Thermodynamic study on the compositions of fluid phases in the C-O-H system under high temperature and pressure

被引:0
|
作者
Bai Z. [1 ]
Wang X. [2 ]
机构
[1] Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou
[2] Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou
来源
Chinese Journal of Geochemistry | 1998年 / 17卷 / 2期
基金
中国国家自然科学基金;
关键词
fluid phase; high temperature and high pressure; thermodynamics; nonbiogenesis; natural gas;
D O I
10.1007/BF03166831
中图分类号
学科分类号
摘要
Based on the fluid phase equilibrium and the C-O-H system, the compositions of carious fluid phases under high temperatures and pressures have been calculated in terms of the available thermodynamic data and new P-V-T data and on the assumption of PT = ΣPi in this paper. The results indicate that in this system there are 5 major fluid phases in different proportions at various T and P. CH4 is the dominant phase (about 70%) under relatively lower T and P. Its proportion obviously decreases with increasing T, P and fO2. The results provide sufficient theoretical grounds for discussing the possibility of CH4 formation and the physical-chemical conditions of its stable occurrence and proportion in the geological environment.
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页码:103 / 113
页数:10
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