A vapor-liquid phase equilibrium model for binary CO2-H2O and CH4-H2O systems above 523 K for application to fluid inclusions

作者：Mao, Shide; Duan, Zhenhao^*; Hu, Wenxuan

来源：Journal of Supercritical Fluids, 2009, 50(1): 13-21.

DOI：10.1016/j.supflu.2009.02.007

• CO2-H2O
• CH4-H2O
• Phase equilibria
• Volume
• Fluid inclusion
• Isochore

Accurate prediction of both volumetric and vapor-liquid phase equilibria of binary CO2-H2O and CH4-H2O mixtures with a single equation of state proves to be difficult. In this study we use an activity-fugacity model to predict the vapor-liquid phase equilibria above 523 K and adapt a Helmoholtz model to calculate volumetric properties of these two binary systems. The average deviations of water content in the vapor phase from experimental data are 3.25% and 3.19% for the CO2-H2O and CH4-H2O mixtures, respectively, and the average deviations of gas solubility in liquid phase from experimental data are 4.29% and 3.50%, respectively. The model can find wide applications, and an example is given for the analysis of fluid inclusions in geochemistry.

• 出版日期2009-8
• 单位中国地质大学（北京）; 南京大学; 内生金属矿床成矿机制研究国家重点实验室; 中国科学院地质与地球物理研究所; 地质过程与矿产资源国家重点实验室; 中国科学院地质与地球物理研究所兰州油气资源研究中心