塔里木盆地西南坳陷柯东1号构造白垩系原油特征

摘要

No.1 KeDong structure is an anticline like broken nose develops at the Kunlun piedmont in the southwest de-pression of the Tarim basin.Kd1 well drilling in the Cretaceous got a high yield. The geochemical characteristics of Crude oil show that the oil is medium maturity oil including high wax.The sterane pattern of C27,C28 and C29 is re-versed“L”,the content of C29 is high value.The C30 unknown terpene,C24 ethynylation and the Ts/Tm has high value. The characteristics of biological markers show that the crude oil should come from Permian hydrocarbon source rocks. Maturity analysis suggest that low molecular weight hydrocarbons are producted in high-over ripe stage,and the high mo-lecular weight hydrocarbons maturity parameters indicated that when the oil formed,hydrocarbon source rocks are at high-over ripe stage.Therefore,we think that kd1 crude oil is mixed from Permian hydrocarbon source rocks mature peri-od, high ripe stage.%　　柯东1号构造是塔里木盆地西南坳陷昆仑山前发育的断鼻型圈闭，钻探kd1井白垩系获高产工业油气流。原油地球化学特征表明，其为高含蜡中质成熟原油，甾烷中C27、C28、C29甾烷呈反“L”型分布，以C29甾烷含量高为特征，萜烷类C29、C30重排霍烷、C30未知萜烷、C24四环萜烷、Ts含量相对较高。生物标志物特征表明，该原油来源于二叠系烃源岩。据原油成熟度分析认为，该原油高分子量芳烃和低分子量的轻烃是烃源岩分别在成熟阶段与高-过熟阶段产物。因此，kd1井白垩系原油是二叠系烃源岩成熟期、高熟期两期充注的混合原油。