"abstract":"<div><div>The Eocene-Oligocene transition was marked by a notable shift in global climate patterns, from greenhouse to icehouse conditions and continental aridification, consistent with a change in vegetation cover. Tectonic uplift and the collision between the Indian and Asian plates, as well as sea regression, were of the potential derivers of global climate changes. In the lacustrine Bohai Bay Basin, thick sequences of the siliciclastic Shahejie and Dongying formations were deposited during the Eocene-Oligocene. This study examines the Oligocene First Member (Es₁) of the Shahejie Formation and the Third Member (Ed₃) of the Dongying Formation from the NP3-20 well in the Nanpu Depression based on palynology, organic geochemistry, and mineralogical composition to reconstruct the paleoclimatic and paleoenvironmental conditions. Palynomorph composition reveals that the Es₁ and Ed₃ members are dominated by moderate to high abundances of gymnosperm and angiosperm pollen grains. Gymnosperms include mainly Pinaceae (<em>Pinuspollenites</em> and <em>Piceaepollenites</em>) and Podocarpaceae conifers (<em>Podocarpidites</em> and <em>Paleoconiferus</em>), which indicate cold-temperate conifer forests. Angiosperms, represented by Fagaceae (<em>Quercoidites</em>), Betulaceae (<em>Betulaepollenites</em>, <em>Alnipollenites</em>, and <em>Momipites</em>), Juglandaceae (<em>Juglanspollenites</em> and <em>Caryapollenites</em>), and Ulmaceae (<em>Ulmipollenites</em> and <em>Ulmoideipites</em>), suggest a broadleaved deciduous forest. These angiosperms together with fern spores reflect warm-temperate and humid climates typical of the lower vegetation belts in temperate and subtropical mountain ranges. Thus, the palynomorph content indicates that a mixed conifer and broadleaved deciduous forest was prevalent during deposition of the Oligocene Es₁ and Ed₃ members in the Nanpu Depression. This mixed forest is characterized by average annual temperatures of 2–8 °C and precipitation levels of 500–1000 mm, reflecting a temperate-warm and humid climate. Moderate acritarchs and rare dinoflagellate cysts suggest successive phases of marine incursions and increased hypersaline conditions during deposition of the Es₁ and Ed₃ members. Organic geochemical proxies, such as Pr/Ph, Pr/<em>n</em>C₁₇, and Ph/<em>n</em>C₁₈, provide further evidence of enhanced anoxia and increased marine organic matter input. The MPI and MPRs aromatic maturity parameters revealed that the Es₁ and Ed₃ members are thermally mature and reached the peak to late stages of the oil window. SARA analysis shows that most samples of the Es₁ and Ed₃ members rich in saturates, and the oils are normal paraffinic oils.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107257"},"PeriodicalIF":3.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel method for DCS reservoir modeling with consideration of oil-water relationships","authors":"Jingzhe Li ,&nbsp;Zhongchuang Wang ,&nbsp;Lingwen Xu ,&nbsp;Ming Wang ,&nbsp;Hanhan Yang ,&nbsp;Xiufan Zhang ,&nbsp;Yan Shi ,&nbsp;Zhifeng Sun","doi":"10.1016/j.marpetgeo.2024.107259","DOIUrl":"10.1016/j.marpetgeo.2024.107259","url":null,"abstract":"<div><div>Distributary Channel System (DCS) reservoirs play a crucial role in storing oil and gas, and several modeling methods are used to study them. Among these methods, magnetic random walk is a method with unique advantages and can achieve better results in some scenarios. However, current magnetic random walk models cannot effectively consider oil-water relationship information in wells, resulting in the potential “water above oil” contradiction. To address this problem, this article proposes a novel algorithm that considers oil-water relationships. This algorithm inherited the idea of the magnetic random walk. It not only considers the distinction between channel and non-channel wells, but also considers the distinction between oil and water properties within channel wells. To avoid potential oil-water contradictions, an oil-water contradiction avoidance mechanism is introduced. In a case study, the new algorithm indeed showed better performance, effectively overcoming potential oil-water contradiction problems. Compared to existing algorithms, the new algorithm incorporates more geological constraints (structural height information and oil-water properties information) and is an important step in improving the accuracy of well-interval predictions, which can provide important support for oil and gas development and has important application prospects.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107259"},"PeriodicalIF":3.