Marine and Petroleum Geology最新文献

{"title":"Corrigendum to “Trace and rare earth element signatures in microcrystalline aragonite as indicators of oil vs. methane seepage” [Mar. Pet. Geol. 182 (2025), 107534]","authors":"Yuedong Sun , Shanggui Gong , Jörn Peckmann , Fang Chen , Yao Guan , Dong Feng","doi":"10.1016/j.marpetgeo.2025.107603","DOIUrl":"10.1016/j.marpetgeo.2025.107603","url":null,"abstract":"","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107603"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264999","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":"‘Resurrected’ concretions – their resumed cementation after exhumation, transport, re-deposition and exploitation by producers of the trace fossil Chondrites when still being soft","authors":"Andreas Wetzel ,&nbsp;Maciej Bojanowski","doi":"10.1016/j.marpetgeo.2025.107576","DOIUrl":"10.1016/j.marpetgeo.2025.107576","url":null,"abstract":"<div><div>Incipient concretions having argillaceous matrix and methane-derived cement were exhumed from a low-oxygenated muddy setting, transported and embedded in a fine-sandy tempestite. They were still soft after deposition of the tempestite because subsequently they were preferentially exploited by producers of the trace fossil <em>Chondrites</em>; its tubes are wide-spaced and rare in the tempestite but abundant and narrow-spaced in the concretions. The tubes are filled with fine sand taken from the tempestite. The stable isotope signature of the concretions (δ¹³C −39 to −22 ‰) markedly differs from that of the tempestite (δ¹³C −3 to −2‰). Organoclastic sulfate reduction (OSR) and anaerobic oxidation of methane (AOM) dominated the initial cementation of the concretions. During OSR and AOM, sulfate was reduced to sulfidic phases, including H₂S being toxic to animals. Nonetheless, <em>Chondrites</em> producers exploited the incipient concretions. Because around their tubes are no haloes that would indicate flushing with oxygenated water, the <em>Chondrites</em> producers likely lived in symbiosis with microbes utilizing and detoxicating sulfides and hence, followed a chemichnial behavior. After burrowing ceased, resumed precipitation of early diagenetic micrite filled the remaining porosity of concretions, whereas the tempestite sand was cemented by late diagenetic carbonate.</div><div>Burrowing of the displaced incipient concretions documents their still soft-to-stiff consistency, since they were only partly cemented but resistant to compaction although still in a plastic state, so that they could be burrowed. This fact explains why early diagenetic concretions are rarely found in modern muddy sediments because they are hardly recognized and easily overlooked in modern sediment cores.</div><div>Since coarse near-shore components are lacking, sediment reworking occurred distant from shore on a local swell. There, waves and currents enriched sand while concretions formed in mud underneath/nearby from where they became eroded and displaced by a stronger-than-average storm depositing them in a somewhat deeper area of restricted spatial extent.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107576"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144826637","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":"Geological and geochemical approach to natural hydrogen exploration in the Northern Apennines, Italy","authors":"Vivian Azor de Freitas ,&nbsp;Alessandra Montanini ,&nbsp;Isabelle Moretti ,&nbsp;Andrea Artoni ,&nbsp;Stefano Segadelli ,&nbsp;Jean de la Paix Izerumugaba ,&nbsp;Anne Battani ,&nbsp;Giuseppe Etiope","doi":"10.1016/j.marpetgeo.2025.107594","DOIUrl":"10.1016/j.marpetgeo.2025.107594","url":null,"abstract":"<div><div>The western sector of Northern Apennines, Italy, presents favorable conditions for the occurrence of natural hydrogen (H₂), hosting ophiolitic bodies, hyperalkaline waters, and deep-seated faults. A geological and geochemical investigation was conducted to evaluate the potential for subsurface H₂ accumulations. The study involved gas analyses from spring waters, bubbling gas, and soil-gas measurements, along with petrographic analyses of ultramafic rocks. Multiple springs contain dissolved H₂ at low (up to 1 μM) to moderate (1 μM–100 μM) concentrations relative to other springs in serpentinized peridotites worldwide. In the Taro Valley, H₂ occurrences (0.28 μM–0.79 μM) are associated with hyperalkaline springs in proximity to exposed peridotites. However, the limited thickness of the peridotite body at Mt. Prinzera (∼250 m) suggests that the hyperalkaline water and associated H₂ likely derive from deeper unexposed ultramafic units. Petrographic analyses of spinel-peridotites reveal varying degrees of serpentinization (45 %–95 %), characterized by serpentine mesh textures with olivine relics, pyroxene converted into serpentine, and formation of magnetite and chromite. In the Bobbio Tectonic Window, springs with neutral pH waters, located away from exposed ultramafic bodies, contain higher concentrations of dissolved H₂ (0.49 μM–3.8 μM). Although the origin of this H₂ remains unclear, it may be related to hidden ultramafic bodies within the sedimentary sequence undergoing serpentinization. Notably, all the spring-related H₂ occurrences are associated with methane (CH₄), showing thermogenic isotopic signatures (<em>δ</em>¹³C: 58.3 ‰ to −35 ‰ and <em>δ</em>²H: 200 ‰ to −145 ‰). Further research should focus on the characterization of regional hydrocarbon reservoirs, which could also host natural H₂.