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通过开展对未成熟干酪根的热模拟实验,测定干酪根在不同演化阶段产出液体烃的碳同位素组成。阐明由于演化影响导致原油中碳同位素分馏的原因,并结合模拟实验结果验证和解释了地层中母岩干酪根和所产原油在高成熟阶段碳同位素组成发生“逆转”的现象,同时,提出利用碳同位素对多产层地区油/油源对比中,必须注意演化程度要在相同的演化阶段才有可比性,特别在高成熟地区,否则有可能导致错误判断。
Through the thermal simulation experiment on immature kerogen, the carbon isotope composition of liquid hydrocarbons produced by kerogen at different stages of evolution was determined. The reasons for the carbon isotope fractionation in crude oil due to the evolutionary effects are elucidated. Combined with the simulation results, the “reversal” of the carbon isotope composition of the kerogen and the produced crude oil in the strata during the mature stage is verified and explained. At the same time, In carbon isotope comparison of oil / oil sources in the productive areas, care must be taken that the degree of evolution is comparable at the same evolutionary stage, especially in highly mature areas, which may lead to misjudgment.