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sedimentary control on permeability heterogeneity: The middle Buntsandstein continental sandstones (Lower Triassic, eastern France)","authors":"Lucas Bofill ,&nbsp;Guilherme Bozetti ,&nbsp;Gerhard Schäfer ,&nbsp;Jean-François Ghienne ,&nbsp;Mathieu Schuster ,&nbsp;Michael J. Heap ,&nbsp;Gabriela Knobelock ,&nbsp;Claiton Scherer ,&nbsp;Garibaldi Armenlenti ,&nbsp;Ezequiel de Souza","doi":"10.1016/j.marpetgeo.2024.107261","DOIUrl":"10.1016/j.marpetgeo.2024.107261","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Understanding the influence of sedimentary processes on reservoir architectures can be essential for improving the prediction of permeability heterogeneity. The Upper Rhine Graben offers an ideal geological context for using outcrops as reservoir analogues, as the rocks cropping out at the Graben's shoulders belong to the same formations that host lithium-rich geothermal brine in the Graben. The interval of interest in this study, the upper section of the Lower Grès Vosgien Formation (LGV), consists of fluvio-aeolian deposits considered preferential zones for fluid migration within the Buntsandstein Group. In this study, the main factors controlling permeability heterogeneity distribution of these fluvio-aeolian deposits are presented, in different scales, by combining permeability and petrographic characteristics with quantitative sedimentological characterisation of the LGV. The fluvial channel facies association (FA), predominantly composed of cross-bedded sandstones deposited in braided channels, exhibits higher permeability compared to the wind- and water-laid FA, made up of sandstones deposited in a sand-sheet-dominated aeolian system. Vertical profiles reveal permeability contrasts of up to four orders of magnitude between these FAs. At the facies scale, the fluvial channel FA shows a distinction in permeability associated with facies formed under different flow-regime conditions. Trough cross-bedded sandstones, formed under lower flow-regime conditions, exhibit higher permeability than low-angle cross-bedded sandstones, formed mainly under upper flow-regime conditions. In the wind- and water-laid FA, permeability distribution is directly influenced by palaeoclimatic variations. Low-permeability hybrid sand sheets (HSS) were deposited under relatively humid conditions, while high-permeability aeolian dunes (AD) formed during more arid periods. Despite the high permeability of the AD, the architecture of the wind- and water-laid FA suggests that the AD have low connectivity potential. The lateral continuity of the wind- and water-laid FA, extending over hundreds of metres, combined with the dominant occurrence of low-permeability HSS, indicates that this facies association may act as flow baffles or barriers. Compaction is the main process influencing the permeability and porosity of the LGV. Samples with a higher proportion of lithoclasts and infiltrated clay recorded a more advanced degree of compaction. In contrast, samples with a higher percentage of quartz overgrowth were less compacted. The diagenetic overprint affected the distinct facies differently, indicating that primary sedimentary processes and architecture govern the distribution of permeability heterogeneity in the LGV. Permeability data from outcrops exhibited median values up to three orders of magnitude higher than those from subsurface data. However, the same facies and similar trends of relative porosity-permeability responses to the distinct sedimentary featur","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107261"},"PeriodicalIF":3.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reactivation of abandoned oilfields for cleaner energy generation: Two-dimensional modelling of lateral stratigraphic variations","authors":"Benjamin M. Storey ,&nbsp;Richard H. Worden ,&nbsp;David D. McNamara ,&nbsp;John Wheeler ,&nbsp;Julian Parker ,&nbsp;Andre Kristen","doi":"10.1016/j.marpetgeo.2024.107252","DOIUrl":"10.1016/j.marpetgeo.2024.107252","url":null,"abstract":"<div><div>Abandoned oil fields can be stimulated by the injection of air to produce energy by way of the direct use of the heat and pressure generated by in-situ oxidation of oil, or thermogenesis, in enhanced geothermal systems. This paper will assist in the selection of potential fields for reactivation by showing the potential enthalpy generation of realistic reservoirs based on North Sea analogues and how natural reservoir quality variation will affect the success of any potential applications. Previously, air injection has primarily been used as an enhanced oil recovery technique, although it has been plagued with failures now attributed to poor reservoir selection and project design. We propose that an insufficient understanding of the geology of the reservoir is a key reason that so many air injection projects have failed. With the aid of computer numerical modelling, we aim to understand how reservoir porosity, permeability, and petrophysical heterogeneity affect the process. Here we have used two-dimensional, map-view models to evaluate a selection of homogeneous and heterogeneous reservoir architectures broadly based on North Sea oil fields. Our models demonstrate that the combination of degree of random heterogeneity and architecture of facies-controlled heterogeneities play more significant roles in the temperature, velocity, and stability of the reaction front across the reservoir than either average porosity or permeability. The strong influence of reservoir petrophysical heterogeneity on the effectiveness of the air injection process highlights the need to fully understand how such reservoir properties are distributed both randomly and via predictable facies-controls, and, in turn, how these are further influenced by reservoir-scale geological architecture.