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银额盆地东部查干凹陷首次发现轻质低硫成熟原油 ,其饱和烃含量在 90 %以上 ,成熟度相当于镜煤反射率Ro1.0 %左右 ,是生油高峰阶段的产物 ;原油全碳同位素δ13C值 - 31.1‰。原油生物标志物中类异戊二烯含量较高 ,植烷与姥鲛烷均势 ;三环萜烷含量高于五环萜烷 ;含有较高的TsC2 9、TsC30 重排藿烷、伽马蜡烷 ;藿烷中以C30 藿烷为主 ,C32 以上升藿烷含量极低 ;孕甾烷含量高 ;甾烷中以C2 9甾烷为主 ,C2 7甾烷含量也较高 ,异胆甾烷含量高于胆甾烷 ;重排甾烷含量低 ;甾烷的含量与萜烷含量相当 ,是典型的湖相原油。已发现的天然气中甲烷含量达 80 % ,为湿气。原油和源岩生物标志物组成特征分析对比表明下白垩统巴音戈壁组源岩是主要油源岩。生物标志物特征示原油具有一定的运移效应
For the first time, light and low sulfur mature crude oil is found in the Chagan Depression of the eastern part of the Yinzuo Basin. Its saturated hydrocarbon content is over 90% and its maturity is about 1% of Ro, which is the reflection coefficient of specular coal. It is the product of the crude oil peak period. Isotope δ13C value - 31.1 ‰. Crude oil biomarkers higher isoprenoid content, phytane and pristane homogeneous potential; tricyclic terpane content higher than pentacyclic terpane; contains higher TsC2 9, TsC30 rearranged hopane, gamma wax Alkane; hopane mainly C30 hopane, C32 to increase the hopane content is very low; gestagene content is high; sterane C2 9 sterane mainly C2 7 sterane content is also higher, The content of alkane is higher than that of cholestane; the content of rearrangement sterane is low; the content of sterane is equivalent to that of terpane, which is a typical lacustrine crude oil. Natural gas has been found in the methane content of 80%, as moisture. The analysis of the characteristics of biomarker composition of crude oil and source rocks shows that the Lower Cretaceous Bayinogobi source rocks are the main source rocks. Biomarker characteristics show crude oil has a certain migration effect