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系统采集鄂尔多斯盆地南部中生界的烃源岩、原油及油砂样品,对其饱和烃和芳烃馏分进行气相色谱-质谱分析,通过对生物标志物组成特征的研究,分析和探讨中生界原油的油源。结果表明:根据8β(H)-补身烷和C3017α(H)-重排藿烷含量,鄂尔多斯盆地南部中生界原油可划分为Ⅰ,Ⅱ,Ⅲ类。第Ⅰ类原油8β(H)-补身烷含量高,C3017α(H)-重排藿烷含量低,来自深湖相沉积相带的长7油页岩(A1类),第Ⅱ类原油8β(H)-补身烷含量较高,C3017α(H)-重排藿烷含量中等,来自深湖—半深湖沉积相带的长7暗色泥岩(A2类),第Ⅲ类原油8β(H)-补身烷含量低,C3017α(H)-重排藿烷含量高,来自半深湖沉积相带的长7暗色泥岩(A3类),由于采集样品数量限制,第Ⅲ类原油不排除来自长8或长9暗色泥岩(A3类)的可能,目前发现的原油主要是第Ⅰ类,即各油层组的原油主要是由长7油页岩提供的,它是鄂多斯盆地南部中生界的主力烃源岩。
The system collects samples from the Mesozoic source rocks, crude oil and oil sands in the southern Ordos Basin and analyzes their saturated and aromatic fractions by gas chromatography-mass spectrometry (GC-MS). By analyzing the composition of biomarkers, The source of oil. The results show that the Mesozoic crude oil in southern Ordos Basin can be divided into Ⅰ, Ⅱ and Ⅲ according to 8β (H) - complement and C3017α (H) - rearranged hopane. Class I crude oil has a high content of 8β (H) -compound, a low content of C3017α (H) -renewable hopane, Chang 7 oil shale (A1) from the deep lacustrine facies, (H) - higher content of complementarity alkaloids, moderate C3017α (H) - rearranged hopane content from the Chang 7 dark mudstone (A2) in the deep lacustrine-semi-deep lake sedimentary facies, 8β ) - a long dark sandstone (A3 class) with a low content of complementarity and a high content of C3017α (H) - rearranged hopane from sedimentary facies in the semi-deep lake, and the type III crude does not exclude Chang 8 or Chang 9 dark mudstone (Class A3). The crude oil currently discovered is mainly of Class I. The crude oil of each oil layer is mainly provided by Chang 7 oil shale. It is a member of Mesozoic in the southern Ordos Basin The main source rock community.