Abstract
江油厚坝处于龙门山构造带的山前带，据调查现厚坝地区侏罗系的油气显示好，油苗分布范围较广。通过GC-MS分析等方法对研究区油砂样品的分析，研究区的样品生物标志化合物特征表现为三环萜烷丰富，以C23为主峰，规则甾烷具有C29 > C27 > C28的反“L”型特征；伽马蜡烷指数为0.56，Ts/Tm C27 > C28.The gammacerane index is 0.56, Ts/Tm < 1, Maturity is about 1.99%. It shows that crude oil comes from marine high salinity reduction environment. This area mainly developed in the lower Cambrian Qiongzhusi formation and Xujiahe formation of two sets of hydrocarbon source rocks, the maturity of the sample is closer to that of the Cambrian, the difference between aromatic hydrocarbon and Xujiahe formation is too large, the distribution characteristics of terpenes and steroids are similar to those of Cambrian source rocks. Therefore, it is considered that the source of crude oil in Jurassic oil sands in Houba area is Cambrian black mudstone source rock.
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