四川盆地西部流体封存箱与天然气成藏的关系  

The relationship of fluid compartment and gas reservoir forming in the west of Sichuan Basin

作　　者：罗啸泉[1] 

机构地区：[1]中国石化西南分公司,四川成都610081

出　　处：《特种油气藏》2005年第6期18-21,共4页Special Oil & Gas Reservoirs

基　　金：国家"十五"重点科技攻关项目"四川盆地西部低渗透气藏勘探开发关键技术研究"资助(项目编号:2001BA605A-05)

摘　　要：川西坳陷经历了晚三叠世以来前陆盆地的复杂构造演化,是整体超压的陆相碎屑岩含气领域。运用流体封存箱理论,对川西流体封存箱与天然气成藏关系进行了分析。川西流体压力封存箱的演化可划分成印支晚期—燕山期须家河组封存箱的形成和喜山期须家河组封存箱的改造2个阶段。川西致密碎屑岩生烃增压和成岩致密化是T3超压封存箱形成的主要原因,后期的构造运动对须家河组封存箱的改造,使天然气向箱外“混相涌流”,在浅中深层形成了规模的次生气藏。Chuanxi depression had experienced complicated foreland basin structure evolution since late Triassic,and is a continental clastic rock gas-bearing system under overpressure.This paper analyzes the relationship between Chuanxi fluid compartment and gas reservoir forming.The evolution of Chuanxi fluid pressure compartment can be divided into two stages: the forming of Xujiahe formation compartment in late Indo-Chinese stage—Yanshan stage,and the reconstruction of the compartment in Himalayan stage.Hydrocarbon generation boosting and diagenetic compaction of Chuanxi tight clastic rock is the main reason of forming T3 overpressure compartment.The reconstruction of Xujiahe formation compartment due to late tectonic movement resulted in the 'miscible rushing' of natural gas out of the compartment.There formed secondary gas reservoir of certain scale in shallow-medium deep formation.

关 键 词：致密碎屑岩 流体封存箱 天然气成藏 四川盆地西部 

分 类 号：TE122[石油与天然气工程—油气勘探]