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Internal architecture characterization of carbonate reservoirs and its geological significance for reservoir development:A case study of Cretaceous Main Mishrif Formation in H oilfield,the Middle East 认领 引用
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作者 QIAO Zhanfeng ZHU Guangya +4 位作者 SHAO Guanming FAN Zifei SUN Xiaowei ZHANG Yu NING Chaozhong 《Petroleum Exploration and Development》 SCIE 2026年第2期343-358,共16页
This study investigates the strong heterogeneity and complex internal architecture of carbonate reservoirs,using the Cretaceous Main Mishrif Formation in the Middle East as an example.A multi-scale characterization of... This study investigates the strong heterogeneity and complex internal architecture of carbonate reservoirs,using the Cretaceous Main Mishrif Formation in the Middle East as an example.A multi-scale characterization of sedimentary architecture is conducted based on reservoir genetic analysis.Quantitative calibration of well logs with core thin sections enables semi-quantitative evaluation of dissolution intensity in non-cored intervals.Within a coupled depositional-diagenetic framework,reservoir classification is established with depositional-diagenetic facies as the linking framework,allowing delineation of their spatial distribution and connectivity.The results show that three types of architectural units are developed in the Main Mishrif Formation,including tidal channels,bioclastic shoals,and tidal bioclastic deltas,which exhibit fining-upward,coarsening-upward,and coarsening-upward–fining-upward successions,respectively.These units form two composite stacking patterns,namely the“encapsulated”pattern and the“upper-lower”pattern.A dissolution intensity index is defined based on thin-section analysis,and a log-based prediction model is developed using principal component analysis and multivariate regression.Dissolution in the MB2 sub-member is controlled by third-order sequence boundaries,with strong dissolution occurring from MC1-1 to MB2-1,forming high-permeability zones across architectural units.In contrast,dissolution in the MB1 sub-member is controlled by high-frequency sequences,with stronger dissolution in the upper intervals,favoring the development of high-permeability zones.By combining depositional and dissolution characteristics,a total of 21 depositional-diagenetic facies are identified,and the distributions of high-permeability zones,high-quality,moderate,and poor reservoirs,as well as interlayers are systematically characterized.These findings provide a geological basis for stratified reservoir development,well pattern optimization,and remaining oil recovery in carbonate reservoirs,and are promising for the characterization of giant thick carbonate reservoirs in the Middle East and Central Asia. 展开更多
关键词 carbonate rock reservoir internal architecture reservoir characterization reservoir development Cretaceous Middle East Persian Gulf Basin Mesopotamian Basin
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Characteristics and Genesis of Fine-Grained Clastic Reservoirs in the Huangliu Formation Ultra-Low-Pressure Permeable Gas Reservoir in the Dongfang Area of Yinggehai Basin 认领 引用
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作者 ZHOU Wei ZHANG Hui +4 位作者 ZHANG Chong MENG Di GUAN Yao QIN Lijuan YANG Rui 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第3期863-880,共18页
This study focused on the overpressured low-permeability gas reservoirs of the Huangliu formation in the Dongfang area of Yinggehai Basin,northern South China Sea,with an emphasis on the controlling mechanisms of the ... This study focused on the overpressured low-permeability gas reservoirs of the Huangliu formation in the Dongfang area of Yinggehai Basin,northern South China Sea,with an emphasis on the controlling mechanisms of the reservoir’s physical properties under high-temperature,high-pressure geological conditions.A suite of integrated experimental techniques,including laser particle size analysis,X-ray diffraction,high-pressure mercury intrusion,and nuclear magnetic resonance,was used to comprehensively characterize the rock fabric and pore structure of fine-grained clastic reservoirs.Results indicated that depositional processes constituted the fundamental control on reservoir quality.Grain size and clay content jointly determined permeability variations,with the best reservoir properties developed in high-energy channelized depositional microfacies.The overpressure regime significantly altered diagenetic pathways:on the one hand,it effectively inhibited destructive processes such as mechanical compaction and carbonate cementation,thereby preserving primary intergranular pores;on the other hand,high-temperature,high-pressure conditions enhanced dissolution,leading to the development of secondary pore space.The study further demonstrated that the transformation and enrichment of clay minerals within the fine-grained matrix,particularly authigenic chlorite,represented the key microscopic mechanism responsible for the sharp reduction in reservoir permeability.Overall,this research elucidated a complex genetic mechanism for fine-grained reservoirs under overpressure conditions,characterized by‘deposition-controlled framework,overpressure-driven pore preservation,and clay-related permeability degradation’.Herein,a geology-driven reservoir quality evaluation concept is proposed,providing an important theoretical basis for favorable reservoir prediction and the economically efficient development of similar high-temperature,overpressured,low-permeability offshore gas reservoirs. 展开更多
关键词 Yinggehai Basin low-permeability reservoirs overpressure reservoir genesis clay minerals pore structure finegrained clastic rock
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Diagenetic controls on reservoir quality in deep ultra-thick sandstones:A case study from the Huagang Formation,Xihu Depression,East China Sea 认领 引用
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作者 Daowu Huang Yixiu Zhu +4 位作者 Zhaoliang Yan Xianke He Chengshan Li Chuangxin Liu Binbin Liu 《Energy Geoscience》 EI CAS CSCD 2026年第1期148-165,共18页
