内蒙古锡林浩特地区中二叠统哲斯组烃源岩特征

Characteristics of Middle Permian Source Rocks in Zhesi Formation of Xilinhaote Area of Inner Mongolia

内蒙古中东部锡林浩特地区上古生界勘探程度较低,尚处于早期评价阶段。通过对石灰窑剖面、艾格那仁敖包剖面和南石灰厂剖面的测量和采样,运用有机碳测试、岩石热解、镜质体反射率、干酪根分析、饱和烃气相色谱质谱等技术对样品进行测试与分析,总结了该地区哲斯组(P2z)烃源岩有机质丰度、有机质类型和有机质成熟度的特征。结果显示:锡林浩特地区P2z泥岩属于中等烃源岩,有机质丰度一般,中等偏低;有机质类型主要为Ⅱ2型,少量为Ⅱ1;有机质演化程度高,大部分处于高成熟-过成熟阶段。

Oil exploration extent was lower in Upper Paleozoic of Xilinhaote Area in Inner Mongolia,it was at the earlier stage of evaluation.Through the measurement and collection of samples of the Shihuiyao Profile,Aigenarenaobao Pro-file,Nanshihuichang Profile,and residual organic carbon content,vitrinite reflectivity,kerogen analysis,rock pyrolysis and gas chromatography of saturated hydrocarbon were used for sample testing and analysis.The organic abundance of source rocks,organic types and its maturity were summarized.The results show that shale in Zhesi Formation of Middle Permian in Xilinhaote Area belongs to medium hydrocarbon source rock,organic abundance is at mid to low level.Organic matter is mainly TypeⅡ2,a small amount of sample is TypeⅡ1.The organic matter has a high degree of thermal evolution and is at mature and over mature stage.