【摘要】 对柴达木盆地东部地区侏罗系大煤沟剖面、绿草山剖面进行了露头取样,并利用Rock-Eval生油岩评价仪、色谱—质谱仪、稳定同位素质谱仪等实验分析测试技术对样品进行了地球化学特征分析。实验结果表明,样品有机碳含量变化从0.07%到56.8%,有机质类型以Ш型有机质为主,少数为型有机质,极少数为型有机质,灰黑色油页岩及黑色炭质页岩是侏罗系中的优质烃源岩。检测样品C29甾烷异构化参数C29αββ/(αββ+ααα)、C29ααα20S/(20S+20R)分布范围分别为0.25~0.35、0.06~0.34,处于未熟—低熟状态。侏罗系水体环境较浅,多为滨浅湖与沼泽环境,具有煤系烃源岩特点,局部为水体比较咸化的半深湖—深湖环境。更多还原

【Abstract】 In order to the investigation on the Sedimentary Environments and Generation Potentials of the Possible Source Rocks in the Jurassic System in the Eastern Qaidam Basin,the rock samples selected from the outcrop in the Jurassic System were analyzed including the organic carbon content,the parameters of pyrolysis,biomarker characters of saturated hydrocarbon and stable carbon isotope quality of individual n-alkanes by means of Rock-Eval,GC-MS,GC-MS-MAT and so on.The results showed that: the content of organic carbon ranged from 0.07% to 56.8%,most of the source rocks were type Ш of kerogen,a few of the source rocks were type Ⅱ of kerogen and few were type Ⅰ of kerogen.Gray-black oil shale and black charcoal shale were high quality source rocks in Jurassic system comparatively.The value of the parameters of C₂₉ααα20S/（20R+20S）and C₂₉αββ/（αββ+ααα）was 0.06～0.34 and 0.25～0.35,and the organic matter was being in the stage of low maturity.The organic matter was mostly deposited in an environment of lake beach,shallow lake and marsh with oxidation,showing the characters of coal-measure rocks.A few of rock samples revealed a reducing environmentof semi-deep lake or deep lake with high salty and water column stratification.更多还原