Tight sandstone reservoirs represent a pivotal unconventional oil and gas production target.The upper section of the deeply buried Huagang Formation in the Xihu Depression is abundant in hydrocarbons and forms a tight... Tight sandstone reservoirs represent a pivotal unconventional oil and gas production target.The upper section of the deeply buried Huagang Formation in the Xihu Depression is abundant in hydrocarbons and forms a tight reservoir.It exhibits substantial diagenetic variability and strong heterogeneity in sand bodies,which is reflected in variations in physical properties and grain size.Through integrated geological analysis,including rock thin sections,scanning electron microscopy,X-ray diffraction,well logging and production test data,we investigated the diagenesis,reservoir formation mechanisms,and controlling factors of high-quality reservoirs within the superposed sandstone bodies exceeding 100 m thick in the deeper Huagang Formation.We also studied the formation characteristics of these ultrathick sandstones,clarifying that diagenesis and post-depositional modification are crucial for developing high-quality reservoirs in this formation.Our findings indicate that the sandstone underwent compaction,cementation(by chlorite,calcite and quartz),dissolution(of K-feldspar and carbonate cement),and authigenic clay mineral cementation(such as illite,chlorite,kaolinite).Multiple dissolution zones are present within the thick sandstone units.The distribution of these dissolution zones is mainly controlled by temperature and sandstone composition.With increasing temperature,acidic fluids derived from coal-bearing strata and early hydrocarbon source rocks promoted feldspar dissolution.The thick sandstone units in different intervals of varying depths are at various diagenetic stages.The petrophysical zoning of the reservoir is collectively controlled by diagenetic facies dominated by sedimentation,compaction,and dissolution processes.These findings provide valuable guidance and reference for oil and gas exploration and development in this area,particularly within the ultra-thick sandstone layers. 展开更多
关键词 Reservoir heterogeneous Diagenesis Ultra-thick sandstone High-quality reservoir Huagang Formation Xihu Depression East China Sea Basin
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Landslides with multi-slip surfaces in reservoir areas:Occurrence and geomorphic and geological controls 认领 引用
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作者 Jian Wang Xinli Hu +5 位作者 Ningjie Li Hongchao Zheng Zongxing Zou Chu Xu Lifei Niu Yu Tao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5292-5308,共17页
Reservoir landslides represent a significantgeohazard in the context of global hydropower expansion,particularly those with multiple slip surfaces.However,the regional occurrence and controlling factors of multi-slip ... Reservoir landslides represent a significantgeohazard in the context of global hydropower expansion,particularly those with multiple slip surfaces.However,the regional occurrence and controlling factors of multi-slip surface landslides(MSSLs)remain poorly understood,posing challenges for hazard prediction and mitigation.In this study,we have undertaken a comprehensive inventory of MSSLs based on geological investigations in the Three Gorges reservoir area,China,over the past two decades,and evaluated the geomorphic and geological controls on their distribution and process mechanisms.The results indicated that MSSLs are unevenly clustered along the bank slopes of the Yangtze River and near fold cores,displaying distinct types and developmental characteristics across three subregions of different topography and lithology settings.The combined effects of river erosion,geological structures,and bedrock with weak layers largely determine their occurrence.In contrast,the impacts of topography and distance to faults are moderate or negligible.MSSLs showed a distinct preference for specificstrata(T2b and J2s)and slope intervals(15°-25°),where their proportion was approximately twice that of all landslides in the same range.These landslides are commonly composite deposits formed through multistage mass movements during valley geomorphic processes,driven by the interplay of episodic tectonic uplift,river incision,and paleoclimatic changes since the Middle Pleistocene.We proposed conceptual models for their multistage evolution,emphasizing the significanceof lithology and slope structure in governing MSSL evolution,and further explaining the spatial variability in MSSL distribution patterns.The findingscontribute significantlyto the early identification,hazard prevention,and mitigation in MSSL-active areas. 展开更多
关键词 Reservoir landslide Multi-slip surface landslides(MSSLs) Three Gorges reservoir area Geomorphic and geological controls
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Diagenesis and implication for the reservoir quality of the tight sandstone reservoir in the depression zone of foreland basin,Upper Triassic Xujiahe Formation,Western Sichuan Foreland Basin,China:Evidence from petrography and geochemistry 认领 引用
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作者 Peng Huang Ming-Jie Liu +1 位作者 Bo Cao Zi-Long Wang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期1650-1674,共25页
Tight sandstones are products of complex and various diagenetic events that significantly affect reservoir quality and heterogeneity.In this study,tight sandstones of the Upper Triassic Xu3 Member in the Western Sichu... Tight sandstones are products of complex and various diagenetic events that significantly affect reservoir quality and heterogeneity.In this study,tight sandstones of the Upper Triassic Xu3 Member in the Western Sichuan Foreland Basin were examined as a case study.Petrographic and geochemical analyses were combined to investigate diagenetic variability and its effects on reservoir quality.The sandstone in this zone consisted of coarse-grained to siltstone-grained poorly to moderately sorted sublitharenite and litharenite.And the sandstone exhibits poor physical properties.The diagenesis during the eodiagenetic stage included compaction,dissolution,early-stage quartz cementation,earlystage carbonate cementation(calcite and dolomite),and kaolinite formation.The mesodiagenetic stage encompassed compaction,dissolution,late-stage quartz cementation,intermediate-and late-stage carbonate cementation(ferro-calcite,ankerite,and calcite in fractures),and clay cementation(kaolinite,illite,and chlorite).Compaction destroyed the tight sandstone reservoir to a greater degree than cementation.Specifically,compaction and cementation reduced the initial porosity by 80.70%and 15.50%,respectively.Dissolution emerges as primary constructive diagenesis,promoting the formation of authigenic minerals.The vertical variability in dissolution and cementation within the cycle contributed to increased reservoir heterogeneity.Relatively high-quality reservoirs in the sandstone overlaying sandstone style occurred at the base of the cycle.In the mudstone overlaying sandstone style,relatively high-quality reservoirs developed at both the base and the top of the sandstone layers.These findings enhance our understanding of diagenetic influences on reservoir properties and the distribution of high-quality reservoirs.Consequently,they offer valuable insights for advancing unconventional oil and gas exploration in depression zones of foreland basins. 展开更多