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107594"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018400","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":"Integrated seismic stratigraphic, sedimentological and petrophysical approaches for characterizing the Cenomanian reservoirs in transitional highs of north Western Desert intra-cratonic rift basins, Egypt","authors":"Ahmed Awadalla ,&nbsp;Ali Farag ,&nbsp;Andrea Moscariello ,&nbsp;Mahmoud Leila","doi":"10.1016/j.marpetgeo.2025.107581","DOIUrl":"10.1016/j.marpetgeo.2025.107581","url":null,"abstract":"<div><div>The Cenomanian Bahariya Formation is the most prolific hydrocarbon reservoir within the Mesozoic intra-cratonic rift basins of the Egyptian Western Desert. However, it remains under-explored in the transitional structural highs bordering these basins. These transitional regions host thin hydrocarbon pay zones in the sandstones of the Bahariya Formation. These sandstones exhibit pronounced petrophysical heterogeneity, which poses significant challenges to reservoir characterization and prediction, and their depositional characteristics and controls on the reservoir facies distribution have never been investigated. This study employs an integrated approach utilizing seismic stratigraphy, sedimentary facies analysis and petrophysics to establish the relationship between the Bahariya depositional patterns, reservoir rock types, and hydraulic flow units. Understanding these relationships is essential for assessing reservoir performance and identifying high-quality reservoir intervals for future exploration and production in these transitional regions. The studied core intervals comprise the Upper Bahriya reservoirs in two wells (Wadi El-Rayan-3X “WR-3X″ and Rayan-3X “R-3X”). The cored intervals consist mainly of sixteen sandstone, mudstone and siltstone lithofacies that were grouped into nine facies associations (FA) deposited in a muddy tide-dominated estuarine environment. Sandstone lithofacies were preferentially accumulated in narrow (&lt;1 km width) tidal channels (FA2) and sub-tidal bars (FA3). The sandstones of FA2, FA3 were classified as reservoir rock types (RRTs) 1 and 2 (RRT1, RRT2) with best reservoir characteristics and contribute to more than 90 % of the flow capacity of the Upper Bahariya reservoir. Conversely, mixed tidal flats (FA1) and intertidal sand bars (FA4) exhibit the poorest reservoir quality with pore system dominated by micropores and mesopores and act as effective fluid flow barriers. Petrophysical heterogeneity analysis indicates that sandstone lithofacies deposited within the outer estuarine tidal channels and subtidal bar environments exhibit the lowest degree of pore system heterogeneity. These facies are characterized by the dominance of well-connected macropores. The present results underscore the inherent heterogeneity of tide-dominated estuarine systems, where rapid lateral and vertical facies transitions, driven by fluctuating tidal energy and sediment supply, create complex reservoir architectures. Despite this complexity, the study demonstrates that higher-quality reservoir facies tend to preferentially accumulate in zones subjected to stronger tidal currents—specifically in the outer estuarine domain.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107581"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144842653","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":"Enhancing reservoir parameter prediction workflows via advanced core data augmentation","authors":"Xin Luo ,&nbsp;Xinghua Ci ,&nbsp;Jianmeng Sun ,&nbsp;Chengyu Dan ,&nbsp;Peng Chi ,&nbsp;Ruikang Cui","doi":"10.1016/j.marpetgeo.2025.107605","DOIUrl":"10.1016/j.marpetgeo.2025.107605","url":null,"abstract":"<div><div>Machine learning models that rely on core data as dataset labels have become a mainstream method for predicting reservoir parameters. However, the high costs and insufficient spatial sampling density associated with core data acquisition often result in weak nonlinear representation, poor generalization ability, and overfitting in these models. To address limited core data