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金管封闭体系热模拟条件下镜质体生烃动力学研究表明:活化能随镜质体类型、结构的不同而有很大差异.均质镜质体裂解活化能最高而基质镜质体活化能分布相对较低.而由不同类型镜质体裂解生成的甲烷均具有非常相似的碳同位素分布,热模拟早期δ~(13)C_1随温度的升高而下降,晚期逐渐上升,更高温度热解时保持平衡或略有下降.由此可见镜质体的热解天然气碳同位素分馏主要受时间、温度及总碳同位素值的控制,而镜质体结构及活化能分布对碳同位素分馏影响较小.早期δ~(13)C_1下降的趋势可能是由于镜质体的不均质性或在不同的活化能区间~(12)C-~(12)C及~(12)C-~(13)C之间的活化能差值(△E_a)有所不同造成的.
The kinetics of vitrinitic hydrocarbon generation under the thermal simulation of gold tube closed system shows that the activation energy varies greatly with the type and structure of the vitrinite.The activation energy of the homogeneous vitrinite is the highest while the vitrinite activation energy The distribution of δ 13 C 1 in the early stage of thermal simulation decreased with the increase of temperature, and gradually increased in the late stage. The higher the temperature was, the higher the temperature was The results show that the vitrinite pyrolysis natural gas carbon isotope fractionation is mainly controlled by time, temperature and total carbon isotope value, while the vitrinite structure and activation energy distribution have a greater impact on carbon isotopic fractionation The tendency of the early δ 13 C 1 decrease may be due to the heterogeneity of vitrinites or the difference in activation energies ~ (12) C ~ (12) C and ~ (12) C ~ 13) C between the activation energy difference (△ E_a) caused by different.