关键词 Tight sandstone reservoirs Diagenesis Reservoir quality Xujiahe Formation Foreland basin
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Surface-water-area anomalies in the Danjiangkou Reservoir’s autumn impoundment linked to climate drivers and teleconnection mechanisms during 1986–2023 认领 引用
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作者 LI Shuangshuang HE Mingyang LI Xingyi 《Journal of Geographical Sciences》 SCIE CSCD 2026年第4期897-918,共22页
Based on optical remote sensing,two challenges should be highlighted in research on reservoir water resources in mountainous areas:(1)the isolation of climatic influences from anthropogenic impacts during impoundment ... Based on optical remote sensing,two challenges should be highlighted in research on reservoir water resources in mountainous areas:(1)the isolation of climatic influences from anthropogenic impacts during impoundment periods,and(2)the discernment of circulation mechanisms to improve early-warning-system capabilities against extreme climate events.To address these challenges,we developed an enhanced automated water-detection framework using Landsat TOA data(1986-2023)that allowed us to analyse the spatiotemporal variations and driving factors of the water surface area of the Danjiangkou(DJK)Reservoir-China’s key source of the South to North Water Diversion.The results showed that anthropogenically induced changes in water surface area were evident through infrastructure developments,notably the increase in the height of the DJK dam(contributing 34.0%of the variance)and the construction of the Wangfuzhou Hydrojunction(contributing 51.9%of the variance).Following ensemble empirical mode decomposition and first-order difference detrending to reduce the impacts from human activity,a significantly enhanced positive(negative)correlation between autumn precipitation(potential evaporation)and water surface area was revealed;this demonstrated the climate-driven controls on reservoir dynamics at the interannual and decadal scales.Importantly,atmospheric pressure anomalies over the Tibetan Plateau and the area of the Asian polar vortex are two effective indicators of autumn precipitation anomalies for the DJK Reservoir.Our research framework has the potential to support the development of early warning systems,which have direct applications to the DJK Reservoir and,more broadly,to reservoir systems across Eurasia. 展开更多
关键词 climate change surface water detection spatiotemporal analysis reservoir management Danjiangkou Reservoir
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Multi-source and multi-attribute collaborative fracture network modeling of a sandstone reservoir in Ordos Basin 认领 引用
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作者 Yinbang Zhou 《Energy Geoscience》 EI CAS CSCD 2026年第1期214-223,共10页
The effective channeling of fluid flow by fractures is a liability for enhanced oil recovery(EOR)methods like CO2 flooding or CO2 storage.Developing a distributed fracture model to understand the heterogeneity o... The effective channeling of fluid flow by fractures is a liability for enhanced oil recovery(EOR)methods like CO2 flooding or CO2 storage.Developing a distributed fracture model to understand the heterogeneity of the fracture network is essential in characterizing tight and low-permeability reservoirs.In the Ordos Basin,the Chang 8-1-2 layer of the Yanchang Formation is a typical tight and low permeability reservoir in the JH17 wellblock.The strong heterogeneity of distributed fractures,differing fracture scales and fracture types make it difficult to effectively characterize the fracture distribution within the Chang 8-1-2 layer.In this paper,multi-source and multi-attribute methods are used to integrate data into a neural network at different scales,and fuzzy logic control is used to judge the correlation of various attributes.The results suggest that attribute correlation between coherence and fracture indication is the best,followed by correlations with fault distance,north–south slope,and north–south curvature.Advantageous attributes from the target area are used to train the neural network,and the fracture density model and discrete fracture network(DFN)model are built at different scales.This method can be used to effectively predict the distribution characteristics of fractures in the study area.And any learning done by the neural network from this case study can be applied to fracture network modeling for reservoirs of the same type. 展开更多
关键词 Tight oil reservoir CO2flooding CO2storage Reservoir fracture Fracture network modeling Fracture density
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Geomodelling of multi-scenario non-stationary reservoirs with enhanced GANSim 认领 引用
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作者 SONG Suihong MUKERJI Tapan +2 位作者 SCHEIDT Celine ALQASSAB Hisham M FENG Man 《Petroleum Exploration and Development》 SCIE 2026年第1期205-220,共16页