challenges, we propose a reliability analysis-driven workflow that optimally selects multiple core data augmentation (CDA) methods to enhance reservoir parameter prediction. This workflow achieves two primary advancements: Firstly, it mitigates data scarcity by treating core data as a minority class and applying diverse tabular data augmentation techniques to generate and rigorously evaluate reliable synthetic data. This effectively expands the useable core dataset. Secondly, leveraging this augmented data, the workflow integrates machine learning with pre-trained language models (PLMs) to develop and apply multiple combinations of augmentation-prediction models for both lithology classification and physical property parameter prediction. Field data applications demonstrate that the combination of Tabular Denoising Diffusion Probabilistic Model (TabDDPM) and Tabular Prior Data Fitting Network (TabPFN) in CDA achieves outstanding performance in evaluation metrics and case studies for lithology classification and petrophysical parameter prediction. This study provides a reproducible framework for enhancing small-sample reservoir parameter prediction in oil and gas exploration, proving that synthetic data augmentation can effectively mitigate data scarcity and open new pathways for geophysical data analysis.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107605"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145094966","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":"Mechanisms for initiation and termination of extraordinarily high total organic carbon in the Longmaxi Formation, Yangtze Platform, South China","authors":"Zongyuan Sun ,&nbsp;Hao Chen ,&nbsp;Xianguo Lang ,&nbsp;Bolin Zhang ,&nbsp;Qing Chen ,&nbsp;Kun Zhao ,&nbsp;Shengxian Zhu ,&nbsp;Fangqi Zhao ,&nbsp;Feng Liang ,&nbsp;Chuyuan Liu ,&nbsp;Junxuan Fan","doi":"10.1016/j.marpetgeo.2025.107588","DOIUrl":"10.1016/j.marpetgeo.2025.107588","url":null,"abstract":"<div><div>The Early Silurian Longmaxi Formation in the Yangtze Platform of South China hosts exceptional shale gas reservoirs, particularly in intervals where total organic carbon (TOC) exceeds 3 wt%. However, the initial TOC values and termination timing of these “extraordinarily high TOC” intervals differ markedly among localities, especially between inner- and outer-shelf settings. In this study, we integrate graptolite biostratigraphy, carbon isotope chemostratigraphy, and multiple geochemical proxies (e.g., major–trace elements and sulfur isotopes) from drill cores in Yichang, Hubei Province, South China (outer shelf). We establish a refined chronostratigraphic framework, identifying an extraordinarily high TOC interval (&gt;3 wt%) and a subsequent high TOC interval (2–3 wt%), and then compare these intervals with representative inner-shelf sections. Our results show that at the base of the Longmaxi Formation in Yichang, TOC values are notably lower than those in the inner-shelf Changning area, Sichuan Province, South China, whereas the extraordinarily high TOC interval extends to a higher stratigraphic level in Yichang. Paleoenvironmental proxies indicate that extraordinarily high TOC intervals formed in a euxinic setting with higher primary productivity, and moderate restriction, whereas the high TOC interval reflects an anoxic setting, lower productivity, and stronger restriction. By determining sedimentation rates, sulfur isotope values, paleogeographic setting, and the influence of the Kwangsian Orogeny, we propose two sedimentary models to explain TOC variability in the Longmaxi Formation. The Sedimentation Rate–H₂S Concentration Model highlights how rapid sedimentation and abundant availability of ³⁴S-enriched H₂S promote extraordinarily TOC enrichment in inner-shelf settings, while slower burial and limited H₂S availability inhibit TOC accumulation in outer-shelf locations. The Kwangsian Orogeny–Hydrographic Restriction Model associates tectonic uplift with enhanced hydrographic restriction, reducing sulfate supply and driving the diachronous termination of high TOC intervals across the platform. These insights refine our understanding of early Silurian black-shale deposition and offer practical guidance for future shale-gas exploration in South China.