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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。
The Qiangtang Basin is a Mesozoic marine residual basin with the largest area on the Tibetan Plateau. Triassic and Jurassic are the main strata. So far, over 200 hydrocarbon pools and one paleo-oil reservoir have been discovered. According to burial history and thermal evolution history, there are at least two hydrocarbon generation processes in the basin, the first in the late Jurassic - Late Cretaceous and the second in Neogene. Four reservoir-cap assemblages were developed in the basin, and the Middle Jurassic Buqu Formation-Xiali Formation was the most favorable combination. Based on the analysis of oil and gas in the basin and the paleo-oil reservoir anatomy, it is preliminarily thought that the hydrocarbon accumulation and accumulation in the basin may be mainly self-storage and storage, and the preservation is the most crucial control factor.