GANSim is a generative adversarial networks(GANs)-based geomodelling framework with direct conditioning capabilities.To extend GANSim for geomodelling of multi-scenario and non-stationary reservoirs,and to address its... GANSim is a generative adversarial networks(GANs)-based geomodelling framework with direct conditioning capabilities.To extend GANSim for geomodelling of multi-scenario and non-stationary reservoirs,and to address its tendency to overlook single-pixel well facies conditioning data that can cause local facies disconnections around wells,an enhanced GANSim framework is proposed.The effectiveness of the enhanced GANSim is validated using a 3D multi-scenario,non-stationary turbidite fan reservoir.For reservoirs that may involve multiple geological scenarios,two GANSim geomodelling workflows are proposed:(1)training a comprehensive GANSim model that covers all possible geological scenarios;and(2)first performing geological scenario falsification and then training GANSim models only for the unfalsified scenarios.On this basis,a local discriminator architecture is designed to improve facies continuity around wells.The modelling results show that both workflows can generate non-stationary facies models that conform to expected geological patterns and honor conditioning data,and the facies discontinuity issue around wells is effectively resolved.Compared with multipoint geostatistical methods(SNESIM),GANSim exhibits superior capability in reproducing geological patterns and modelling efficiency.Although GANSim requires a long training time,once training is completed,it can be applied to geomodelling reservoirs of arbitrary scale with similar geological structures,achieving modelling speeds approximately 1000 times faster than SNESIM. 展开更多
关键词 reservoir geomodelling generative adversarial networks(GANs) enhanced GANSim scenario falsification non-stationary reservoirs turbidite fan
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Reservoir fluid type identification method based on deep learning:A case study of the Chang 1 Formation in the Jiyuan oilfield of the Ordos basin,China 认领 引用 被引量：1
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作者 Wen-bo Li Xiao-ye Wang +4 位作者 Lei He Zhen-kai Zhang Zeng-lin Hong Ling-yi Liu Dong-tao Li 《China Geology》 CAS CSCD 2026年第1期60-74,共15页
With the efficient and intelligent development of computer-based big data processing,applying machine learning methods to the processing and interpretation of logging data in the field of geophysical well logging has ... With the efficient and intelligent development of computer-based big data processing,applying machine learning methods to the processing and interpretation of logging data in the field of geophysical well logging has broad potential for improving production efficiency.Currently,the Jiyuan Oilfield in the Ordos Basin relies mainly on manual reprocessing and interpretation of old well logging data to identify different fluid types in low-contrast reservoirs,guiding subsequent production work.This study uses well logging data from the Chang 1 reservoir,partitioning the dataset based on individual wells for model training and testing.A deep learning model for intelligent reservoir fluid identification was constructed by incorporating the focal loss function.Comparative validations with five other models,including logistic regression(LR),naive Bayes(NB),gradient boosting decision trees(GBDT),random forest(RF),and support vector machine(SVM),show that this model demonstrates superior identification performance and significantly improves the accuracy of identifying oil-bearing fluids.Mutual information analysis reveals the model's differential dependency on various logging parameters for reservoir fluid identification.This model provides important references and a basis for conducting regional studies and revisiting old wells,demonstrating practical value that can be widely applied. 展开更多
关键词 Low-contrast reservoirs Fluid types Pore structure Clay content LR+NB+GBDT+RF+SVM model Machine learning Neural networks Loss functions Geophysical well logging Oil and gas reservoir prediction
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Coupled thermo-hydro-mechanical-damage modeling of cold-water injection in deep geothermal reservoirs 认领 引用 被引量：3
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作者 Liyuan Liu Yaohui Li +3 位作者 Wenzhuo Cao Tao Wang Le Zhang Xianhui Feng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期39-54,共16页
Rock damage significantly affects coupled thermo-hydro-mechanical(THM)behavior in deep geothermal exploitation through changing thermal and hydrological properties of rocks.For this,a thermo-hydro-mechanical-damage(TH... Rock damage significantly affects coupled thermo-hydro-mechanical(THM)behavior in deep geothermal exploitation through changing thermal and hydrological properties of rocks.For this,a thermo-hydro-mechanical-damage(THMD)coupled model was developed to describe the coupling between rock damage and mechanical,fluid flow and heat transfer fields.The model considers rock heterogeneity,and incorporates the Mohr-Coulomb failure criterion and the maximum tensile stress criterion to evaluate shear and tensile damage.This numerical modeling methodology was first verified against analytical solutions and experimental results,and was then used to simulate the THMD coupling behavior in deep geothermal exploitation.A coupled numerical model was set up to simulate the geothermal fluids extraction and re-injection process in a reservoir at 1 km depth over a 7-year period.Rock damage was found to accelerate the propagation of cold fronts away from the injection well,and have a distinct effect on the performance of geothermal exploitation.When the rock damage was considered,the field injectivity increases by 8.4 times,the range of cooled regions increases by 18.6 times,and the vertical deformation changes by 1.2 times after 7 years of geothermal operations,compared to the scenario where it was not considered.Parametric studies have suggested that thermal contraction dominates the rock damage evolution,and that thermal-induced rock damage only occurs at a sufficiently large temperature difference between fluids injected and the reservoir.This work underscores the importance of accurately accounting for the damage effect on reservoir response during fluid injection activities that cause significant cooling of reservoir rocks. 展开更多
关键词 Thermo-hydro-mechanical-damage (THMD)coupling Rock heterogeneity Geothermal reservoir Rock damage
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Landslide susceptibility assessment integrating deep transfer learning and physical models in the Baihetan reservoir area,China 认领 引用 被引量：1
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作者 Ming Peng Yue Wang +5 位作者 Chenyi Ma Haojie Wang Shaoqiang Meng Zhenming Shi Weijiang Chu Jianrong Xu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4382-4401,共20页
