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黄桥地区奥陶系至二叠系发现高浓度CO_2气藏,志留系和泥盆系还含少量凝析油(比重0.7716)。气样经分析含CO_2 80—90%,N_2 5%±,CH_4少量,δ~(13)C_(co_2)为-287——5.88‰。本区古生代地层曾经历过深成作用阶段后期(凝折油阶段)和变质作用阶段早期(石油裂解阶段)的过程。CO_2是由古生代地层中的有机质和原油经热裂解后高度转化而成。并和地层中的碳酸盐岩热解产生的气体混合,是一种混合成因的气体。
High-concentration CO_2 gas reservoirs were found in the Ordovician to Permian in the Huangqiao area. Silurian and Devonian also contained a small amount of condensate (specific gravity 0.7716). Gas samples were analyzed with CO 2 80-90%, N 2 5% ±, CH 4 small amount, δ 13 C 2 - 58.8 ‰. The Paleozoic strata in this area have undergone the process of late stage of deep-deeping (condensed oil stage) and early metamorphic stage (petroleum cracking stage). CO 2 is formed by the high degree of conversion of organic matter and crude oil in the Paleozoic strata after thermal cracking. And is mixed with the gas produced by the carbonate pyrolysis in the formation, which is a gas of mixed origin.