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鄂尔多斯盆地南部镇泾地区中生界原油地球化学特征及油源分析

Keywords: 鄂尔多斯盆地南部,镇泾地区,地球化学特征,油源对比,生物标志化合物

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Abstract:

?系统采集了鄂尔多斯盆地南部镇泾地区中生界的烃源岩、原油及油砂样品,对它们抽提物中的饱和烃馏分进行gc-ms分析,研究饱和烃生物标志化合物组成特征,探讨研究区中生界原油的来源。研究表明:根据姥植比、c30重排藿烷和8β(h)-补身烷相对含量,镇泾地区中生界烃源岩可划分为a1、a2、a3、b4类,原油可划分为ⅰ、ⅱ2类。ⅰ类原油来自深湖相沉积相带的长7油页岩(a1类),ⅱ类原油来自深湖—半深湖沉积相带的长7暗色泥岩(a2类)。长7油页岩是鄂尔多斯盆地南部中生界的主力烃源岩,各油层组的原油主要来自该烃源岩。

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