Reservoir landslides pose significant risks to hydropower projects,potentially leading to catastrophic disasters that threaten downstream lives and properties.Landslide susceptibility assessments are critical for effe... Reservoir landslides pose significant risks to hydropower projects,potentially leading to catastrophic disasters that threaten downstream lives and properties.Landslide susceptibility assessments are critical for effective regional disaster prevention and mitigation.However,the complexity,model uninterpretability,and data scarcity related to reservoir landslides,particularly when adapting models across diverse geographic regions,present significant challenges.This study proposes an interpretable Deep Transfer Learning model coupled with multi-source data and Physical methods(DTLP).The model is trained on multi-source data from the Three Gorges Reservoir Area(TGRA)and Lower Jinsha River Basin(LJRB),tested in Baihetan Reservoir Area(BHT),addressing the issues of limited data and cross-regional generalization.The physical method captures the effect of dynamic water level changes on slope stability.SHAP values are used to interpret the model,providing clear insights into its internal mechanisms.Results demonstrate that DTLP outperforms TrAdaBoost in data-scarce regions,achieving higher accuracy(AUC=0.953,Accuracy=0.941)with better feature generalization and susceptibility zone identification.Incorporating dynamic water level changes into the physical model enhances identification of high-susceptibility areas and reduces misclassifications.SHAP analysis indicates that elevation,lithology,and distance to river significantly influence the model decisions.Using TGRA as the source domain further validates the superiority of DTLP framework.However,due to the initial discrepancies between TGRA and the target domain,the transferability is constrained to some extent,resulting in models trained on LJRB data outperforming those trained on TGRA data. 展开更多
关键词 Landslide susceptibility assessment Deep transfer learning Reservoir landslides Infiniteslope model SHAP values
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Experimental techniques for qualitative and quantitative characterization of shale oil reservoir space,minerals,and fluids 认领 引用 被引量：1
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作者 Siyu Chen Zhenkai Huang +6 位作者 Guangyou Zhu Xi Li Zhiyong Chen Ruilin Wang Yue Huang Shengnan Liu Bijun Huang 《Energy Geoscience》 EI CAS CSCD 2026年第2期1-16,共16页
Characterizing shale oil reservoirs encompassing pore space,mineralogy,and fluids is fundamental to effective exploration and development.Recent advances in experimental techniques have significantly improved both the... Characterizing shale oil reservoirs encompassing pore space,mineralogy,and fluids is fundamental to effective exploration and development.Recent advances in experimental techniques have significantly improved both the qualitative and quantitative analysis of these components;however,a comprehensive systematic review is lacking.High-resolution imaging technologies,such as Scanning Electron Microscopy(SEM),Field Emission Scanning Electron Microscopy(FE-SEM),and Focused Ion Beam Scanning Electron Microscopy(FIB-SEM),enable detailed visualization of pore structures.Gas adsorption and high-pressure mercury intrusion methods provide accurate pore-scale quantification.Moreover,techniques like X-ray Diffraction(XRD),X-ray Fluorescence Spectroscopy(XRF),and Electron Probe Microanalysis(EPMA)allow precise mineral identification and compositional analysis.Confocal Scanning Laser Microscopy(CSLM),Raman Spectroscopy,Nuclear Magnetic Resonance(NMR),and Rock Pyrolysis provide insights into fluid occurrence and content within shale reservoirs.Based on a comprehensive review of existing research,this study identifies several key future directions:(1)addressing the challenges of nanopore observation in reservoir space characterization while minimizing the impact of sample preparation on pore structure;(2)improving the accuracy of quantitative mineral analysis and developing advanced new technologies for the precise measurement of complex mineral compositions;(3)enhancing the fluid quantitative evaluation of fluids by more effectively restoring subsurface geological conditions.This paper presents a current synthesis and forward-looking perspective on experimental techniques supporting shale oil exploration,aiming to guide future research and technological innovation in this field. 展开更多
关键词 Experimental technique Shale oil Reservoir space Mineral analysis Fluid characterization Qualitative and quantitative analysis
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Factors influencing the occurrence and distribution of organophosphate esters in sediments by cascade reservoirs of the Wujiang River in Southwest China 认领 引用
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作者 Xiaoying Li Yujie Wang +5 位作者 Yong Qin Yongsheng Chu Xueping Chen Ming Yang Jing Ma Fushun Wang 《Acta Geochimica》 EI CAS CSCD 2026年第2期205-216,共12页
An artificial reservoir,as a temporary host for various materials in a basin,faces the potential risk of organophosphate ester(OPE)enrichment in the sediment.In this study,in order to investigate the impacts of damrel... An artificial reservoir,as a temporary host for various materials in a basin,faces the potential risk of organophosphate ester(OPE)enrichment in the sediment.In this study,in order to investigate the impacts of damrelated water impoundment on OPEs,seven reservoirs in the Wujiang River(WJR)were investigated in January,April,July,and October 2017,and the occurrence and distribution of eight OPEs were evaluated.The results showed that the content of the eight OPEs ranged from 0.83 to 2745 ng/g dw.The main component was tris(2-chloroethyl)phosphate(TCEP).Spatially,the OPEs decreased from upstream to downstream.Temporally,the OPE content showed a trend of July>October≥January>April.Socioeconomic and hydrological factors had significant effects on the distribution of OPEs,and the empirical model of OPEs with gross domestic product(GDP)and reservoir age(RA)as parameters was established.This provided a basis for OPE estimation and treatment direction for the reservoir.In addition,the relevant data regarding OPEs and total organic carbon(TOC)in terrigenous sediments from previous studies showed a significant correlation(r=0.63,P<0.01).The significantly high risk quotient(RQ)estimated for OPEs,especially tris(methylphenyl)phosphate(TMPP)and triphenyl phosphate(TPHP),suggest potential adverse risk. 展开更多
