库车前陆冲断带博孜—大北万亿方大气区的形成机制  

Formation mechanism of the Bozi—Dabei trillion cubic natural gas field,Kuqa foreland thrust belt

作　　者：杨学文[1] 王清华[1] 李勇[1] 吕修祥[2,3] 谢会文[1] 吴超[1] 王翠丽 王祥[1] 莫涛[1] 汪瑞 YANG Xuewen;WANG Qinghua;LI Yong;L Xiuxiang;XIE Huiwen;WU Chao;WANG Cuili;WANG Xiang;MO Tao;WANG Rui(PetroChina Tarim Oilfield Company,Korla 841000,China;School of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油塔里木油田公司,新疆库尔勒841000 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《地学前缘》2022年第6期175-187,共13页Earth Science Frontiers

基　　金：中国石油天然气股份有限公司重大科技专项(2018E-1806)。

摘　　要：库车前陆盆地克拉苏构造带博孜—大北地区超深层是塔里木油田目前油气勘探的重点领域,评价天然气资源量超万亿方。基于岩心、薄片、分析化验、测井及生产资料,对博孜—大北地区的油气源、储层、盖层特征进行分析,系统研究了该地区油气输导与充注特征,深入分析了博孜—大北地区油气成藏条件和油气聚集过程,明确了博孜—大北万亿方大气区的形成原因。研究结果表明:油气成藏具有“早期聚油,晚期聚气,超压充注,垂向输导、高效聚集”的总体特征。“早期浅埋、晚期快速深埋”使烃源岩具备持续生烃能力;良好的储、盖配置关系和断裂体系的垂向输导为油气的运聚提供了先决条件。成熟—过成熟的烃源岩,平面成排成带、垂向叠置分布的圈闭群,优质储层相带以及巨厚膏盐岩盖层在博孜—大北地区有效叠合,形成高丰度、超高压的大气藏群。The ultra-deep layer of the Bozi—Dabei area,Kelasu structural belt,Kuqa foreland basin is a crucial oil and gas exploration area in the Tarim Oilfield with the estimated natural gas resource exceeding one trillion cubic meters.Based on cores,cast sheets,analytical assays,well logging and production data,the oil and gas sources,reservoirs and caprocks in the Bozi—Dabei area are analyzed,and subsequently the oil/gas transport and charging characteristics are systematically studied,the hydrocarbon accumulation conditions and process are analyzed,and the formation mechanism of the giant Bozi—Dabei natural gas field is clarified.The general characteristics of oil/gas accumulation are early oil accumulation,late gas accumulation,overpressure charging,vertical transport,and efficient accumulation.And the“early-stage shallow burial,late-stage rapid deep burial”regiment enables the source rocks to generate hydrocarbon continuously,while the good reservoir-cap configuration and vertical transport via faults provide the pre-conditions for oil/gas migration and accumulation.Mature to over-mature source rocks,planar-arranged and vertical-stacked traps,high-quality reservoir facies belts,and huge thick gypsum-salt caprocks are effectively superimposed in the Bozi—Dabei area to form the large high-abundance,ultra-high-pressure natural gas reservoirs.

关 键 词：库车前陆盆地 前陆冲断带 克拉苏构造带 高压 油气聚集模式 

分 类 号：TE122[石油与天然气工程—油气勘探]