海拉尔-塔木查格盆地中部断陷带CO_2气藏中CO_2成因分析  

Genetic analysis of CO_2 in CO_2 gas reservoirs of middle fault zone of Hailaer-Tamtsag Basin

作　　者：张铜磊[1,2] 陈践发[1,2] 朱德丰[3] 赵兴齐[1,2] 

机构地区：[1]中国石油大学地球科学学院,北京102249 [2]中国石油大学油气资源与探测国家重点实验室,北京102249 [3]大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《中国石油大学学报（自然科学版）》2012年第2期68-75,80,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：大庆油田有限责任公司勘探开发院资助项目(2007-JS-10435)

摘　　要：以海拉尔-塔木察格盆地中部断陷带CO2气藏中的CO2为研究对象,通过组分分析、碳同位素及氦、氩同位素分析,结合研究区CO2含量和同位素数据及他人研究成果,利用排除法探讨研究区CO2的成因及来源。结果表明:研究区CO2平均含量大于85%,CO2稳定碳同位素偏轻,δ13CCO2为-13.1‰～-8.8‰,为目前已发现的具有较为特殊碳同位素组成特征的CO2气藏;尽管CO2稳定碳同位素偏轻,但通过排除法可以证明该区CO2为无机成因气的结论最为合理,且CO2应来源于上地幔岩浆脱气。Based on the research of the CO2 gas reservoir in the middle fault zone of Hailaer-Tamtsag Basin,the origin of CO2 was researched using the exclusive method by composition analysis of carbon,helium and argon isotope,data of CO2 amount and the research achievements of CO2 gas by the scholars.The results show that the average content of CO2 in the study area is more than 85%,and the value of the δ13CCO2 ranges from-13.1‰ to-8.8‰.With the characteristic of light δ13CCO2,the gas reservoir is the scarce one with a special isotopic composition.Though carbon isotopic value is relatively light,the origin of CO2 still can be identified as upper-mantle gas degassed from magma.

关 键 词：海拉尔-塔木察格盆地 中部断陷带 二氧化碳 成因 排除法 

分 类 号：TE132.1[石油与天然气工程—油气勘探]