Marine and Petroleum Geology最新文献

{"title":"Transport and depositional processes of mud in lacustrine environments：From sediment plumes to hyperpycnal flows","authors":"Mingqian Wang ,&nbsp;Zhiyang Li ,&nbsp;Yuanyuan Zhang","doi":"10.1016/j.marpetgeo.2024.107150","DOIUrl":"10.1016/j.marpetgeo.2024.107150","url":null,"abstract":"<div><div>Lacustrine mudstones are usually considered as deposited dominantly through vertical suspension fallout in low-energy environments influenced by only occasional fine-grained turbulent flows, while the deposition of their marine counterpart have been increasingly documented to be subject to more complex and dynamic processes. To provide insights into the dynamic processes that transport and deposit mud in lacustrine settings, this study presents an integrated petrographic, sedimentological, geochemical, and sequence-stratigraphic analysis of an ancient lacustrine mudstone-dominated succession using outcrops of the Lucaogou Formation in the Junggar Basin. Detailed facies characterization has revealed seven facies associations, which show spatial and temporal variations within a stratigraphic framework and stack to form eight repetitive parasequence styles. Process-based sedimentological analysis allows the identification of multiple transport mechanisms in different depositional settings, which strongly suggests that mud in lake systems is commonly subject to multiple dynamic transport processes (i.e., sediment plumes, turbidity flows, hyperpycnal flows, and wind-driven bottom currents), rather than suspension fallout under overall quiet conditions. The differences in the expression of parasequence styles can be attributed to the combination of allogenic and autogenic processes, which systematically change with distances from the shoreline. It is important to note that river-floods can discharge large amounts of mud into the deep lake setting. The strong correlation between geochemical data and the distribution of facies generated by riverine processes indicates that in saltwater lakes terrigenous mud is mainly transported to the deep water by sediment plumes and turbidity flows, whereas in freshwater lakes it is transported primarily by hyperpycnal flows. This study demonstrates that the transport and depositional processes of lake mud are diverse and vary systematically in response to lake conditions and environmental changes. High-resolution petrographic and sedimentologic analysis is essential to identify these dynamic processes, which allows more critical and accurate interpretations of depositional conditions and long-term depositional trends in lake systems.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107150"},"PeriodicalIF":3.7,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537098","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":"Chronology and geofluids characteristics of calcite cement in the Upper Triassic Xujiahe Formation tight sandstone reservoir, Wstern Sichuan Basin, SW China","authors":"Jianchao Zheng ,&nbsp;Liangbiao Lin ,&nbsp;Yu Yu ,&nbsp;Qian Yuan ,&nbsp;Long Wen ,&nbsp;Xiang Deng ,&nbsp;Yi Huang ,&nbsp;Yuchao Qiu ,&nbsp;Jiaqi Wei ,&nbsp;Chao Zheng ,&nbsp;Fanchi Nan","doi":"10.1016/j.marpetgeo.2024.107148","DOIUrl":"10.1016/j.marpetgeo.2024.107148","url":null,"abstract":"<div><div>Geological fluid activities significantly influence diagenesis and hydrocarbon accumulations in reservoir rocks. However, it remains challenging to precisely determine the timing of these activities. This study aims to investigate the chronology and geofluids characteristics of calcite cement that leads to reservoir tightness in the Upper Triassic Xujiahe Formation in the Western Sichuan Foreland Basin, which is a critical exploration target for hydrocarbon resources. We examine calcite cement as a marker of fluid activities, employing petrological analyses, U-Pb dating, and in-situ carbon-oxygen isotope analysis. These methods are integrated with simulations of regional burial and thermal histories to assess pore evolution and hydrocarbon accumulation mechanisms in these tight sandstone reservoirs. Results reveal two main calcite cementation stages within the second member of the Xujiahe Formation (Xu-2 Member): early cements from the Middle Jurassic around 175 ± 11 Ma and late cements