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107252"},"PeriodicalIF":3.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Garn Formation in the Maria and Lavrans Fields, Central Halten Terrace, Norwegian Continental Shelf: Sedimentological features and depositional history","authors":"Obasuyi F.O ,&nbsp;Longhitano S.G ,&nbsp;Chiarella D ,&nbsp;Mellere D","doi":"10.1016/j.marpetgeo.2024.107236","DOIUrl":"10.1016/j.marpetgeo.2024.107236","url":null,"abstract":"<div><div>We describe the sedimentological features of the Middle Jurassic Garn Formation accumulated in the central sector of the Halten Terrace, Norwegian Continental Shelf. The Garn Formation is a siliciclastic sandstone-rich succession, exhibiting a variety of cross stratification that have been investigated by a series of previous studies thanks to its many hydrocarbon-bearing sandstone intervals. Because of its variable sedimentological character and the complex structural setting of the region where the unit is present, the Garn Formation has been attributed to a wide range of different depositional settings. As such, no clear process or environmental identification exists for this formation, potentially hampering exploration and production strategies.</div><div>Here we investigate six wells recording the Garn Formation in the Maria and Lavrans fields, covering a total of 190 m of cored intervals. Gamma-Ray-based stratigraphic trends suggest that the Garn Formation initially accumulated during a period of forced regression and lowstand and subsequently during a long-lasting phase of transgression punctuated by stages of normal regression. Facies analysis identifies six recurrent lithofacies in the generally sandstone-dominated strata, where very-well sorted medium-grained arenites exhibiting hierarchies of cross stratification and alternating fine-grained intervals, are the most recurring sedimentological motifs recognisable in many of the analysed core intervals.</div><div>Our interpretation suggests a marine, sub-tidal depositional setting, where the dominant process of sediment transport and accumulation was exerted by tidal currents, flowing prevalently in a SSW direction and promoting the formation of a series of sand shoals and banks, hosting superimposed smaller bedforms (i.e., bars and dunes). These large-scale composite sand bodies were in places separated by bathymetrically-deeper inter-dune areas, which were prone to mud accumulation and bioturbation by organisms preferring quieter hydrodynamic conditions. During an initial period of relative forced-regressive conditions and shallow water, the top of these sand accumulations might have been reworked by waves and incised by shallow channels generated by tidal flows.</div><div>The elongation of the dune fields, as well as the presence of similar reservoir bodies in the area, and the orientation of normal faults dissecting this part of the Halten Terrace during the Middle Jurassic, sustain the hypothesis of a wide marine seaway (i.e., the Laurasian Seaway), connecting the Boreal Ocean in the north and the Tethys Ocean in the south.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107236"},"PeriodicalIF":3.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential fluid migration process inferred from integrated active-source seismic imaging in the Nankai Trough subduction zone off Cape Muroto, Japan","authors":"Kazuya Shiraishi,&nbsp;Gou Fujie,&nbsp;Ryuta Arai,&nbsp;Yasuyuki Nakamura","doi":"10.1016/j.marpetgeo.2024.107258","DOIUrl":"10.1016/j.marpetgeo.2024.107258","url":null,"abstract":"<div><div>We investigate the potential fluid migration process in a plate subduction zone on the basis of integrated active-source seismic imaging from multichannel seismic (MCS) reflection and ocean-bottom seismograph (OBS) wide-angle seismic surveys along a 100 km-long line in the area offshore of Cape Muroto in the central Nankai Trough. First, to overcome poor reflection imaging in a thick part of the accretionary wedge and discrepancies between the results of conventional analyses from different datasets, we apply a signal enhancement technique in addition to standard preprocessing for the MCS reflection data and prestack depth migration based on a high-resolution seismic velocity model derived by full waveform inversion (FWI) using wide-angle OBS data. The improved MCS reflection profiles clarify the detailed geological architecture consistent with the seismic velocity variations with significant low-velocity zones in the accretionary wedge. A low-velocity band elongated immediately above the oceanic crust implies possible high pore fluid pressure in the underthrust sequence. A low-velocity column passing through the thick accretionary wedge could suggest the