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

作     者：Zongquan Hu Zengqin Liu Wei Du Zhenrui Bai Ruyue Wang Chuanxiang Sun Dongjun Feng 

作者机构：State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentSINOPECBeijing102206China Key Laboratory of Shale Oil/Gas Exploration and Production TechnologySINOPECBeijing102206China Petroleum Exploration and Production Research InstituteSINOPECBeijing102206China 

出 版 物：《Energy Geoscience》 (能源地球科学（英文）)

年 卷 期：2024年第5卷第3期

页      面：163-174页

核心收录：

学科分类：0202[经济学-应用经济学] 02[经济学] 020205[经济学-产业经济学] 

基　　金：Sinopec East China Branch , and Sinopec Exploration Company Sinopec East China Branch, and Sinopec Exploration Company Sinopec Jianghan Oilfield Company Sinopec Southwest Oil & Gas Company 

主　　题：Shale gas Organic matter pores Sweet spot Wufeng-Longmaxi shales Sichuan basin 

摘      要：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.