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107588"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988702","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":"Facies architecture and depositional evolution of an Eocene tropical, shallow-marine, larger-benthic-foraminifera-dominated carbonate ramp, India","authors":"Sreetama Aich,&nbsp;Sudipta Dasgupta,&nbsp;Santanu Banerjee,&nbsp;Kumar Hemant Singh","doi":"10.1016/j.marpetgeo.2025.107582","DOIUrl":"10.1016/j.marpetgeo.2025.107582","url":null,"abstract":"<div><div>In contrast to the most cited carbonate ramp models, the middle Eocene Bombay Offshore Basin developed a unique facies association characterised by its depositional architecture. Based on the textural fabric and the significant biotic assemblages, seven sedimentary lithofacies and sixteen microfacies were classified and grouped into five facies associations that include: i) mid-ramp (FA I), ii) inner-ramp back-shoal (FA II), iii) inner-ramp fore-shoal (FA III), iv) inner-ramp shoal (FA IV), and v) inner-ramp sheltered-lagoon (FA V). Inter-well correlation depicts a heterogeneous mosaic distribution pattern of the depositional subenvironments, which, along with their respective depositional significances, leads us to develop an atypical depositional model for this shallow carbonate ramp deposit. The vertical sedimentary trends propose that several lower-order regressions overprint the basin-scale nth-order middle Eocene transgression. The succession is thus further subdivided into five (n+1)^th-order sequences (SQ I-V) and categorises the sedimentary evolution of the Bassein Formation into two phases. An initial mid-ramp setting (phase I) of the Lower Bassein Member is represented by the retrogradational or deepening-upward sequences of the platform development, followed by the deposition of the Middle and Upper Bassein members, defined by the consistent shallowing upward cycles during the late middle Eocene within the inner ramp, separated by a maximum flooding surface. Phase II of the studied formation shows complex depositional heterogeneity, where the low-energy backshoal and sheltered lagoon subenvironments contain heterogeneous intermittent intercalations of the higher energy bioclastic shoal bars and fore-shoal deposits. This heterogeneous mosaic microfacies distribution within a shallow-marine carbonate ramp deposit is attributed to the autogenic controls overprinting the allogenic controls. Further, the unique larger benthic foraminiferal assemblage of the formation provides a reasonable comparison with other contemporaneous carbonate platforms in the Circum-Tethyan belt, such as those in Oman and Iran, and offers a global analogue variant for the Eocene platform carbonates.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107582"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852018","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":"Hydrothermal structures in alkaline lake shales, the Permian Fengcheng Formation of the Junggar Basin, NW China","authors":"Kai Zhong ,&nbsp;Pei Guo ,&nbsp;Zhiming Li ,&nbsp;Jian Wang ,&nbsp;Wangwei Liu ,&nbsp;Baozhen Zhang ,&nbsp;Meiyuan Song ,&nbsp;Changzhi Li ,&nbsp;Jinghong Xu","doi":"10.1016/j.marpetgeo.2025.107578","DOIUrl":"10.1016/j.marpetgeo.2025.107578","url":null,"abstract":"<div><div>This study investigates how hydrothermal activity since early diagenetic stage can alter continental shale properties by focusing on the alkaline lake shales of the Late Paleozoic Fengcheng Formation in the Junggar Basin, NW China. By utilizing core and thin section observations, cathode luminescence investigations, and in-situ carbon, oxygen, and strontium isotopic analyses, the formation mechanisms of the abundant white carbonate mineral-filled structures have been studied. Four distinct types of white structures are recognized: Type-1 calcite-filled (sub)horizontal bands, Type-2 calcite-filled speckles, Type-3 dolomite-filled speckles and Type-4 dolomite-filled root-like structures. The blocky calcite in Type-1 and Type-2 structures shows dark luminescence, slightly positive carbon isotopes (+0.2 ‰ to +2.38 ‰), moderately negative oxygen isotopes (−10.53 ‰ to −7.59 ‰) and very low ⁸⁷Sr/⁸⁶Sr ratios (0.705136 to 0.705740). The dolomite in Type-3 and Type-4 structures shows dark red to green luminescence, moderately positive oxygen isotopes (+3.04 ‰ to +3.98 ‰), negative carbon isotopes (−13.64 ‰ to −8.42 ‰) and very low strontium isotopes (0.705453 to 0.705903). We interpret that the Type-1 and Type-2 structures were related to hydrothermal activity that introduced recycled meteoric waters into shallow buried sediments, induced horizontal vein formation, and led to the dilution and calcification of sodium-carbonate evaporite minerals. The Type-3 and Type-4 structures were also induced by hydrothermal activity that introduced deep-sourced hydrothermal fluids into shallow to deep burial sediments, leading to the dilution and dolomitization of sodium-carbonate evaporite minerals and molar tooth structures in shales. These hydrothermally-influenced structures can increase carbonate mineral contents, reservoir space and fluid transport pathways, significantly impacting the reservoir properties of shales.