from the Late Jurassic between 161 and 156 Ma. Initially, basin-derived alkaline fluids and near-surface atmospheric freshwater supplied the calcium and carbon for early cements during ongoing basin subsidence. Calcium and carbon for the late calcite cements came from the dissolution of carbonate rock fragments by organic acids. The heavier δ¹³C is primarily associated with in-situ generation and consumption of carbon within the system, while the δ¹⁸O_{<em>fluid</em>}, which is close to modern seawater values, is mainly related to active water-rock reactions induced by processes such as the dissolution of carbonate rock fragments by organic acids. The closed diagenetic system due to calcite cementation in the Late Jurassic led to reservoir tightening. Therefore, basin-scale chronological constraints on calcite cement are of great significance for quantitatively studying sandstone reservoir densification and exploring the mechanism and control factors of hydrocarbon accumulation.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107148"},"PeriodicalIF":3.7,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537969","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":"Detrital zircon provenance record of the northern shelf in the Rakhine Basin, Bay of Bengal","authors":"Liangbo Ding ,&nbsp;Hongxia Ma ,&nbsp;Guozhang Fan ,&nbsp;Xiaoyong Xu ,&nbsp;Hongping Wang ,&nbsp;Guoping Zuo ,&nbsp;Ying Zhang ,&nbsp;Hui Sun ,&nbsp;Jianan Wu ,&nbsp;Junmin Jia ,&nbsp;Ming Su ,&nbsp;Ce Wang","doi":"10.1016/j.marpetgeo.2024.107141","DOIUrl":"10.1016/j.marpetgeo.2024.107141","url":null,"abstract":"<div><div>The Cenozoic strata in the Rakhine Basin play a crucial role in hydrocarbon exploration; however, the provenance of these sedimentary rocks remains poorly investigated. In this study, we employed detrital zircon geochronology and geochemistry in the northern Rakhine shelf to investigate the provenance of sedimentary rocks and, combined with the previous studies, to identify their spatial and temporal variations and to elucidate the provenance evolution since the middle Miocene. The geochemical results of the zircons indicate that the primary source rocks of the sedimentary rocks are magmatic and metasedimentary rocks, particularly those of continental arc and post-collision granites. The origin of these rocks can be attributed to the Gangdese arc magmatic belt in the north, as well as the Indo-Burma Ranges in the east. The sedimentary rocks in the northern Rakhine yield zircon U-Pb age peaks primarily at 0–150 Ma, 400–600 Ma, 600–1000 Ma, and 1600–2100 Ma, with minor populations at 150–400 Ma and &gt;2100 Ma. The detrital zircon provenance study shows that the zircons in the Miocene sedimentary rocks were primarily derived from the paleo-Brahmaputra River, with contributions ranging from 68.7% to 77.0%. During the Pliocene, the paleo-Brahmaputra River and the Chittagong-Tripura Fold Belt were the most significant sediment suppliers. Since the early Pleistocene, the northern Rakhine coastal region has played a significant role in their composition. The Brahmaputra River was the predominant contributor to upper Pleistocene rocks, and the Rakhine coastal region's contribution to the shelf intensified throughout the Pleistocene. In conjunction with regional tectonic evolution, our study underscores the importance of the Indian Plate subduction as a pivotal factor influencing the provenance transitions in the northeastern Bay of Bengal.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"171 ","pages":"Article 107141"},"PeriodicalIF":3.7,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529227","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":"Depositional and diagenetic controls on the reservoir quality of marginal marine sandstones: An example from the Early Devonian subbat member, jauf formation, northwest Saudi Arabia","authors":"Anas Muhammad Salisu ,&nbsp;Hasan Algheryafi ,&nbsp;Abdulwahab Muhammad Bello ,&nbsp;Abduljamiu O. Amao ,&nbsp;Bandar Al-Otaibi ,&nbsp;Khalid Al-Ramadan","doi":"10.1016/j.marpetgeo.2024.107147","DOIUrl":"10.1016/j.marpetgeo.2024.107147","url":null,"abstract":"<div><div>The reservoir quality of marginal marine sandstones can vary significantly across different depositional lithofacies. This variation is