根据对准噶尔盆地典型低演化阶段侏罗系煤系烃源岩热模拟实验所产烃类气组分碳同位素的分析测试,研究了盆地赋存天然气的类型、热演化程度和赋存的地质条件。认为:盆地腹部陆南凸起以高演化阶段煤型气为主,源岩可能为盆地东部发育的石炭纪煤系;低演化阶段油型气主要赋存在盆地东部油气区;盆地南缘特殊构造地质条件和烃源岩热演化条件是构成不同演化阶段天然气分别聚集或混源聚集的原因。

Based on the studies of molecular and carbon isotope of the nature gases that are from over 40 drillings and gas-seeps of the surface. The systematic studies relate to types and thermal evolution stages and collected conditions of nature gases. Combined with thermal simulation experiments of hydrocarbon source rocks of lower evolution stages from Jurassic coal-measure in the Junggar Basin. The nature gases in the Basin are divided to four types from lower evolution stage to high evolution stage, they are coal-related gas for mature to over mature, oil-related gas for mature, and oil-related gas for over mature. The coal-related gases for over-mature distributed in mainly the Lunan Uplift of the center of the Basin. The nature gases of Qigu gas field belongs to over-mature or lower mature coal-related nature gases, while the gas from Dushanzioil-gas field are mainly the lower mature in the southern of the Basin. Lower-mature oil-related gas is distributed mainly over oil-gas regions in the eastern of basin.