鄂尔多斯盆地奥陶系盐下二氧化碳气藏成因分析  

Analysis on genesis of carbon dioxide gas reserevoir in ordovician subsalt in ordos basin

作　　者：卢蜀秀 邓军 白海峰[3] 

机构地区：[1]长庆油田公司气田开发处,陕西西安710018 [2]长庆油田公司生产运行处,陕西西安710018 [3]长庆油田公司勘探开发研究院,陕西西安710018

出　　处：《石油化工应用》2013年第5期77-81,共5页Petrochemical Industry Application

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.

关 键 词：奥陶系盐下 CO2气藏 地球化学特征 成因分析 

分 类 号：TE122.1[石油与天然气工程—油气勘探]