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过成熟阶段碳酸盐生油岩中烃类产物的相态已由油相演化到湿气、干气相。过成熟阶段碳酸盐岩作为气源岩时,其有机碳含量下限值不仅决定于本身的吸附烃量、有机质类型和热演化程度,而且排烃机理和排烃条件对它也有一定的影响。该文以鄂尔多斯盆地奥陶系马家沟组过成熟碳酸盐岩为例,首先通过罐装岩屑酸解烃法、残余气饱和度法和全烃地化分析法对吸附气态烃进行定量分析,估算出有机碳含量下限值为0.03%～0.06%,然后结合不同排烃机理对有机碳含量下限值作进一步的探讨。
The phase state of hydrocarbon products in the carbonate rocks in the overripe stage has evolved from oil phase to moisture and dry gas. Carbonate rocks as source rocks in the over-maturity stage have a lower limit of organic carbon content not only on the amount of adsorbed hydrocarbons, on the type of organic matter and on the degree of thermal evolution, but also on the hydrocarbon expulsion mechanism and hydrocarbon expulsion conditions . Taking the mature carbonate rocks of Ordovician Majiagou Formation in Ordos Basin as an example, this paper first quantifies the adsorption of gaseous hydrocarbons by means of canned rock chip acidolysis, residual gas saturation and total hydrocarbon geochemical analysis Analysis, it is estimated that the lower limit of organic carbon content is 0.03% ~ 0.06%, then the lower limit of organic carbon content is further discussed in combination with different hydrocarbon expulsion mechanism.