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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。
According to the analysis and testing of carbon isotopes of hydrocarbon components in the hydrocarbon source rocks of the Jurassic coal source rocks in the typical low evolution stage of the Junggar Basin, the types of natural gas reservoirs, the degree of thermal evolution and the geological conditions . It is concluded that the Luonan uplift in the belly of the basin is dominated by coal gas of high evolution stage and the source rock may be a Carboniferous coal system developed in the eastern part of the basin. The oil-gas of low evolution stage mainly exists in the oil and gas area in the east of the basin. Geological conditions and thermal evolution of source rocks are the reasons for the accumulation of natural gas or the accumulation of mixed sources in different evolution stages.