含油气盆地二氧化碳成因研究  

ORIGINS OF CARBON DIOXIDE IN PETROLIFEROUS BASINS

作　　者：程有义[1] 

机构地区：[1]胜利油田东胜精攻石油开发有限公司,山东东营257000

出　　处：《地球科学进展》2000年第6期684-687,共4页Advances in Earth Science

摘　　要：CO2 地质问题是当今地球科学的前沿和热点问题。含油气盆地 CO2 的成因至少包括 :1未脱气地幔岩浆脱气作用 ;2地壳岩石熔融脱气作用 ;3海相碳酸盐岩热分解作用 ;4碳酸盐胶结物热分解作用 ;5有机成因的 CO2 。这些不同来源的 CO2 各有其地球化学特征。近年来大量地球化学研究发现 ,全球含油气盆地已发现的高含 CO2 气藏中 CO2 主要是由未脱气地幔的脱气作用贡献的。这种成因 CO2 具有典型 - 4‰ (PDB)的碳同位素组成特征。未脱气地幔在地球演化过程中几乎没有进行过脱气或组分分异 ,它保持着原始地幔的富气特征 ,其含气丰度约是脱气地幔含气丰度的99倍。因此 ,未脱气的幔源岩浆脱气作用成为含油气盆地 CO2 的最主要来源。Carbon dioxide(CO 2) geology is one of the frontiers of geoscience. Origins of carbon dioxide in petroliferous basins at least include: ① degassing of the undegassed mantle;② degassing of the crustal melt;③ thermal decomposition of marine carbonate rock;④ thermal decomposition of carbonate cement and ⑤ decomposition of organic matter. Each of these different carbon dioxide has its special geochemical characteristics. Many studies on CO 2 geochemistry show that the carbon dioxides of CO 2 high pools in petroliferous basins are from degassing of the undegassed mantle. The CO 2 has a type of 4‰(PDB) of the carbon isotope composition. The undegassed mantle doesn't degas and keeps the gas rich feature of the primitive mantle and is 99 times of gas content of the degassed mantle. Therefore, degassing of the undegassed mantle is the main source of CO 2 in petroliferous basins.

关 键 词：二氧化碳 地幔 含油气盆地 

分 类 号：P618.130.2[天文地球—矿床学] TE121.1[天文地球—地质学]