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阐述了库车坳陷天然气地球化学特征,并应用碳同位素动力学研究结果,探讨了库车坳陷天然气的成熟度和气源。库车坳陷天然气有湿气、凝析气和干气多种类型;天然气具有由西向东、由北向南甲烷含量减少、干燥系数减小的趋势;天然气主要属煤成气,来源于中生界烃源岩。库车坳陷不同构造带天然气的成熟度差异较大,R_o值从0.7%变化到2%以上。克拉2气田天然气R_o值为1.3%～2.5%。综合目前多方面资料分析,库车坳陷天然气的主力气源岩应是侏罗系煤系烃源岩,三叠系烃源岩的气源贡献次之。
The geochemical characteristics of natural gas in Kuqa Depression are expounded. The results of carbon isotope kinetics are also discussed. The maturity and gas source of natural gas in Kuqa Depression are discussed. There are many types of natural gas in the Kuqa Depression, including natural gas, gas condensate and dry gas. The natural gas has a trend of decreasing from west to east and from north to south to decreasing the drying coefficient. Natural gas is mainly coal-derived gas, Source rocks. The maturity of natural gas in different tectonic zones in Kuche Depression varies greatly, and the R_o value changes from 0.7% to over 2%. The R_o value of natural gas in Kela-2 gas field is 1.3% ~ 2.5%. Based on various data analysis, the main gas source rock of the Kuqa Depression should be the Jurassic coal measure source rock, and the Triassic source rock gas source contribution.