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二氧化碳(CO_2)地质研究处于刚刚起步阶段,在成因判识、地质源库脱气作用及成藏规律方面取得了一系列进展。CO_2成因判识可概括为组分含量/比值特征辨识和同位素辨识2个方面。CO_2地质源库有幔源岩浆、火山岩、碳酸盐岩和有机质4种,不同气源的脱气量、脱气方式及成藏贡献不同。CO_2气藏晚期成藏,主要受岩浆活动、气源断裂体系、上涌地幔和壳内高导低速体的制约。建议加强幔源—岩浆气源体的脱气机理和演化的基础研究,其次是幔源—岩浆气源体脱气与气源断裂系的耦合研究。
Carbon dioxide (CO2) geological research is in its infancy, and a series of progresses have been made in the identification of causes, the degassing of geologic source reservoirs and the law of hydrocarbon accumulation. The identification of CO 2 genesis can be summarized as two aspects of component content / ratio feature identification and isotopic identification. There are four types of mantle magma, volcanic rock, carbonate rock and organic matter in the CO_2 geo-source reservoir. The amounts of degassing, degassing and accumulation of different gas sources are different. Late accumulation of CO2 gas reservoirs is mainly controlled by magmatic activity, gas source fracture system, upwelling mantle and high velocity low velocity body in the crust. It is suggested to strengthen the basic research on the degassing mechanism and evolution of the mantle source-magmatic gas source body, followed by the coupling study of the degassing of the mantle source-magma gas source body and the gas source fracture system.