【摘要】 应用黄金管—高压釜封闭体系热模拟实验与GC、GC-IRMS分析技术,结合KINETICS专用软件,对库车坳陷侏罗系煤成气进行了动力学模拟研究。库车坳陷侏罗系煤具有高的产气性,在高演化阶段主要产甲烷气;侏罗系煤热解气甲烷碳同位素为-36‰～-25‰,乙烷碳同位素为-28‰～-16‰;甲烷、C2-C5气态烃的生成活化能分别为(47～64k)calm/ol、(55～72k)calm/ol,频率因子各为5.265×1013s-1、5.388×1018s-1。在此基础上,进一步探讨了克拉2气田天然气的成因。研究认为,克拉2气田天然气属阶段捕获的煤成气,主要聚集了5～1Ma时期的天然气,其成熟度Ro分布范围为1.3%～2.5%。更多还原

【Abstract】 By using the thermal simulation experiment of closed-system gold tube-high pressure vessles and GC GC-IRMS analytical technique combined with the kinetic software the authors were carried out an investigation of the kinetic modeling on Jurassic coal-derived gas in Kuqa Depression.The Jurassic coal in Kuqa Depression has high gas potential and mainly produces methane at the high thermal evolution stage.The carbon isotope ratios of methane and ethane pyrolysed from Jurassic coal are among-36‰～-25‰ and-28‰～-16‰ respectively.The activate energy distributions of methane and C2-C5 gaseous hydrocarbon are among 47～64 kcal/mol 55～72 kcal/mol and their frequency ratios are 5.265 1013s-1 and 5.388×1018s-1 respectively.On the basis of these researches the origin of Kela-2 gas field was preliminary discussed.It is proposed that the natural gas of Kela 2 gas field in Kuqa Depression belongs to the stage-gathered coal-derived gas which was primarily accumulated at 5～1 Ma and the Ro range of its maturity was about 1.3%～2.5%.更多还原