中国东部二氧化碳气田(藏)的地化特征及成因分析

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GEOCHEMICAL CHARACTERISTICS ANE GENETIC ANALYSIS OF CO₂ FIELDS(POOLS) IN EAST CHINA

Scientific Research Institute of Petroleum Exploration and Development, CNPC Beijing, 10083

摘要: 中国东部油气区发现众多无机成因CO₂气田(藏),CO₂含量一般大于60%,甲烷等烷烃气含量较低,一般小干10%.本文通过二氧化碳碳同位素组成,R/Ra值等地化参数分析,并结合相关气藏地质特征,指出除莺歌海盆地CO₂气田(藏)为变质成因外,中国东部其它CO₂气田(藏)主要为幔原火山─—岩浆成因.
- CO₂气田(藏) /
- 地球化学 /
- 幔源成因 /
- 变质成因 /
- 中国东部
Abstract: Numerous CO₂ fields(pools) of inorganic origin are discovered in east China.Usually their CO₂ contents exceed 6O%,and alkane gas contents are lower than 1O%.After an analysis of geochemical parameter s i.e.carbon isotopic composition and R/Ra value of CO₂,etc,plus a combination of the geological features of the related pools,the paper proposed that except those in Yingge marine basin,which have a metamorphic origin,the rest of CO₂ fields (pools) in east China can be attributed to predominantly an origin of mantle-derived volcano-magma.

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