primarily due to differences in depositional processes and subsequent diagenetic alterations occurring during various stages of burial. To address this issue, this study focuses on the Early Devonian Subbat sandstones of the Jauf Formation, which serve as an important analogue for subsurface gas reservoirs and have potential for CO₂ sequestration. An integrated approach was employed, including field observations, petrography, geochemical analyses, and petrophysical analyses, to investigate the impact of depositional and diagenetic processes on reservoir quality. The findings indicate that the sandstones range from poorly to well sorted, very fine to medium-grained arkosic and quartz arenites that were deposited in a range of environments including shoreface-to-offshore transition zones, wave-dominated deltas, fluvial and tidal estuarine channels. The sandstones experienced both shallow and deep burial diagenesis, while key diagenetic events affecting reservoir quality include compaction, carbonate cementation, the formation of authigenic clays (kaolinite, illite, and chlorite), quartz overgrowth, and the dissolution of unstable feldspar and mica grains. Authigenic pore-filling cements and grain-coating clays significantly influence reservoir quality. The effect of quartz cementation was minimal where illite and/or chlorite coatings are well-developed. Mechanical compaction is more pronounced in the shoreface-to-offshore transition compared to the estuarine channels likely due to the higher detrital matrix content (21.7–35%, avg. 26.7%). The well-sorted fluvial to estuarine channel sandstones exhibit the best reservoir quality, with porosity ranging from 15.9% to 25.5% (average 20.4%) and permeability between 433.8 mD and 1261.2 mD (average 720 mD). This high reservoir quality is attributed to the low detrital matrix content (0–1%, average 0.2%) and limited pore-filling cements. In comparison, the moderately sorted, wave-dominated delta sandstones have lower porosity (5.3–11.2%, average 8.2%) and permeability (17.8–80 mD, average 42.8 mD), despite a relatively higher detrital matrix content (0–11.5%, average 2.8%). The poorly sorted shoreface-to-offshore transition sandstones exhibit the lowest reservoir quality, with porosity ranging from 1% to 2% (average 1.5%) and permeability between 0.3 and 1.1 mD (average 0.7 mD). These variations in reservoir quality among different depositional facies are primarily linked to depositional factors (sorting and detrital clay matrix) and shallow to deep burial diagenetic processes (compaction and cementation). A comprehensive understanding of these processes can enhance reservoir quality prediction in the Jauf Formation and similar reservoirs elsewhere.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107147"},"PeriodicalIF":3.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537968","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":"Depositional characteristics in the Lower Congo Basin during the Cenomanian-Turonian stage: Insights from fine-grained sedimentary rocks","authors":"Bin Zhang ,&nbsp;Hongtao Zhu ,&nbsp;Xianghua Yang ,&nbsp;Zhiwei Zeng ,&nbsp;Zhongheng Sun ,&nbsp;Linan Pang ,&nbsp;Tingting Yao","doi":"10.1016/j.marpetgeo.2024.107151","DOIUrl":"10.1016/j.marpetgeo.2024.107151","url":null,"abstract":"<div><div>The Cenomanian-Turonian (C-T) stage, marked by extensive black shales and Oceanic Anoxic Event 2 (OAE 2), is pivotal for deciphering paleoceanographic conditions and the main drivers of hydrocarbon formation. Despite its significant oil and gas potential, the Lower Congo Basin (LCB) in central West Africa, particularly during the C-T stage (Likouala Formation), has been severely understudied, primarily due to limited exploration and a historical preference for other basins. Therefore, understanding the depositional characteristics of the C-T stage in the LCB is essential for elucidating paleoceanographic conditions, evaluating hydrocarbon potential and interpreting environmental changes. Due to the limited availability of published data and samples, we employed a targeted and integrated geological analysis to gain comprehensive insights, encompassing logging, lithofacies identification, thin-section observations, grain size measurements, and geochemical analyses (major, trace, and