川中地区侏罗系沙溪庙组远源型致密砂岩气充注能力定量评价OA

Tight sandstone gas reservoirs located far from source rocks in the Jurassic Shaximiao Formation represent an im-portant target for oil and gas exploration in the Sichuan Basin.The natural gas charging capacity controlled by the fault-sand configuration plays a critical role in governing the scale of gas accumulation and enrichment in the Shaximiao Formation.However,quantitative evaluation of the selective charging capacity of natural gas into different sandstone bodies remains lim-ited.Taking the central Sichuan Basin as an example,this study investigates the characteristics and origins of natural gas reservoirs,as well as the evolution of source-fault-sand configuration relationships,to quantitatively evaluate natural gas char-ging processes and determine the charging capacity of tight sandstone reservoirs in the Shaximiao Formation.The results indi-cate that the tight sandstone gas in the Shaximiao Formation of the central Sichuan Basin is mainly sourced from the Xujiahe Formation.Significant differences exist in the gas charging capacities of different fluvial sandstone bodies within the Shaximi-ao Formation.Among them,the No.8 sandstone member east of the Longquanshan Fault exhibits the highest charging ca-pacity,followed by the No.8 sandstone member south of the Jiao① Fault.These sandstone bodies play a decisive role in gas accumulation and enrichment within the Shaximiao Formation.Comprehensive analysis demonstrates that efficient source-fault-sand coupling is the key factor controlling tight sandstone gas accumulation far from source rocks.Specifically,the source-fault configuration controls the scale of gas supply,while the fault-sand configuration determines the effectiveness of gas charging.