【摘要】 以我国东部及南海西部陆缘众多CO2气藏为依据,分析了气藏中气体组分、同位素组成及分布特征,指出该地区从北至南分布着一巨型北东向岩浆 幔源无机成因CO2气藏带,莺歌海盆地中具有壳幔混源特征,其形成机理与欧亚板块和太平洋板块碰撞俯冲带所形成的构造 岩浆作用有关;靠近俯冲带,热源体以火山岩体、基性玄武岩为主,远离俯冲带则以泥底辟热流体为主;超壳断裂是幔源气和热源的输运通道。更多还原

【Abstract】 The authors indicate that there is a big inorganic CO₂ belt oriented to northeast based on analyzing CO₂ compositions, their origins and their distribution features. The belt in genetic mechanism is related to the tectonic-magma process colliding between Europe block and Pacific block. The thermal sources are the lavas and the basalt veins near the dived belt but the diapiric structures are farther away from it. The deep faults are the transportation systems of the mantle gases and the thermal sources.更多还原