Chapter six analyzes phase equilibrium and phase rule of the polycomponent system using the principle of equilibrium stability. 第六章利用平衡稳定性原理分析了多组分系统的相平衡，相律。
Based on a thermodynamic model of gas_liquid equilibrium, the variation of phase behavior in a volatile oil system during gas injection has been investigated. 根据气液两相相平衡热力学模型研究了某挥发油油藏在注天然气过程中油藏体系相态特征的变化规律。
