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Key geological factors governing sweet spots in the Wufeng-Longmaxi shales of the Sichuan Basin,china

Energy Geoscience 2024年第3期5卷 163-174页

作者： Zongquan Hu Zengqin Liu Wei Du Zhenrui Bai Ruyue Wang Chuanxiang Sun Dongjun Feng State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development SINOPECBeijing102206China Key Laboratory of Shale Oil/Gas exploration and Production Technology SINOPECBeijing102206China Petroleum exploration and Production Research Institute SINOPECBeijing102206China

Production performance of the Wufeng-Longmaxi shales varies significantly among Fuling,Weirong,and Wulong fields in the Sichuan *** organic carbon(TOC)content,mineralogy,and organic matter(OM)pore characteristics are investigated to identify key factors governing sweet *** shales with good preservation conditions in the Fuling Field exhibit large thickness,high TOC content and thin-section porosity(TSP),and well-developed OM macropores,thus high initial production and estimated ultimate recovery(EUR).Thin carbonate-containing siliceous shales with good preservation conditions in the Weirong Field feature medium-to-high TOC and well-developed OM macropores but low TSP,leading to high initial production but low *** shales with poor preservation conditions in the Wulong Field are characterized by large thickness,high TOC,low TSP and poorly-developed OM macropores,causing low initial production and *** sedimentary and preservation conditions are intrinsic decisive factors of sweet spots,as they control the mineral composition,TOC,and OM macropore ***-water shales in transgressive systems tracts(TSTs)exhibit better-developed OM macropores and greater TOC compared to highstand systems tracts(HSTs).OM macropores are most prevalent in siliceous shales,followed by carbonate-containing siliceous shales and then argillaceous ***,good preservation conditions are conducive to retain OM macropores with low pore aspect ratio(PAR).Comparison among the three fields shows that high-TOC silicious shales with good preservation conditions are the highest in TSP and ***,organic richness,lithofacies,and preservation conditions are the major factors which determine OM pore development,governing the sweet spots of the Wufeng-Longmaxi shales.

关键词： Shale gas Organic matter pores Sweet spot Wufeng-Longmaxi shales Sichuan basin

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Characteristics of microscopic pore heterogeneity and development model of Wufeng‒Longmaxi Shales in the Pengshui area of south-east Chongqing

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Frontiers of Earth Science 2024年第1期18卷 188-203页

作者： Lu SUN Zhigang WEN Guisong HE Peixian ZHANG Chenjun WU Liwen ZHANG Yingyang XI Bo LI College of Resources and Environment Yangtze UniversityWuhan 430100China Research Institute of exploration and Development Sinopec East China CompanyNanjing 210011China

Normal-pressure shale gas reservoirs are widely distributed in south-eastern Chongqing and show good potential for resource *** paper reports the organic matter(OM),physical,and pore characteristics,mineral composition,and gas content of representative shale samples from the Upper Ordovician Wufeng Formation and Member 1 of the Lower Silurian Longmaxi Formation(Long 1 Member).Microscopic pores within different shale layers of the Long 1 Member were classified,quantitatively evaluated,and their development mechanisms were systematically *** found that OM characteristics,mineral composition,and pore type were the main factors affecting the enrichment and preservation of shale *** characteristics of the Long 1 Member are mainly controlled by changes in the sedimentary *** are evident differences in total organic carbon content and mineral composition vertically,leading to a variable distribution of pores across different *** matter abundance controls the degree of OM pore development,while clay minerals abundance control the development of clay mineral-related *** organic carbon content generally controls the porosity of the Long 1 Member,but clay minerals also play a role in OM-poor *** connectivity and permeability are influenced by the development of pores associated with brittle *** propose a microscopic pore development model for the different *** geochemical data and this pore development model,layers 1‒4 are considered to be excellent shale gas preservation and enrichment *** preservation conditions in layers 5‒7 result in high levels of shale gas *** 8‒9 possess a better sealing condition compared with layers 5‒7 and are conducive to the enrichment and preservation of shale gas,and can thus be used as future potential target *** research provides a theoretical basis for exploring and evaluating shale gas potential in the studied region or other co

关键词： shale gas pore characteristics Longmaxi Formation reservoir model

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An overview of the geology and production of the Fuling shale gas field,Sichuan Basin,china

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能源地球科学(英文) 2020年第3期1卷 147-164页

作者： Haikuan Nie Donghui Li Guangxiang Liu Zhiyuan Lu Hu Wang Ruyue Wang Guangrong Zhang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing100083China sinopec Petroleum exploration and Production Research Institute Beijing100083China sinopec Key Laboratory of Shale Oil/Gas exploration&Production Beijing100083China china University of Geosciences(Beijing) Beijing100083China

The Fuling shale gas field in china is the largest shale gas field as well as the largest of its type discovered in any Lower Paleozoic *** this study,the geology and production of the upper and lower gas layers in the Fuling shale gas field are evaluated in terms of structure,shale quality,fault,initial production,and estimated ultimate recovery(EUR).The shale in the lower gas layer of the Jiaoshiba anticline is a high-quality reservoir,where the space is dominated by organic pores in kerogen,and the gas content is *** shale gas wells reveal relatively high initial production and ***,the shale in the upper gas layer of the Jiaoshiba anticline has reservoir space mainly composed of clay mineral pores and organic pores within bitumen,and the gas content is *** terms of structure,primary gas migration may occur in the upper gas layer,resulting in free gas accumulation in the structural high,where the development effects are generally better than those in the structural *** lower gas layer in the Pingqiao anticline,is the main interval for shale gas accumulation and development due to the high-quality *** the influence of faults,the efficiency of exploration wells emplaced on top of the anticline is much lower a compared with those in the *** residual synclines close to the Sichuan Basin,including the Baima and Baitao anticlines,are characterized by more recent uplifts,larger area,greater distance from the deep and large faults,and early fracture ***,we recommend that the shale gas exploration and development should be carried out preferentially in areas close to the center of the residual synclines,featuring relatively high-pressure coefficient and moderate burial depth.

关键词： Geologic characteristics Production features Longmaxi formation Fuling shale gas field Sichuan basin

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