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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、B 4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。
The system collects samples from the Mesozoic source rocks, crude oil and oil sands in the Zhenjing area, southern Ordos Basin. GC-MS analyzes of the saturated hydrocarbon fractions in their extracts are carried out to study the compositional characteristics of saturated hydrocarbon biomarkers. District Mesozoic crude oil source. The results show that the Mesozoic source rocks in Zhenjing area can be divided into A1, A2, A3 and B4 classes according to the relative ratio of basal planting ratio, C30 rearranged hopane and 8β (H) For Ⅰ, Ⅱ 2 categories. Class I crude oil comes from Chang 7 oil shale (A1) of deep lacustrine sedimentary facies, and Class II crude oil comes from Chang 7 dark mudstone (A2) of deep lacustrine-semi-deep lake sedimentary facies. The Chang 7 oil shale is the main source rock of the Mesozoic in the southern Ordos Basin. The crude oil from each reservoir group mainly comes from this source rock.