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鄂尔多斯盆地苏里格地区上古生界地层为海陆交互及河流~湖泊三角洲相的石炭~二叠系含煤岩系。下二叠统山西组发育煤和暗色泥岩二类烃源岩。根据苏里格及周边地区大量钻井岩芯样品的残余有机碳含量,干酪根同位素,有机质显微组份组成,干酪根镜质体反射率(Ro)等地球化学数据,综合分析了下二叠统山西组烃源岩的有机质丰度,类型和热演化程度。采用有机碳产烃率法,分别计算了煤层和暗色泥岩的生烃强度。在此基础上,结合苏里格地区山西组成藏特征,综合评价认为山西组生烃能力居于中等偏低的级别。
The Upper Paleozoic strata in the Sulige area of the Ordos Basin are composed of Carboniferous-Permian coal measures of sea-land interaction and river-lake delta facies. The lower Permian Shanxi Formation developed two types of source rock, coal and dark mudstone. Based on the data of residual organic carbon, kerogen isotopic composition, microstructure of organic matter and vitrinite reflectance (Ro) of a large number of core samples in Sulige and surrounding areas, Organic Matter abundance, Types and Thermal Evolution of Source Rocks in Tongshan Formation. Hydrocarbon generation intensity of coal seam and dark mudstone were calculated by organic carbon production rate method respectively. On this basis, combined with the characteristics of the formation of the Shanxi Formation in the Sulige area, the comprehensive evaluation suggests that the hydrocarbon generation capacity of the Shanxi Formation is at a lower level.