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通过对松辽盆地南部长岭断陷典型高含CO2气藏的解剖,对比分析了长深1、长深2、长深4、长深6、长深7等高含CO2气藏的气体成因、分布特征及其差异,指出基底大断裂的活动特征决定了幔源CO2和烃类气成藏条件的相对好坏,从而决定了气藏中CO2的含量及含CO2天然气的赋存层位,建立了长岭断陷高含CO2气藏运聚成藏模式,合理解释了长岭断陷含CO2天然气的勘探现状和复杂分布问题,为CO2和烃类气的钻前预测提供了理论依据。
By analyzing the typical high CO2 gas reservoir in the Changling Fault Depression, southern Songliao Basin, the gas genesis of the high CO2 gas reservoirs in Changshen 1, Changshen 2, Changshen 4, Changshen 6 and Changshen 7 was comparatively analyzed , Distribution characteristics and their differences, it is pointed out that the active features of the basement faults determine the relative quality of the mantle-derived CO2 and hydrocarbon gas accumulation conditions and thus determine the CO2 content in the gas reservoir and the occurrence level of CO2-bearing natural gas, The gas accumulation and accumulation pattern of CO2-bearing gas reservoirs in Changling Fault Depression is established. The exploration status and complex distribution of CO2-bearing natural gas in Changling fault are reasonably explained, which provides a theoretical basis for the prediction of CO2 and hydrocarbon gas before drilling.