rare earth elements), to provide a cohesive and confirmatory assessment. Utilizing relative sea-level curves and geochemical indicators, and by comparing with other relevant basins, this study preliminarily identified OAE 2 stratigraphic intervals and attempted to discuss the impact of OAE 2 on organic matter enrichment in the LCB. The results indicate that, during the C-T stage, the LCB featured a restricted sea bay environment with limited terrestrial input and anoxic waters. Multiple geochemical proxies suggest that relative sea-level changes significantly affected paleoproductivity, thereby influencing organic matter enrichment. During the depositional period of Lower Likouala Formation (LLF), a relative sea-level drop resulted in weakly reducing conditions in a marginal restricted sea bay environment, leading to low primary productivity. Conversely, during the depositional period of Upper Likouala Formation (ULF), enhanced aeolian input and sea-level rise increased nutrient supply from the open ocean. This led to elevated surface marine productivity and intensified reducing conditions in the water column, forming a marginal semi-restricted sea bay environment. Enhanced reducing conditions within the lower stratigraphic intervals of the ULF are likely consequences of OAE 2. However, the marginal restricted sea bay environment and limited water exchange may have constrained the enhancement of paleoproductivity by OAE 2. These insights not only significantly enhance our understanding of the organic-rich fine-grained sedimentary rocks in the LCB during the C-T stage, but also contribute to a broader comprehension of the South Atlantic's paleoceanographic conditions and the interplay between regional geological processes and global climate events during the C-T stage.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107151"},"PeriodicalIF":3.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432054","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":"Gas-bearing clastic mounds left by salt dissolution","authors":"William B.F. Ryan ,&nbsp;Yossi Mart","doi":"10.1016/j.marpetgeo.2024.107153","DOIUrl":"10.1016/j.marpetgeo.2024.107153","url":null,"abstract":"<div><div>Tall mounds buried beneath a Pleistocene/Pliocene cover in the ancient El Arish and Afiq Canyons on the Levant margin of the eastern Mediterranean are interpreted as inversion structures consisting of sands that had once filled solution pits in Messinian-age halite. The mounds serve as reservoirs of natural gas. The sands belong to the Yafo Sand Member (YSM) of the Yafo Fm. and were previously attributed to the early Pliocene. However, the presence of ostracods and benthic foraminifera diagnostic of the Lago Mare stage of the Messinian Salinity Crisis assign the YSM to a late Miocene age when Mediterranean had transformed from a brine-filled sea to brackish lakes. The YSM and its equivalent Afiq Member of the Mavqiim Formation are present in cuttings from numerous exploration wells at elevations on the margin from 2500 to 500 m below today's sea level, whereas the preceding halite has mostly disappeared and is only preserved on the margin at a few locations above 1700 m. The YSM, Afiq Mbr. and a nearly 2-km-thick halite layer is observed on the basin floor in a network of reflection profiles. Profiles show that beyond the canyon mouths where the YSM overlies halite, the YSM fills circular cavities in the halite that resemble dolines, indicating that dissolution of salt had commenced earlier. The halite buries deep-sea channels emanating from the slope canyons and reaching far into the distal Levant basin where exceptionally large fields of gas have been discovered. This study suggests that the gas in the mounds might be linked to the same source as in the offshore deep-water fields and was delivered up dip to the canyon mounds via channelized sands underneath a halite seal that broke beneath the canyon floors during subsequent dissolution.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107153"},"PeriodicalIF":3.