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煤层气数值模拟是以计算机为支持条件，模拟煤层气产出的全过程。基本步骤是：首先根据煤储层的地质特征，建立合理的地质模型；并据煤层气产出机理，建立能描述煤层气运动过程基本物理现象和边界条件、初始条件的数学模型，再离散化成数值模型；然后编制成计算机程序，建立计算机模型。文中介绍的煤层气数值模拟方法能全面、系统地综合分析各种影响因素，客观反映流体在储层中的流动特性，并具有开发成本低、可重复进行的特点。

GEOLOGICAL AND MATHEMATICAL MODELS OF NUMERICAL SIMULATION OF COALBED GAS

The numerical simulation of coalbed gas is to simulate the overall process of yielding coalbed gas by taking computer as the supporting conditions.The basic steps are:firstly to set up a reasonable geological model according to the geological characteristics of coal reservoir;then to set up a mathematical model,which can describe the basic physical phenomena of coalbed gas movement and the boundary and initial conditions,in light of the mechanism of yielding coalbed gas,and to transform the mathematical model into the numerical model by the methods of discrete mathematics;and then to set up a computer model through programming.By use of the coalbed gas numerical model method introduced in the paper,various influence factors can be overall,systematicallly and comprehensively analyzed and the flow property of the fluids in reservoir can be objectively reflected.In addition,the method is of the properties of low development cost and to be repeatedly utilized.