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根据鄂尔多斯盆地东南部上古生界天然气组分分析、水分析、试气等测试分析资料,针对其气藏地球化学特征和烃源岩开展系统分析。通过相关地球化学参数分析及生烃强度计算,分析评价鄂尔多斯盆地东南部上古生界烃源岩,并结合试气成果分析烃源岩对天然气富集的控制作用。研究成果表明鄂尔多斯盆地东南部烃源岩为一套海陆过渡相和河流-三角洲相的煤系沉积,生烃强度高且有显示广覆式生烃的特征,对天然气的富集具有明显的控制作用。
According to the analysis data of gas composition, gas analysis and gas test of the Upper Paleozoic in the southeast Ordos Basin, a systematic analysis of geochemical characteristics and hydrocarbon source rocks is carried out. Based on the analysis of relevant geochemical parameters and calculation of hydrocarbon generation intensity, the Upper Paleozoic source rocks in the southeast Ordos Basin are analyzed and evaluated, and the control effect of source rock on natural gas enrichment is analyzed based on the test results. The research results show that the source rocks in southeastern Ordos Basin are characterized by a set of marine facies transitional facies and stream-delta facies sedimentary facies with high hydrocarbon generation intensity and broad-cover hydrocarbon generation and obvious control over natural gas enrichment effect.