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428057","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":"Pore and fracture characteristics and diagenetic evolution mechanisms of low-maturity lacustrine shales from the Paleogene Shahejie Formation in the Jiyang Depression, Bohai Bay Basin, Eastern China","authors":"Quan Rao ,&nbsp;Zhiliang He ,&nbsp;Tian Dong ,&nbsp;Weiqing Wang ,&nbsp;Xunyao Wang ,&nbsp;Liqiang Rao ,&nbsp;Ting Wang ,&nbsp;Liwen Huang","doi":"10.1016/j.marpetgeo.2024.107154","DOIUrl":"10.1016/j.marpetgeo.2024.107154","url":null,"abstract":"<div><div>Pore and fracture characteristics and diagenetic evolution pathways are crucial for understanding the storage and flow capacity of shale reservoirs. Compared with marine shales in North America and South China, lacustrine shales typically exhibit low maturity, high clay content, and abundant laminae. The pore and fracture characteristics and diagenetic evolution pathways of low-maturity lacustrine shales remain poorly understood. This study integrates thin-section observations, fluorescence analysis, organic geochemical analysis, X-ray diffraction (XRD) mineralogy, low-temperature nitrogen adsorption (LTNA), and high-resolution scanning electron microscopy-energy dispersive X-ray spectroscopy-cathodoluminescence (SEM-EDS-CL) image analysis to systematically investigate pore and fracture types, pore size distribution, diagenetic reactions, and major factors controlling pore development in the Es3x–Es4s lacustrine shales from the Jiyang Depression, Bohai Bay Basin. The low-maturity lacustrine shales primarily consist of interparticle pores between mineral particles, interparticle pores between clay platelets, intercrystalline pores between carbonate minerals, and dissolution pores, whereas organic-matter pores are undeveloped. The observed fractures are primarily horizontal bedding fractures, followed by structural fractures and abnormal pressure fractures. Calcareous mixed shales and siliceous mixed shales have a higher proportion of large-sized mesopores (&gt;30 nm in pore size) and macropores compared with argillaceous mixed shales. Pore development is mainly influenced by the type, content, and existing forms of inorganic minerals, but less affected by TOC content. Clay mineral content and siliceous mineral content are weakly positively correlated with total pore volume. The pore decline by pore-filled carbonate cements may exceed the pore increase by carbonate recrystallization and dissolution, leading to the weakly negative correlation between carbonate mineral content and total pore volume. Among the four main laminae, sparry calcite laminae (SCAL) and sparry dolomite laminae (SDL) exhibit higher reservoir quality compared with argillaceous laminae (AL) and micrite calcite laminae (MCAL). The reservoir quality of the corresponding three laminae combinations is ranked as follows: AL + SCAL &gt; AL + MCAL + SDL &gt; AL + MCAL. Laminae combinations are beneficial to the development of horizontal bedding fractures. The early stage of middle diagenesis is a key stage for the formation of secondary pores. When the R_o values exceed approximately 0.6%, the total pore volume increases obviously because of dominant diagenetic reactions including organic acid dissolution, carbonate recrystallization, and rapid smectite illitization.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107154"},"PeriodicalIF":3.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432053","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":"Axial and transverse river deposits preserved in an Aptian rift basin, Northeastern Brazil: Implications for sandstone reservoir quality","authors":"Liliane Janikian ,&nbsp;Renato Paes de Almeida ,&nbsp;Felipe Torres Figueiredo ,&nbsp;Bernardo Tavares Freitas ,&nbsp;Natalia Naches Hilbert ,&nbsp;Simone Campos Carrera ,&nbsp;Marly Babinski ,&nbsp;Maria Ramos-Clavijo ,&nbsp;Cristiano Padalino Galeazzi ,&nbsp;Gelson Luís Fambrini ,&nbsp;Virgínio Henrique de Miranda Lopes Neumann","doi":"10.1016/j.marpetgeo.2024.107139","DOIUrl":"10.1016/j.marpetgeo.2024.107139","url":null,"abstract":"<div><div>A syn-rift, up to 250 m thick, fluvial sandstone unit of Aptian age (Marizal Formation, Tucano Basin, northeastern Brazil) preserves the deposits of an axial fluvial system and contemporary tributaries. These deposits exhibit characteristic variations in composition, grain size, and paleocurrents, indicating different sources for each system. There is a systematic downstream increase in the tributary