【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。更多还原

【Abstract】 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 generation,one is the late Jurassic to late Cretaceous,the other is late Tertiary.The middle Jurassic Buqu-Xiali assemblage 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.更多还原