在准噶尔盆地腹部滴水泉凹陷南侧的滴南凸起上发现的大型气田,气藏层位多,储层主要为石炭系火山岩。滴北凸起南面紧邻滴水泉凹陷,北靠乌伦古坳陷,是南、北2个凹陷生成油气运移的有利富集区,但目前勘探尚未获得重大突破,仅在侏罗系和石炭系发现小型气藏。滴北地区天然气来自哪个凹陷目前尚不清楚。文章通过天然气碳同位素与气层抽提物的对比,指出滴北凸起天然气乙烷碳同位素比滴南凸起天然气重,与盆地东部地区典型石炭系来源的天然气相似,气层抽提物地球化学特征与北面乌伦古坳陷石炭系源岩一致,因此应来自北面的乌伦古坳陷。根据储层流体包裹体特征,指出气藏成藏时间在晚白垩世以后。 Large-scale gas fields discovered on the southern drop of the Dalainquan in the abdomen of the Junggar Basin have many layers of gas reservoirs and the reservoirs are mainly Carboniferous volcanic rocks. The northern part of the droplet rises south of the Dushuiquan depression to the north and Ulungu depression to the north. It is a favorable enrichment area for hydrocarbon migration in the south and north two depressions. However, exploration has not yet achieved a major breakthrough, only in the Jurassic and Carboniferous Department found a small gas reservoir. It is not yet clear which depression the natural gas from the northern part of the country comes from. By comparing the carbon isotopes of natural gas with gas extracts, it is pointed out that the isotopic compositions of ethane in northern uplifted natural gas are heavier than that of natural gas from southern uplift, which is similar to the natural gas from the typical Carboniferous in the eastern part of the basin. The chemical features are consistent with the Carboniferous source rocks in the north Wulungu Depression and should therefore originate from the Ulungu Depression in the north. According to the characteristics of reservoir fluid inclusions, it is pointed out that the accumulation time of gas reservoirs was later than Late Cretaceous.