关键词 Organophosphate esters(OPEs) Cascade reservoirs Surface sediment Wujiang River TOC Reservoir hydrology
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A perspective review of applications of the computed tomography(CT)scan imaging technique for microscopic reservoir rock characterization 认领 引用 被引量：1
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作者 Achinta Bera Bharadwaj Shukla Dhruvikkumar Jogani 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期4-27,共24页
In hospitals,a medical computed tomography(CT)scan is used to detect damage to infected areas of the human body.Using this technology,scientists and engineers have found a way to detect the internal pore connections a... In hospitals,a medical computed tomography(CT)scan is used to detect damage to infected areas of the human body.Using this technology,scientists and engineers have found a way to detect the internal pore connections and characterize rock samples of oil and gas reservoirs in the petroleum industry.Nowadays,the micro-CT scan technique is gaining considerable interest in reservoir rock characterization and in situ monitoring of fluid flow through porous media during different flooding experiments.Along with this digital rock physics(DRP)idea,images have been used to accurately describe and model for simulations of rock samples.In this review,the application of micro-CT and medical-CT scanning in the oil and gas industry has been thoroughly discussed.Recent improvements in DRP and modern imaging techniques in the oil and gas industry have been modeled using both experimental and simulation work.The combination of a DRP study and a CT scan has also been discussed as a unique idea for the current scenario of research work in this field.The available literature shows that the modern imaging technique and the DRP concept can enable an understanding of the pore network model.It has also been observed that the visualization of fluid flow behavior through porous media is now possible during fluid movement through the core samples.This review contributes to the new research area and aids those in this field in quickly gaining an understanding of applied image techniques in the oil and gas industry. 展开更多
关键词 computed tomography scanning technology digital rock physics multiphase flow oil and gas industry porous media reservoir characterization
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Diagenetic differences controlled by sediment composition and their implications for reservoir quality in the deep-buried Permian Urho Formation,Fukang Sag,Junggar basin 认领 引用
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作者 Zhicheng Cui Kelai Xi +5 位作者 Xiang Shan Tian Yang Ke Li Weikai Huang Bo Peng Huajun Guo 《Natural Gas Industry B》 2026年第3期300-322,共23页
Deeply buried coarse clastic reservoirs of the Permian Upper Urho Formation in the Fukang Sag,Junggar Basin,exhibit pronounced reservoir-quality heterogeneity in pore systems and lithofacies architecture.However,how p... Deeply buried coarse clastic reservoirs of the Permian Upper Urho Formation in the Fukang Sag,Junggar Basin,exhibit pronounced reservoir-quality heterogeneity in pore systems and lithofacies architecture.However,how provenance-controlled sediment composition regulates mineral transformation and divergent diagenetic pathways,thereby controlling reservoir quality,remains unclear.This study integrates petrographic observations,XRD,SEM,MIP,EPMA,and bulk-and micro-XRF analyses to clarify the diagenetic evolution and the factors controlling reservoir quality in these deposits.The results indicate distinct provenance-controlled diagenetic pathways in two reservoir domains:(1)Reservoirs affected by the Xiquan Uplift Provenance,which contain intermediate-mafic volcanic materials,underwent stronger chemical weathering,enhanced mechanical compaction,and widespread illite-smectite mixed-layer mineral(I/S)cementation,leading to pore systems mainly composed of intercrystalline pores within clay minerals;(2)Reservoirs sourced from the Eastern Provenance,characterized by intermediate-acidic volcanic inputs,exhibit higher textural maturity and better fluid mobility,which favored the formation of early diagenetic authigenic chlorite coatings,the preservation of residual intergranular pores,and the dissolution of laumontite and feldspar;and(3)The alteration of the tuffaceous matrix differed according to diagenetic fluid chemistry.Micro-XRF elemental maps,EPMA oxide compositions,and mineral assemblage trends indicate that K-rich conditions promoted I/S enrichment,whereas Na-rich conditions favored laumontite formation followed by selective dissolution.These contrasting diagenetic pathways exert a first-order control on reservoir-quality heterogeneity.High-quality reservoirs are mainly developed in low-matrix,grain-supported thick sand bodies and sandstone interbeds within conglomerate successions,indicating that facies type,matrix content,and framework support are key screening criteria for reservoir prediction in deeply buried coarse clastic systems. 展开更多
关键词 Provenance Sediment composition Reservoir quality Coarse clastic reservoir Fukang Sag
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Reservoir types and reservoir-forming differentiation of onlap-type carbonate-evaporite paragenetic assemblages:A case study of the second member of the Ordovician Majiagou Formation in the central-eastern Ordos Basin,NW China 认领 引用
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作者 DU Jiansheng XIONG Ying +7 位作者 REN Junfeng ZHONG Shoukang WEI Liubin YU Zhou CAI Wenjie YONG Jingkang TAN Xiucheng LI Ling 《Petroleum Exploration and Development》 SCIE 2026年第2期444-459,共16页
