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CH_4、C_2H_6、CO_2、H_2S、N_2等气体是很多富水地质流体的重要组成部分。从模型的研究方法上,气体溶解度模型大体上又可分为:(1)γ-φ(活度-逸度模型)。模型中的活度系数方程用于表达液相行为,而气相组分的逸度系数由状态方程计算。(2)φ-φ模型。使用某一状态方程同时描述液相和气相的性质。对Duan的模型进行讨论,通过Duan的公式计算CH_4和CO_2在水溶液中的溶解度。按照水溶液中溶解的气体组分数量,又可将气体溶解度模型划分为两类:(1)单组分气体溶解度模型。(2)混合气体溶解度模型。研究者们开发的各种模型适用的温度压力和盐度范围各不相同,精度大小也有差异。
CH 4, C 2 H 6, CO 2, H 2 S, N 2 and other gases are important components of many water-rich geological fluids. From the model research methods, the gas solubility model can be roughly divided into: (1) γ-φ (activity - fugacity model). The activity coefficient equation in the model is used to express the liquid phase behavior, while the fugacity coefficient of the gas phase component is calculated from the state equation. (2) φ-φ model. Use a state equation to describe the properties of both liquid and gas phases. Duan’s model was discussed and the solubility of CH 4 and CO 2 in aqueous solution was calculated by Duan’s formula. According to the amount of dissolved gas components in aqueous solution, gas solubility model can be divided into two categories: (1) single-component gas solubility model. (2) mixed gas solubility model. The models developed by researchers have different ranges of temperature pressure and salinity, and different precision.