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济阳坳陷是在古生代克拉通背景上形成的陆内拉张盆地；坳陷内的非烃类气藏分布于高青—平南深断裂中南段和阳信次级凹陷西北缘及商店火山岩穹隆构造内。ＣＯ２含量为６８．８５～９８．５９％，Ｈｅ含量为（８４～８４７）×１０－６，ＣＯ２与Ｈｅ呈弱的正相关。ＣＯ２的δ１３Ｃ值为－６．３０‰～－３．３５‰，表明ＣＯ２为无机成因。３Ｈｅ／Ｈｅ的比值为（２．８０～５．２２）×１０－６，表明Ｈｅ来源于地壳和地幔。研究表明非烃类气藏中的ＣＯ２主要为来自地球深部的幔源ＣＯ２，Ｈｅ为壳源与幔源的混合成因
The Jiyang Depression is a continental intracontinental basin formed on the background of the Paleozoic craton. The non-hydrocarbon gas reservoirs in the depression are distributed in the central-southern margin of the Gaoqing-Pingnan deep fault and the northwestern margin of the Yangxin secondary depression, Volcanic dome structure inside. The content of CO2 was 68.85-98.59%, and the content of He was 84- 847 × 10-6. There was a positive correlation between CO2 and He. The δ13C value of CO2 is -6.30 ‰ ~ -3.35 ‰, indicating that CO2 is inorganic. The ratio of 3He / He is (2.80 ~ 5.22) × 10-6, indicating that He is derived from crust and mantle. The study shows that the main source of CO2 in non-hydrocarbon gas reservoirs is mantle-derived CO2 from the deep earth, He is a mixture of crust and mantle source