Based on drilling core,thin section,physical property and logging data,taking the second member of the Ordovician Majiagou Formation(Ma 2 Member) in the Ordos Basin as an example,this paper discusses the reservoir typ... Based on drilling core,thin section,physical property and logging data,taking the second member of the Ordovician Majiagou Formation(Ma 2 Member) in the Ordos Basin as an example,this paper discusses the reservoir types,distribution and forming mechanisms of the carbonate-evaporite paragenetic system.The results are obtained in three aspects.First,the Ma 2 Member was deposited in an onlapping pattern toward the Central Paleouplift and is in unconformable contact with the underlying Cambrian around the paleouplift.From the paleouplift to the eastern depression,sedimentary environments such as tidal flat,grain shoal and lagoon,as well as five types of carbonate-evaporite paragenetic sequences,developed in turn.Second,dolomicrite,silt-crystalline dolomite and grain dolomite reservoirs are developed in the Ma 2 Member.According to sedimentary and diagenetic differences,they are further subdivided into four types of reservoir rocks,including mottled silt-crystalline dolomite,grain dolomite,burrow-bearing micritic(silt-crystalline) dolomite,and gypsum-mold-pore-bearing dolomicrite.Among them,grain dolomite reservoirs have superior physical properties and high development frequency,representing the high-quality reservoirs in the study area.Vertically,the reservoirs are mainly developed in the middle and upper parts of high-frequency cycles;laterally,they show a pattern of distribution along sags and around structural highs("along sags and around highs"),characterized by multi-stage superposition and lateral migration.Third,based on the understanding of the sedimentary geomorphic pattern and onlap sedimentary filling model,combined with the lithology,lithofacies distribution and evolution of reservoir rocks,and considering the penecontemporaneous dissolution and dolomitization under high-frequency periodic sea-level cycles,a four-element reservoir-controlling differentiation model of slope geomorphology,particle shoal,dissolution and dolomitization("slope–shoal–dissolution–dolomitization") has been established..The research results can provide a basis for evaluating the exploration potential of hydrocarbon replacement areas in the deep Ma 2 Member of the basin. 展开更多
关键词 onlap filling carbonate-evaporite paragenetic assemblage reservoir characteristics reservoir-forming regularity Ordovician second member of Majiagou Formation Ordos Basin
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Double-crosslinked self-degradable hydrogel for temporary plugging in low temperature reservoirs 认领 引用
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作者 Tai-Heng Yin Yu-Meng Zhu +6 位作者 Yu-Qi Yang Shen-Gen Chen Ji-Rui Chen Yuan-Yuan Lu Han-Yu Guo Tao Wan Jian Liu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1402-1415,共14页
Temporary plugging agents are critical to oilfield operations such as diversion fracturing,wellbore interventions,and drilling.This study develops a double-crosslinked self-degradable gel(DSDG)using polydopamine and p... Temporary plugging agents are critical to oilfield operations such as diversion fracturing,wellbore interventions,and drilling.This study develops a double-crosslinked self-degradable gel(DSDG)using polydopamine and poly(ethylene glycol)diacrylate as crosslinkers for polyacrylamide,targeting low temperature reservoirs.The DSDG system integrates covalent crosslinking via C=C bonds and dynamic crosslinking through amine–catechol interactions.Gelation kinetics,rheological properties,self-degradation mechanisms,and gel breaking performance of DSDG were systematically characterized.By analyzing the influence of components on gelation kinetics and mechanical properties,the composition of DSDG was optimized to include 4–8 wt%acrylamide monomer,0.5–0.8 wt%initiator,and 0.2–0.6 wt%poly(ethylene glycol)diacrylate crosslinker,with a dopamine to acrylamide mass ratio of(5–8)×10−3.At 60–80℃,DSDG transitions from liquid to quasi-solid gel within 30–180 min,with>80%of the gelation process occurring in a low viscosity phase conducive to pumpable injection.Unoxidized catechol groups,π–πstacking,and hydrogen bonding synergistically enhance tensile strength,fracture toughness,and interfacial adhesion,enabling robust sealing under downhole stresses.Core flooding tests in 5–50 mD cores achieved initiation and breakthrough pressure gradients of 34.6–119 and 86.6–184.6 MPa/m,respectively.In simulated wellbore with an inner diameter of 120 mm,the pressure-bearing capacity reached 1.25 MPa/m.Acidic/alkaline conditions rapidly degrade polydopamine,disrupting network integrity and enabling controllable gel breaking times of 1–20 d.Free dopamine monomers inhibit acrylamide polymerization,reducing post-degradation viscosity to<10 mPa·s via shortened polyacrylamide chains. 展开更多
关键词 Self-degradable Double-crosslinked hydrogel Polydopamine Low temperature reservoir Temporary plugging agent
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Sedimentary heterogeneity-constrained differential diagenesis in fluvial tight sandstones:Implications for reservoir quality heterogeneity in sandbody architectural elements 认领 引用
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作者 Pan-Ke Sun Shi-Yi Jiang +7 位作者 Rui-Feng Yan Li Liu Gang Tian Zeng Sheng Bin Li Rui-Feng Zhou Si-Cheng Zhu Lin Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1105-1137,共33页
Fluvial tight sandstones,as unconventional reservoirs,feature complex sedimentary,diagenetic,and reservoir quality heterogeneities that fundamentally control their exploration and development.This study focuses on typ... Fluvial tight sandstones,as unconventional reservoirs,feature complex sedimentary,diagenetic,and reservoir quality heterogeneities that fundamentally control their exploration and development.This study focuses on typical fluvial tight sandstones of the Shanxi Formation in northern Sulige Gas Field(Ordos Basin),using core samples,field sections,logging data,and analytical tests to investigate the coupling relationships among sedimentary,diagenetic,and reservoir quality heterogeneities.Results demonstrate that:the target layer in the study area develops six lithofacies,three braided river sandbody architectural elements,two meandering river sandbody architectural elements,and five diagenetic facies.Different architectural elements and their internal lithofacies exhibit differences and coupling relationships in the strengths of sedimentary heterogeneity and diagenetic heterogeneity.Specifically:strong compaction diagenetic facies primarily occurs in siltstone lithofacies of sand-dominated,weakly sedimentary heterogeneous architectural elements;strong dissolution+microfracture development diagenetic facies is mainly distributed in coarser-grained sandstones of sand-dominated architectural elements with low sedimentary heterogeneity;clay mineral intercrystalline pore-dominated diagenetic facies is primarily located near interbeds within all architectural elements;strong carbonate cementation diagenetic facies predominates in thick mudstones at the top/bottom of architectural elements,and at contacts with pure mudstone interbeds;strong clay mineral cementation diagenetic facies concentrates in medium-heterogeneity architectural elements near pure mudstone interbeds and at contacts with silty mudstone interbeds.Sedimentary and diagenetic heterogeneities jointly control reservoir quality distribution in all architectural elements(excluding basal conglomerates):porosity and permeability decrease in positive rhythm as lithofacies grain size fines,while irreducible water saturation increases in inverse rhythm.The findings of this study can provide a robust basis for the exploration and development deployment of fluvial tight sandstone reservoirs. 展开更多
