川西拗陷雷口坡组输导体及其组合特征  

Transport conductors and its combination characteristics of Leikoupo Formation in western Sichuan Depression,China

作　　者：蒋宇 鲍典[2] 张文济[3] 叶朝阳 李世临[3] 雍自权[1] 李贝贝 JIANG Yu;BAO Dian;ZHANG Wenji;YE Zhaoyang;LI Shilin;YONG Ziquan;LI Beibei(State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;SINOPEC Northwest Oilfield Company, Urumqi 830011, China;Chongqing Gas Division, PetroChina Southwest Oil & Gas Field Company, Chongqing 400707, China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石化西北油田分公司,乌鲁木齐830011 [3]中国石油西南油气田分公司重庆气矿,重庆400707

出　　处：《成都理工大学学报（自然科学版）》2021年第2期195-205,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国石化基础科研项目(3440000-20-ZC0607-0028)。

摘　　要：探讨川西拗陷中三叠统雷口坡组输导体特征及其对油气成藏的贡献。综合利用野外露头、钻井岩心、地震解释、有机地球化学等资料对雷口坡组输导体类型、特征及组合方式进行剖析,提出了4种典型输导体和4种典型输导体组合模式,并讨论了其对天然气成藏的意义。4种典型输导体是:断层及其破碎带输导体、优质(内幕)储层输导体、风化壳输导体、褶皱和断层伴生裂缝输导体。断层及其破碎带输导体、风化壳输导体为油气长距离运移提供通道,优质(内幕)储层输导体、褶皱和断层伴生裂缝输导体为油气局部运移提供通道。不同的输导体组成了4类输导系统:断层及其破碎带和优质(内幕)储层外源输导系统、断层伴生裂缝层楼式外源输导系统、褶皱和断层伴生裂缝-优质(内幕)储层内源输导系统、断层及破碎带雷口坡组风化壳长距离外源的源-汇输导系统。断层及破碎带-雷口坡组风化壳长距离外源的源-汇输导系统是川西拗陷雷口坡组油气成藏最重要的运聚成藏系统。The Middle Triassic Leikoupo Formation gas reservoirs have complex structural background,multiple source layers,mixed-source reservoir formation and complicated reservoir-controlling factors.Comprehensive data of outcrop,drilling core,seismic interpretation and organic geochemistry from the Leikoupo Formation in the western Sichuan Depression are used to analyze the types,characteristics and combination of transport conductors and discuss its contribution to hydrocarbon accumulation.The study leads to the proposition of four typical transport conductors,4 combination modes as well as their significance to gas accumulation.The four typical transport conductors are fault and its damage zone transport conductor,high quality(inside)reservoir transport conductor,weathering crust transport conductor,fold and fault associated fracture transport conductor.Of the 4 transport conductors,the deep-large faults and their damage zone transport conductors and weathering crust transport conductors provide important channels for oil and gas migration over long distances.Different transport conductors constitute 4 types of transport systems,including faults and fracture zones-exogenous transport systems for high quality(inside)reservoirs;fault-associated fracture layered external transport system;fold and fault associated fractures-internal transport system of high quality reservoirs and fault and its damage zone-long distance exogenous sources-converges transport system of the weathering crust of Leikoupo Formation.The last transport system is considered to be the most efficient transport and accumulation system for oil and gas accumulation in Leikoupo Formation,western Sichuan depression.

关 键 词：雷口坡组 输导体 输导系统 油气成藏 四川盆地 

分 类 号：TE122.12[石油与天然气工程—油气勘探]