收稿日期: 2000-07-21
修回日期: 2000-09-04
网络出版日期: 2000-12-01
ORIGINS OF CARBON DIOXIDE IN PETROLIFEROUS BASINS
Received date: 2000-07-21
Revised date: 2000-09-04
Online published: 2000-12-01
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。近年来大量地球科学研究发现,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。
程有义 . 含油气盆地二氧化碳成因研究[J]. 地球科学进展, 2000 , 15(6) : 684 -687 . DOI: 10.11867/j.issn.1001-8166.2000.06.0684
Carbon dioxide(CO2) geology is one of the frontiers of geoscience. Origins of carbon dioxide in petroliferous basins at least include:①degassing of the undegassed mantle;②degassing of the crustal melt;③thermal decomposition of marine carbonate rock;④thermal decomposition of carbonate cement and⑤decomposition of organic matter. Each of these different carbon dioxide has its special geochemical characteristics. Many studies on CO2 geochemistry show that the carbon dioxides of CO2-high pools in petroliferous basins are from degassing of the undegassed mantle. The CO2 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 CO2 in petroliferous basins.
Key words： Carbon dioxide; Mantle; Petroliferous basin.
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