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在已获天然气地质地化资料的基础上，重点论述了ＣＯ２天然气地化特征及成因类型，追踪和判识了ＣＯ２气及烃类气的气源，初步探讨了ＣＯ２气的分布特征及控制因素，指出本区ＣＯ２气属壳源型岩石化学成因，气源主要来自莺黄组中、下部含钙海相泥岩，与深部火山—幔源的ＣＯ２气无关，亦不具深源气的特征。因此，预测本区中深部是勘探烃类气为主气藏的重要领域。
On the basis of the geological geochemical data of natural gas, the geochemical characteristics and genetic types of CO2 natural gas are mainly discussed, the gas sources of CO2 gas and hydrocarbon gas are traced and identified, and the distribution characteristics of CO2 gas and the control factors It is pointed out that the origin of CO2 gas is a petrogenetic rock chemistry of CO2 gas in this area. The source of gas is mainly from the middle and lower calcareous marine mudstones in Yinghuang Formation, which are not related to deep volcanic-mantle source CO2 gas nor deep source gas. Therefore, it is predicted that the deep part of this area is an important area for exploration of hydrocarbon-based gas reservoirs.