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有机成因σ_(13)Cco_2值小于—10‰,无机成因σ_(13)Cco_2值则大于—8‰;天然气中CO_2含量大于60％是无机成因的,小于此值有机的、无机的和混合的成因均有。CO_2含量90％以上称C0_2气藏、90％～60％叫亚CO_2气藏、60％～15％为高含CO_2气藏、15％以下为含CO_2气藏。我国东部已发现万金塔气田、花沟气藏、黄桥气田和平方王气顶气藏等一批无机成因的CO_2气藏。其中黄桥和万金塔气田已开发。最后,研究了无机成因CO_2气藏的特征。
The organic genesis σ_ (13) Cco_2 value is less than -10 ‰, the inorganic origin σ_ (13) Cco_2 value is greater than -8 ‰, and the CO_2 content in natural gas more than 60% is inorganic, and less than this organic, inorganic and mixed There are causes. More than 90% of CO 2 content is called C0_2 gas reservoirs, 90% -60% are called sub-CO_2 gas reservoirs, 60% -15% are high-CO_2 gas reservoirs and less than 15% are CO_2 gas reservoirs. A number of CO 2 gas reservoirs of inorganic origin have been discovered in the eastern part of China, such as the Wanjinta gas field, the Huagou gas reservoir, the Huangqiao gas field and the Wangfang gas capitals. Huangqiao and Wanjintha gas fields have been developed. Finally, the characteristics of CO_2 gas reservoirs with inorganic origin were studied.