existence of gas-rich fluid in fault/fracture zones caused by subsequent deformation due to the oblique subduction of the Philippine Sea plate accompanied by multiple seamounts and topographic relief. We propose a schematic model of potential fluid migration in the central Nankai Trough subduction zone. The hemipelagic muddy sediments and turbidites containing organic carbon deposited in the Shikoku Basin were transported downward by underthrusting. High pore fluid pressure, which is caused by rapid loading and clay mineral dehydration within the underthrust sequence, may lead upward fluid migration through fault zones. Thermogenic methane generated at depth is a driving force of buoyancy for upwelling through permeable parts of fractures or dipping strata. In addition to biogenic methane, migrated thermogenic methane is also a source of widely distributed gas hydrates.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107258"},"PeriodicalIF":3.7,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depositional and diagenetic evolution of the Lower Eocene homoclinic-ramp carbonates (a paradigm from the Salt Range, Pakistan): Sequence stratigraphic, petrographical, diagenetic, and geochemical attributes","authors":"Jabir Hussain ,&nbsp;Mumtaz Ali Khan ,&nbsp;Ahmed E. Radwan ,&nbsp;Tassawar Hayat","doi":"10.1016/j.marpetgeo.2024.107233","DOIUrl":"10.1016/j.marpetgeo.2024.107233","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Despite the economic significance of the lower Eocene carbonate of the Nammal Formation as a hydrocarbon resource, the influence of depositional facies and diagenetic sequences on the Nammal reservoir quality remains limited. A study on the sedimentological, sequence stratigraphic, diagenetic, and geochemical attributes of the Nammal carbonates has been carried out in three surface sections: Nammal section (NS), Sethi section (SS), and Mustafabaad section (MS). To achieve the study target, various petrographic analyses of samples, geochemical analyses (X-ray diffraction (XRD) and X-ray fluorescence (XRF)), and petrophysical measurements (i.e., porosity and permeability) have been intergrated in this study. Our analysis unveils that the Nammal Formation contains mainly alternating marl, shale, and limestone beds. The facies distribution in the middle and upper parts of the Nammal Formation predominantly comprises larger benthic foraminifera, for instance, nummulitids (&lt;em&gt;Nummulites&lt;/em&gt; and &lt;em&gt;Assilina&lt;/em&gt;), discocyclinids, and rare alveolinids, which demarcate a deepening upward sequence or fining-upward depositional trend. The distribution of these facies is extended from the west to the central parts of the Salt Range, and it is marked as a condensed section in the middle parts of the formation overlain by shallower strata. The upper part of the formation is characterized by a shallowing-up sequence, as there are assemblages of nummulitids, alveolinids, and shallower fauna that extends towards the eastern parts of the Salt Range. The sedimentological analysis of the Nammal Formation depicts the identification of nine microfacies of four recognizable facies associations, revealing the deposition of the Nammal Formation in variable low-to high-energy carbonate ramp sub-environments, including carbonate lagoons to barrier/shoals, open marine, and deep open marine settings. The Nammal Formation represents the transgressive system tracts (TST) of the Early Eocene carbonate sequence, reflecting carbonate deposition during the rise in sea level in the form of a retrogradational depositional trend of the shallowing upward facies. The Nammal Formation underwent a complex multi-stage diagenetic history taking place over a range of diagenetic settings, including shallow burial, early Eocene uplift and erosion, and subsequent deep burial. Among the recorded diagenetic changes and processes (e.g., dissolution and fracturing) that improved the reservoir properties, others (e.g., cementation, micritization, mechanical and chemical compaction, and pyritization) reduced them by plugging the pore spaces and voids. The Nammal Formation is suggested to be a relatively tight reservoir based on the porosity and permeability values and the nature of compact carbonates. The studied Eocene carbonate deposits preserve carbonate analogues liable for allostratigraphic correlation, identical lithostratigraphic analogues, age constraints, and basin-wide geometr","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107233"},"PeriodicalIF":3.7,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Organic-walled dinoflagellate cyst record across the Campanian–Maastrichtian (Upper Cretaceous) boundary stratotype section (Tercis-les-Bains, SW France)","authors":"Mariusz Niechwedowicz ,&nbsp;Silke Voigt ,&nbsp;Delphine Desmares ,&nbsp;Agata Jurkowska ,&nbsp;Mathieu Martinez","doi":"10.1016/j.marpetgeo.2024.107249","DOIUrl":"10.1016/j.marpetgeo.2024.107249","url":null,"abstract":"<div><div>The Global Boundary Stratotype Section and Point (GSSP) for the base of the Maastrichtian Stage (Tercis-les-Bains, SW France) was formally approved in 2001, but over the years the boundary definition gave rise to serious doubts about the utility of some of the macro- and microfossil events chosen to approximate the position of the boundary. To address the issue, the Subcommission on Cretaceous Stratigraphy appointed a new Maastrichtian Working Group, whose members recently revisited Tercis section. Re-sampling of the GSSP locality revealed relatively rich and diverse dinoflagellate cyst assemblages. The stratigraphic succession of the highest (HOs) and lowest (LOs) occurrences of particular cyst taxa is compared with the dinoflagellate cyst record previously reported from the site and elsewhere. We noticed that among the dinoflagellate cyst events included in the definition of the Campanian–Maastrichtian boundary, only the HOs of <em>Raetiaedinium evittigratia</em>, and of <em>R. truncigerum</em> can be used as good boundary markers. Other formal cyst bioevents either had a restricted biogeographical distribution (<em>Corradinisphaeridium horridum</em>), or disappear distinctly above the Maastrichtian GSSP level (<em>Samlandia carnarvonensis</em>, <em>S. mayi</em>). The HOs of <em>Coronifera oceanica</em>, <em>Gillinia hymenophora</em>, <em>Odontochitina costata</em>, <em>Xenascus ceratioides</em>, and the LOs of <em>Cladopyxidium paucireticulatum</em>, <em>C. saeptum</em>, <em>C. verrucosum</em>, <em>Glaphyrocysta expansa</em>, and of <em>G. pala</em>, can probably also be used to approximate the Campanian–Maastrichtian transition. The actual utility of the above-mentioned bioevents seems promising, but requires further studies. First preliminary paleoenvironmental data were acquired based on the composition of the entire dinoflagellate cyst assemblage from Tercis.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107249"},"PeriodicalIF":3.7,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reproduction of channel stacking patterns in geomodeling: Metrics and impact of the modeling strategy on reservoir flow behavior","authors":"Enrico Scarpa ,&nbsp;Pauline Collon ,&nbsp;Irina Panfilova ,&nbsp;Guillaume Caumon","doi":"10.1016/j.marpetgeo.2024.107235","DOIUrl":"10.1016/j.marpetgeo.2024.107235","url":null,"abstract":"<div><div>Channelized turbidite systems are often grouped into complexes and exhibit various stacking patterns, which play a crucial role in controlling the connectivity between high-permeability and low-permeability sedimentary bodies. While some studies have analyzed the static connectivity of different stacking patterns, few have quantitatively evaluated the dynamic implications of these patterns on fluid flow circulation at large scale, and no method have started to compare the outcome of different modeling methods. This study addresses this gap by quantitatively investigating the impact of different classes of geostatistical modeling methods on both static and dynamic connectivity using multiple metrics. Using an original object-based simulation method, we have stochastically generated 3 different stacking pattern sets of 100 realizations each with similar facies proportions, that represent: (i) disorganized channels, (ii) independent channels conditioned to a vertical sand proportion map, and (iii) organized stacking that reproduce vertical and lateral migration of channels. Channel internal heterogeneities are neglected and homogeneous properties are attached to the three main facies: channels, inner levees and outer levees. To analyze the hydrodynamic responses, we set up a two-phase system of oil and water. Reservoir simulations are performed for all 300 realizations, providing production curves, saturation field and pressure field. Classical dynamic metrics (breakthrough time and recovery efficiency) are completed by original ones, designed to understand what governs the differences between the sets: at 30% of the Pore Volume Injected, saturation front shapes are extracted and we compute their surface area and sphericity to get objective comparison criteria. Results reveal significant differences in flow behavior across the three studied sets of stacking models: Disorganized stacking patterns, and, to a smaller extent, the conditioned disorganized stacking patterns, exhibit delayed water breakthrough times and more optimistic recovery than organized stacking patterns, which have, however, a higher static connectivity. This unexpected result seems to be related to gravity-driven fluid segregation in the considered reservoir production settings. Overall, these results quantitatively confirm that the ability of the channel simulation method to generate realistic stacking pattern is essential. In addition, the lack of a clear relationship between static and dynamic connectivity metrics suggests the need for further research to develop more effective forecasting techniques for reservoir behavior in turbiditic channel settings.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"173 ","pages":"Article 107235"},"PeriodicalIF":3.7,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}