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文章研究了塔里木盆地库车坳陷侏罗系煤系烃源岩在封闭体系下热模拟生成甲烷的碳同位素特征及其动力学参数,探讨了克拉2大气田天然气的成因。碳同位素动力学研究表明,库车坳陷侏罗系煤系烃源岩热模拟生成甲烷的碳同位素值介于-37‰~-25‰之间;可以用动力学方法将煤系烃源岩热模拟实验数据外推,应用于地质条件。克拉2大气田天然气主要来源于中下侏罗统煤系烃源岩,属阶段捕获气,主要聚集了-5~-1 Ma阶段的天然气,其成熟度R(?)为1.3％-2.5％。这不仅得到早期相关研究成果的支持,而且也符合该区天然气的勘探实际。
In this paper, the carbon isotope characteristics and kinetic parameters of methane generated by thermal simulation in a Jurassic coal measure source rock in the Kuqa Depression of the Tarim Basin were studied, and the genesis of natural gas in the Kela 2 gas field was discussed. Carbon isotope kinetics studies indicate that the carbon isotope values of methane produced by thermal simulation in the Jurassic coal measure source rocks of the Kuqa Depression lie between -37 ‰ and -25 ‰, and the coal measures of hydrocarbon source rocks Extrapolation of thermal simulation experimental data, applied to geological conditions. The natural gas in the Kela-2 gas field is mainly derived from the Middle-Lower Jurassic coal-measure source rocks. It belongs to the stage of capture gas and mainly accumulates natural gas in the -5 ~ -1 Ma stage with a maturity R (?) Of 1.3% -2.5% . This is not only supported by the results of earlier related research, but also with the exploration of natural gas in the area.