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烃源岩残余有机碳含量下限值是划分有效烃源岩的重要指标之一。目前关于碳酸盐岩有效烃源岩有机碳含量下限值主要由经验分析来确定,取值高低存在比较大的分歧。鄂尔多斯盆地马家沟组碳酸盐岩热演化程度高、有机质类型好。笔者针对马家沟组烃源岩生成油气具有近距离运聚的成藏特征,从烃源岩吸附气定量分析出发,结合典型井不同有机碳含量的烃源岩排烃史模拟计算,综合分析认为以0.25%作为高成熟—过成熟碳酸盐岩有效排烃的烃源岩残余有机碳含量下限值。
Lower limit of residual organic carbon content of source rocks is one of the important indexes to divide effective source rocks. At present, the lower limit of organic carbon content of effective source rocks of carbonate rocks is mainly determined by empirical analysis. There is a big difference between the values of organic carbon contents. The Ordovician basin Majiagou carbonate thermal evolution of a high degree of organic matter type is good. Based on the quantitative analysis of adsorbed gas from source rocks and the combined calculation of hydrocarbon expulsion history of source rocks with different organic carbon content in a typical well, 0.25% is considered as the lower limit of residual organic carbon content of hydrocarbon source rocks that effectively expulsion from high mature-over-mature carbonate rocks.