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107578"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144826646","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":"Molecular migration tracers and basin modeling reconstruct the initial filling of the Ivar Aasen, Edvard Grieg, Solveig, and Johan Sverdrup fields of the Haugaland High, Norwegian North Sea","authors":"Thorsten Uwe Garlichs ,&nbsp;Lorenz Schwark","doi":"10.1016/j.marpetgeo.2025.107589","DOIUrl":"10.1016/j.marpetgeo.2025.107589","url":null,"abstract":"<div><div>An integration of geological, geochemical, and geophysical disciplines into a classical basin model is the key for a profound understanding of the migration and filling history of reservoirs in the Haugaland High, North Sea, as it delineates the generation, expulsion, and migration of hydrocarbons. The numerical basin model for migration assessment was tuned and calibrated with molecular geochemical data, especially by the application of benzocarbazole ratios as migration tracers and geochemical fingerprinting of oil families. Benzocarbazole distributions resolved the complex filling history and the initial filling directions of different migration sectors for the Haugaland High via their decreasing [a]/([a]+[c]) isomer ratios. These decline with increasing migration distance for different migration sectors extracted by a numerical basin model. The filling history was reconstructed as a complex multicharge system in a context of variable stages of paleobiodegradation. Hereby, benzocarbazole ratios obtained from oils and reservoir core extracts remained unaffected by biodegradation. They indicate an oil migration trend from the Viking Graben in the west of the Haugaland High towards the southeast, filling the present-day fields, e.g., Johan Sverdrup, Edvard Grieg, and Ivar Aasen. Benzocarbazole distributions represent the initial filling and do not show overprint effects by later and mature charges of oil lean in polar constituents. They thus exhibit a migration scenario in agreement with migration reconstruction via numerical basin modelling and previously proposed non-polar biomarker distributions.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107589"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145044502","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":"Chronological and geochemical constraints on the origin and timing of carbonate-cemented sandstones in the Middle Jurassic Zhiluo Formation, northeastern Ordos Basin, China","authors":"Yang Qin ,&nbsp;Chiyang Liu ,&nbsp;Junfeng Zhao ,&nbsp;Yanping Ma ,&nbsp;Lihua Yang ,&nbsp;Nan Du","doi":"10.1016/j.marpetgeo.2025.107595","DOIUrl":"10.1016/j.marpetgeo.2025.107595","url":null,"abstract":"<div><div>The northeastern Ordos Basin experiences significant natural gas dissipation. As key geological archives for deciphering hydrocarbon migration-dissipation processes, the genesis and timing of carbonate-cemented sandstones (CCSs) from the Zhiluo Formation (northeastern Ordos Basin) remain controversial and lack systematic investigation. In this study, we conducted a comprehensive investigation of CCSs, integrating petrographic characterization, in situ rare earth element (REE) and U-Pb geochronological analyses, coupled with C-O-Sr isotope and fluid inclusion studies. The CCSs represent non-syndepositional diagenetic products with three stages: Calcite 1 (147.4–125 Ma), Calcite 2 (119.78–100.9 Ma), and Calcite 3 (71.84–61.9 Ma). Calcite crystallinity progressively increases from Calcite 1 to 3, with distinct geochemical signatures across stages. The Calcite 1 generation predominantly originated from chemical precipitation during supergenic diagenesis, with diagenetic fluids dominated by alkaline-enriched external surface water. The formation of Calcite 2–3 was controlled by the amalgamation of deep-sourced hydrothermal fluids and hydrocarbon migration-dissipation. Notably, Calcite 2 also records superimposed supergene alteration involving terrigenous inputs, which serves as an intermediate diagenetic product. Hydrocarbon inclusions, which are ubiquitously hosted within Calcites 2–3, exhibit high thermal maturity, and the gas within inclusions has genetic affinity with Upper Paleozoic coal-derived natural gases from the Hangjinqi-Sulige field. This genetic linkage directly and compellingly indicates that Upper Paleozoic gas migration-dissipation served as the predominant light carbon source for Calcites 2–3 precipitation. The onset of Upper Paleozoic gas migration-dissipation occurred during the late Early Cretaceous, which may have persisted until present. Approximately 44.66 % of the organic-derived calcite proportion provides conclusive evidence for large-scale gas migration-dissipation.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"182 ","pages":"Article 107595"},"PeriodicalIF":3.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145044503","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}