对羌塘盆地中生界共242个露头烃源岩样品以及6个油苗样品进行了正构烷烃碳教分布模式,多环芳烃系列相对含量组成,甾烷组成,甾、萜系列相对含量等多项测试对比研究.岩样分布于侏罗系索瓦组、夏里组、布曲组、色哇组、曲色组以及上三叠统肖查卡组这六套主要烃源岩层系.油样分布于雪山组、索瓦组、夏里组以及布曲组.布曲组烃源岩是多个不同地层古油藏的主要贡献者.是羌塘盆地的主力烃源岩层系之一;雪山组古油藏很可能另有主力油源层,它与所述的六套烃源岩均无可比性.

A number of oil seepages displaying paleoreservoirs have been found in the Mesozoic marine sedimentary formations of Qiangtang Basin. According to correlating the geochemical data achieved with 242 source rock samples from the Jurassic Sowa, Xiali, Buqu, Sewa and Quse Formations and Upper Triassic Xiaochaka Formation, as well as 6 oil seepages samples from the Jurassic Xueshan, Sowa, Xiali and Buqu Formations, including the plots of n-alkane distribution, the relative content of poly-aromatics, the steroid composition,and the relative content of steroid and terpenoid hydrocarbon, etc., it is suggested that the Middle Jurassic Buqu source rock is the contributor to most of the paleoreservoirs so that it is maybe at least one of the mail oil source formations of the paleoreservoirs in the Basin. The paleoreservoir in Upper Jurassic Xueshan Formation is weakly correlative with the 6 sets of source rock formations, which implies that the oil in it is likely to derive from another source rock.