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应用黄金管封闭体系热解实验 ,结合GC IRMS同位素质谱仪的甲烷碳同位素分析 ,研究了塔里木盆地库车坳陷侏罗系煤生成甲烷的碳同位素特征及其动力学模拟。结果表明 ,库车坳陷侏罗系煤热解气甲烷碳同位素介于 - 3 6 %～- 2 5 % ;碳同位素与热解温度 (或Ro)、升温速率密切相关 ;煤成甲烷的碳同位素动力学模拟结果与热解实验数据吻合较好 ,表明可以用动力学方法将实验数据外推 ,并应用于地质实际中。模拟结果显示 ,库车坳陷克拉 2气田天然气主要经历了 10Ma(尤其是 5Ma)以来的阶段性聚集。
The carbon isotope analysis of methane in the Jurassic coal in the Kuqa Depression, Tarim Basin, and its kinetic simulation were studied with the carbon isotope analysis of methane in the GC IRMS using gold tube closed system pyrolysis experiments. The results show that the carbon isotopes of methane in the pyrolytic gas of Jurassic coal mine in the Kuqa Depression are between 36% and 25%, and the carbon isotopes are closely related to the pyrolysis temperature (or Ro) and the heating rate. The carbon The results of isotope kinetics simulation are in good agreement with the experimental data of pyrolysis, which indicates that the experimental data can be extrapolated by dynamical method and applied to geological practice. The simulation results show that the natural gas in the Kela-2 gas field in the Kuqa Depression mainly experienced periodic accumulation since 10Ma (especially 5Ma).