【摘要】 利用天然气组分定量、稳定碳同位素组成、流体包裹体显微测温和生烃动力学实验数据,对塔里木盆地库车坳陷克深大气田深层天然气的地球化学特征及成因、储层流体包裹体特征与均一温度、油气充注时间及成藏过程进行研究。结果表明:库车坳陷克深大气田深层天然气以烷烃气为主,甲烷含量占87.30%～98.33%,重烃(C²⁺)含量占0～0.66%,干燥系数达0.99%～1.0%;δ¹³C₁值、δ¹³C₂值分别为-29.3‰～-26.4‰、-21.4‰～-16.1‰,属于过成熟的煤成气。克深大气田白垩系巴什基奇克组储层发育2期烃类包裹体:第Ⅰ期为发蓝白色荧光的液态烃包裹体,指示早期轻质油充注;第Ⅱ期为无荧光的气态烃包裹体,与其共生的盐水包裹体均一温度为145～160℃,为晚期天然气充注。克深大气田主要经历了库车组沉积期末（约2.5Ma）以来的天然气大量充注,气源主要来自克深井区和拜城凹陷生气中心的侏罗系煤系烃源岩,为深埋快速生烃、强源储压差作用下晚期聚集成藏。更多还原

【Abstract】 The geochemical characteristics and genesis of deep-seated natural gas,type features and homogenization temperature of fluid inclusions,charge time of hydrocarbon and accumulation process of the Keshen large gas field in the Kuqa Depression,Tarim Basin were studied,by using the data of the quantification of gas components,carbon isotope compositions,micro temperature measurement of fluid inclusion,and hydrocarbon generation kinetics.The results show that deep-seated natural gas in the Keshen large gas field is dominated by alkanes,of which methane accounts for 87.30%-98.33%,the C_2⁺ content is 0%-0.66%,and the dryness coefficient is 0.99%-1.0%.The δ¹³C₁ and δ¹³C₂ values are from-29.3‰to-26.4‰ and from -21.4‰ to -16.1‰,respectively,indicative of the over mature coal-derived gas.There are two episodes of hydrocarbon inclusions in the Cretaceous Bashijiqike Formation reservoirs in the Keshen large gas field.The first phase inclusion is liquid inclusion with blue-white fluorescence color,which means that the early light oil was charged.The second phase inclusion is gas inclusion with non-fluorescence color.The homogenization temperature of aqueous inclusion symbiosis with gas inclusion is 145-160℃,which indicates that the late gas was charged.The Keshen large gas field has experienced large-scale natural gas charging history since the Late Kuche Formation sedimentary period（about 2.5 Ma）.Natural gas in the Keshen large gas field is mainly originated from Jurassic coal-bearing source rocks in the Keshen well area and center of Baicheng Sag,which is the late accumulation under the actions of rapid hydrocarbon-generation in the deepburied strata and strong pressure difference gradient of resource-reservoir.更多还原