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建立了一个油、气、水三相多组分三维油藏数值模拟模型。用油气状态方程进行流体相平衡和物性参数计算，该模型采用全隐式方法进行求解。与以往不同的是，模型中考虑了ＣＯ２在水中的溶解，并提出了ＣＯ２在水中溶解度的计算方法，同时给出了考虑ＣＯ２在水中溶解后多组分模型求解的离散化方法以及水相物性参数的计算方法。开发和研制了三维三相全组分数值模拟软件，利用该模型对长庆靖安低渗透性油田注气开发过程进行了模拟计算，获得了满意的结果。该模型还可用于挥发性油藏、凝析气藏、注气等开发过程的模拟计算。
A numerical model of oil, gas and water three-phase multi-component three-dimensional reservoir was established. Using the equation of state of the oil and gas to calculate the fluid phase equilibrium and the physical parameters, the model is solved by a total implicit method. Different from the past, CO2 dissolution in water is taken into account in the model, and the calculation method of CO2 solubility in water is proposed. At the same time, the discretization method to solve multicomponent model after CO2 is dissolved in water is given, Calculation method of parameters. The three-dimensional three-component numerical simulation software is developed and developed. The model is used to simulate the gas injection process of Changqing Jing-an low-permeability oilfield, and satisfactory results are obtained. The model can also be used in the simulation of volatile oil reservoirs, condensate gas reservoirs, gas injection and other development processes.