contribution to the axial system along the basin axis. This sediment mixture model is established based on extensive paleocurrent data in conjunction with macroscopic, microscopic, and detrital zircon provenance data. The spatial distribution of diagenetic patterns and reservoir permo-porosity properties were compared to the paleogeographic model. The comparison revealed that the increase in lithic fragments brought by a main tributary led to a reduction in intergranular porosity and permeability of axial system deposits downstream, following a change in pebble and sand composition. Our findings highlight that the relative amount of bedload brought by tributaries plays a crucial role in the composition and diagenetic evolution of fluvial reservoirs. Spatial variations in sandstone composition at specific stratigraphic intervals are expected due to the intricate patterns of mixture and preservation of axial and transverse river deposits within fault-bounded basins.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107139"},"PeriodicalIF":3.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537975","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":"Shallow subsurface fluid dynamics in the Malvinas Basin (SW Atlantic): A geoacoustic analysis","authors":"J.P. Ormazabal ,&nbsp;E. Lodolo ,&nbsp;M.E. Bravo ,&nbsp;S. Principi ,&nbsp;F.I. Palma ,&nbsp;D.M. Bran ,&nbsp;J.I. Isola ,&nbsp;F.D. Esteban ,&nbsp;A.A. Tassone","doi":"10.1016/j.marpetgeo.2024.107149","DOIUrl":"10.1016/j.marpetgeo.2024.107149","url":null,"abstract":"<div><div>Using a database consisting of sub-bottom profiles, 2D and 3D seismic data, a series of seep structures and acoustic anomalies associated with a plumbing system in the subsurface of the southern part of the Malvinas Basin off the Argentine coast are presented. The seep morphologies consist of mounds, pockmarks, and a carbonate mound, derived from hydrocarbons migrating from the Early Cretaceous Springhill and Lower Inoceramus formations through extensional faults and overthrusts of the Malvinas Fold-Thrust Belt and accumulating in the gas hydrate stability zone. This configuration is widely observed in the anticlines of the Malvinas Fold-Thrust Belt, which are characterized by a vertical structure highlighting a Bottom Simulating Reflector (BSR) overlain by a blanked-out zone at the seabed, interpreted as a gas hydrate stability zone. The plumbing system is influenced by active transtensional tectonics, as shown by two sets of extensional faults concentrated over some anticlines. These faults lead to displacements that, in many cases, reach the seabed. One nuance of the influence of tectonic activity on fluid escape is most evident in the Malvinas anticline, where all the pockmarks and the carbonate mound are concentrated. In the western part of the Malvinas anticline, five pockmarks are observed in an area characterized by a shallow BSR. In contrast, in the eastern part of the Malvinas Basin, one pockmark and one carbonate mound are derived from a series of extensional faults. The presented data, as well as a comparison between the western and eastern parts of the Malvinas anticline, indicate that the anticlines are the main cause of seepage in this area, as they allow the accumulation of migrating fluids. Likewise, the seepage morphologies outside the anticlines are much less pronounced, as can be observed in the mounds that overlie the bottom vents.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107149"},"PeriodicalIF":3.7,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428050","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":"Corrigendum to ‘Mudstone diagenesis with depth and thermal maturity in the Cenomanian–Turonian Eagle Ford Group. PART II: Diagenetic processes and paragenetic sequence’ [Mar. Petrol. Geol. 170 (2024) 107085 1–39]","authors":"Lucy T. Ko ,&nbsp;Robert G. Loucks ,&nbsp;Harry Rowe ,&nbsp;Rieko Adriaens ,&nbsp;J. Evan Sivil ,&nbsp;Gilles Mertens","doi":"10.1016/j.marpetgeo.2024.107144","DOIUrl":"10.1016/j.marpetgeo.2024.107144","url":null,"abstract":"","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"170 ","pages":"Article 107144"},"PeriodicalIF":3.7,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592706","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}