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Analysis on genesis of carbon dioxide gas reserevoir in ordovician subsalt in ordos basin
Author(s): 
Pages: 77-81
Year: Issue:  5
Journal: Petrochemical Industry Application

Keyword:  奥陶系盐下CO2气藏地球化学特征成因分析;
Abstract: 通过对CO2成因判识划分方法的对比,采用通常的成因判识划分方法,对鄂尔多斯盆地*井奥陶系盐下马家沟组马三段CO2气体的成因进行了综合判识划分.*井CO2含量高近80%、碳同位素值δ13CCO2、为1.11‰,而中国东部典型CO2气藏的δ13CCO2均小于-2‰,所有火山喷发气体δ13CCO2也小于-2‰.*井δ13CCCO2明显偏正,说明与东部CO2气体的成因明显不同,幔源成因的可能性较小.*井马三段白云岩储层δ13C值为1.26‰,与CO2气δ13CCO2的值近似相等,反映碳酸盐岩热解气成因的可能性更大.
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