Thermodynamic study on the compositions of fluid phases in the C-O-H system under high temperature and pressure |
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| Authors: | Zhenghua Bai Xianbin Wang |
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| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou
2. Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000, Lanzhou
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| Abstract: | Based on the fluid phase equilibrium of the C-O-H system, the compositions of various fluid phases under high temperatures and pressures have been calculated in terms of the available thermodynamic data and newP-V-T data and on the assumption ofP T= ΣPi in this paper. The results indicate that in this system there are 5 major fluid phases in different proportions at variousT andP. CH4 is the dominant phase (about 70%) under relatively lowerT andP. Its proportion obviously decreases with increasingT, P andfo2. 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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