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中国东部盆地带CO_2气藏发育,产出层位第三系至奥陶系,储集岩为砂岩、碳酸盐岩及火山岩,CO_2含量为62.86％～99.55％。松辽、渤海湾、苏北、三水及珠江口等中新生代伸展盆地中CO_2气藏之δ~(13)C_(CO_2)。值为-2.65‰～-8.83‰,主区间为-3.5‰至-6.0‰,~3He/~4He值为2.54R_a～4.96R_a。莺歌海盆地CO_2气藏的δ~(13)C_(CO_2)值为-3.80‰,~3He/~4He值为0.07R_a,为壳源变质热分解成因。幔源-岩浆成因CO_2气分布于中新生代伸展盆地中,其释放受NE～NEE向伸展断裂和NW～NWW向断裂交汇带控制,并沿前者运移、聚集成藏。晚第三纪至第四纪NW向构造一岩浆岩带的发育是中国东部又一幔源-岩浆气释放期,对区内CO_2气藏具有重要贡献。变质成因CO_2的生成主要与压扭性断裂的剪切增温和动力变质作用有关。
The CO_2 gas reservoirs in the east China basin developed with the production of the Tertiary to the Ordovician, and the reservoir rocks were sandstone, carbonate rock and volcanic rock with CO 2 content of 62.86% -99.55%. Δ 13 C_ (CO 2) in CO_2 gas reservoirs in Mesozoic-Cenozoic extensional basins such as Songliao, Bohai Bay, northern Jiangsu, Sanshui and Zhujiang Estuary. The value ranged from -2.65 ‰ to -8.83 ‰, the main range was -3.5 ‰ to -6.0 ‰, and the value of ~ 3He / ~ 4He was 2.54Ra ~ 4.96R_a. Δ_ (13) C_ (CO_2) value of CO_2 gas reservoirs in Yinggehai Basin is -3.80 ‰, and the value of ~ 3He / ~ 4He is 0.07R_a, which is the origin of crustal metamorphism thermal decomposition. The mantle-magmatic origin of CO 2 gas is distributed in the Mesozoic-Cenozoic extensional basins. The release is controlled by the NE-NEE extensional faults and the NW-NWW trending faults, and migrates and accumulates along the former. The Late Quaternary to NW tectonic-magmatic belt development is another mantle source-magmatic gas release period in eastern China, which has an important contribution to the CO 2 gas reservoir in the area. The formation of metamorphic CO 2 is mainly related to shear warming and dynamic metamorphism of compressive-torsional fractures.