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中国东部二氧化碳气田(藏)的地化特征及成因分析

石油实验地质

1997年 19卷第3期

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Title

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

作者

李先奇戴金星

Authors

Li Xianqi Dai Jinxing

单位

中国石油天然气总公司石油勘探开发科学研究院, 北京, 100083

Organization

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.

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.

关键词：

CO2气田(藏); 地球化学; 幔源成因; 变质成因; 中国东部;

基金项目

DOI

https://doi.org/10.11781/sysydz199703215