羌塘盆地油气成藏主控因素分析  

Key Controlling Factors of Hydrocarbon Accumulation in the Qiangtang Basin

作　　者：南征兵[1] 张艳玲[2] 李永铁[1] 郭祖军[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国地质环境监测院,北京100081

出　　处：《天然气地球科学》2012年第3期469-473,共5页Natural Gas Geoscience

摘　　要：羌塘盆地为青藏高原上面积最大的一个中生代海相残留盆地,以三叠系和侏罗系为主要目的层,迄今为止已发现200多处油气显示和一个古油藏。埋藏史及热演化史分析认为,盆地至少发生过2次油气生成过程,第一次在侏罗纪晚期—白垩纪晚期,第二次在新近纪。盆地发育4套储盖组合,中侏罗统布曲组—夏里组为最有利的组合。通过对盆地油气显示的分析及古油藏解剖,初步认为盆地的油气储盖组合可能主要为自生自储型,后期的保存是最关键的控制因素。Qiangtang basin is the biggest Mesozoic marine residual basin;its main targets cover the Triassic and Jurassic. Up to present,more than 200 oil and gas shows and a destroyed oil reservoir are discovered. According to burial and thermal evolution history, the basin has at least two times of hydrocarbon genera- tion ,one is the late Jurassic to late Cretaceous,the other is late Tertiary. The middle Jurassic Buqu-Xiali as- semblage is the most favorable one in the four reservoir-cap assemblages. Based on analysis of oil and gas shows and destroyed oil reservoir, we point out that the reservoir-cap assemblage should be self-generation and self-reservoir, and the late conservation is fate for oil and gas accumulation.

关 键 词：构造背景 成藏条件 生储盖组合 油气显示 羌塘盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]