摘要
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。
Through contrasting the existent commonly-used discrimination and division methods the geneses of the CO2 gas collected from the Ordovician subsalt Majiagou formation Ma3 member in well ＊ in the Ordos basin is discussed in the paper. The content of CO2 in the well ＊ is nearly 80 %,the carbon isotope value of CO2 （~13Cco~）is 1.11%v,and that of the emblematical CO2 gas in east China and all volcano eruptible gas is less than -2 %o.The carbon isotope value of CO2 （~13Cco2）in the well ＊ is obviously positive, showing the geneses of CO2 in the well ＊ is different from COz gas in east China, the possibility of mantle-geneses is very low. However the carbon isotope value of dolomite reservoir Ma3 member in the well ~ is 1.26 %v, closeing to the value of the carbon isotope value of COz（~13Cco2）,this reflect the geneses of the CO= gas is possible carbonate pyrogenation.
出处
《石油化工应用》
CAS
2013年第5期77-81,共5页
Petrochemical Industry Application
关键词
奥陶系盐下
CO2气藏
地球化学特征
成因分析
ordovician subsalt
C02 gas poll
geochemistry characteristic
geneses analysis
作者简介
卢蜀秀，女（1979一），工程师，2002年毕业于西南石油学院石油地质专业，一直从事气田开发及管理工作，邮箱：lsxl—cq@petrochina．com．cn。
