【摘要】 阿克 1井气藏是塔里木盆地西南坳陷新近发现的气藏。其天然气甲烷碳同位素值为 - 2 3.0‰ ,干燥系数超过 0 .999,说明气藏是烃源岩在高—过成熟期阶段聚气的产物。研究结果表明 :喀什凹陷白垩系—第三系和二叠系烃源岩不发育 ,不会是该气藏的烃源岩 ;侏罗系在晚第三纪强烈构造运动之前仅达到成熟阶段 ,难以满足晚期聚气的条件 ,并且阿克 1井气藏所在地区中侏罗统湖相烃源岩干酪根碳同位素值较轻、下侏罗统煤系烃源岩以薄层状分散于厚层砂岩中 ,也不大可能是该气藏的主要烃源岩 ;而石炭系干酪根碳同位素值、成熟度、生烃史等均与阿克 1井天然气对比良好 ,应是阿克 1井的主要气源岩更多还原

【Abstract】 Ake well 1 gas reservoir was found recently in the southwest depression of Talim Basin.The methane carbon isotopic ratio of the gas is -23.0‰ with above 0.999 of dry coefficient, Which indicate the gas reservoir is the result of gas accumulation from hydrocarbon source rock in high to over mature period.Study shows that the hydrocarbon source rock of cretaceous Eogene and Permian is poor developed in Kashi sag and can’t become the source of the gas reservoir.The Jurassic source reached just mature stage before huge sedimentary in Neogen,so it couldn’t meet the conditions of gas accumulation in later period.It may be impossible the gas mainly derived from Jurassic source rock because the kerogen carbon isotope of Middle Jurassic lacustrine source rock is too light and the lower Jurassic coal measure source rock is too thin and dispersed in very thick sand layers.The gas from Ake Well 1 has good correlation with kerogen carbon isotope,maturity,and generating history of Carboniferous source rock.So the gas should be mainly come from Carboniferous source rock.更多还原