关键词 Fluvial tight sandstone Reservoir quality Sedimentary heterogeneity Diagenetic heterogeneity Ordos Basin
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Hydrochemical characteristics,evolution,and controlling factors of a karstic river with reservoirs:Insights from spatial-temporal analysis 认领 引用
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作者 Jiang Wu Ting Wang +4 位作者 Tang Liu Jia-Ju Liu Nan Xu Hui Zeng Ling-Yan He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期108-119,共12页
Understanding water chemistry in karst regions is crucial for improving global water resource management and deepening our knowledge of the biogeochemical cycles shaping these sensitive environments.Despite advance-me... Understanding water chemistry in karst regions is crucial for improving global water resource management and deepening our knowledge of the biogeochemical cycles shaping these sensitive environments.Despite advance-ments in karst hydrology,significant gaps remain in long-term trends,underlying processes,and quantitative effects of environmental changes.This is especially true in areas like the Wujiang River(WJ)in China,where human activities such as reservoir construction and land use/cover changes have accelerated hydrochemical changes.We combined recent and historical monitoring data to provide a detailed analysis of the spatial and temporal characteristics,evolution,and controlling factors of major ions in WJ.These findings are important for local water management and contribute to global efforts to manage similar karst systems facing human-induced pressures.Our research shows clear seasonal differences in solute concentrations,with higher levels during the dry season.WJ’s water is rich in calcium,with Ca-HCO3 ion pairs being the most common.Reservoir monitor-ing stations show much higher levels of NO3−and SO42−compared to river-type stations,likely due to longer hydraulic retention time and increased acid deposition.The study confirms the significant role of pH and water temperature in rock weathering processes.Land use/cover changes were identified as the primary drivers of solute variations(46.37%),followed by lithology(13.92%)and temperature(8.35%).Over the past two decades,in-tense carbonate weathering has been observed,especially during wet seasons.Among karstic provinces,Guizhou Province stands out with the highest ion concentrations,indicative of its extensive karst coverage and heightened weathering processes. 展开更多
关键词 Wujiang river Karst Reservoir Major ion Controlling factor
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Feasibility of underground gas storage construction from large-scale low-permeability lithologic gas reservoirs:Insights into microscopic storage spaces 认领 引用
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作者 Zhen-Hua Tian Yong Xia +7 位作者 Jian-Guo Zhang De-Long Wang Zhi-Jun Liu Chen-Yang Zhao Yu-Xuan Xia Jun-Wei Su Deng-Ke Liu Jian-Chao Cai 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1606-1623,共18页
The construction of underground gas storage(UGS)in a large-scale low-permeability lithologic gas reservoir presents an immense engineering challenge.Under the context of UGS,research on structural characteristics and ... The construction of underground gas storage(UGS)in a large-scale low-permeability lithologic gas reservoir presents an immense engineering challenge.Under the context of UGS,research on structural characteristics and storage capacity at the microscopic scale is insufficient,making it difficult to provide effective support for the engineering scheme.In this study,the microscopic storage spaces of a typical lithologic gas reservoir(i.e.,YL block in the Ordos Basin)are comprehensively analyzed through experimental techniques(represented by computed tomography scanning),digital core analysis,and fractal analysis.Furthermore,the feasibility of UGS construction is examined.The results demonstrate that the large-scale low-permeability lithologic gas reservoir exhibits significant zonal heterogeneity in its microscopic structural characteristics at both morphological and statistical levels.Specifically,the microscopic storage spaces of the core zone within the YL block are notably higher than those in the transition and periphery zones,characterized by larger aperture,less tortuous,higher aggregation and connectivity.Consequently,the core zone provides adequate storage capacity and injection-extraction capability for large-scale underground storage of natural gas.In contrast,the transition and periphery zones exhibit inferior microstructural,storage,and flow properties,which are not suitable for rapid injection and production.However,these zones show a fairly strong lateral sealing capability,which can be utilized as a monitoring area to evaluate UGS integrity.These findings indicate that the reservoir's microstructural features meet the essential requirements of storage capacity,injection-extraction capability,and lateral sealing property for UGS construction.Based on this understanding,a series of zone-differentiated UGS engineering suggestions are proposed,including zonal function specification,well type selection,well deployment scheme,and management of old wells.These findings can provide valuable insights for the assessment and implementation of UGS projects from such gas reservoirs. 展开更多
关键词 Underground gas storage Lithologic gas reservoir Microstructure Micro-CT Zonal discrepancy
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