系统采集鄂尔多斯盆地南部中生界的烃源岩、富县地区延长组原油及油砂样品,对它们的饱和烃馏分进行GC-MS 分析,通过对生物标志物组成特征的研究探讨富县地区延长组原油的来源。结果表明:根据Pr/Ph,8β(H)-补身烷和C30重排藿烷相对含量,鄂尔多斯盆地南部中生界烃源岩可划分为A1、A2、A3、A4、B 类,富县地区延长组原油可划分为Ⅰ、Ⅱ、Ⅲ类,目前发现的原油主要是第Ⅰ类;第Ⅰ类原油来自A1类烃源岩(深湖相沉积相带的长7 油页岩),第Ⅱ类原油来自A2类烃源岩(深湖-半深湖沉积相带的长7 暗色泥岩),第Ⅲ类原油来自A3类烃源岩(半深湖沉积相带的长7 暗色泥岩)。
Samples of the Mesozoic source rock, crude oil and oil-bearing sands from Fuxian area in the southern Ordos Basin were collected systematically. Gas chromatography-mass spectrometry (GC-MS) was performed on the saturated hydrocarbon fractions extracted from these samples for discussing their biomarker characteristics and crude oil origin. The results show that on the basis of biomarker source parameter distribution, the Mesozoic source rock can be divided into five types (type A1、A2、A3、A4 and B), and the crude oil can be grouped into three types (I, II and III). Type I crude oil is derived from type A1 source rock (Chang 7 oil shale deposited in a reducing, deep lacustrine facies environment). Type II crude oil is sourced from type A2 source rock (Chang 7 dark mudstone deposited in subreducing to reducing, deep or semi-deep lacustrine facies environments). Type III crude oil is sourced from type A3 source rock (Chang 7 dark mudstone deposited in a sub-reducing to reducing, semi-deep lacustrine facies environment).
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