Abstract: Three-dimensional gas reservoir simulators involve a lot of computation and high cost. An implicit pressure explicit saturation approach with Marchuk fractional step algorithm, suitable for bottom water gas reservoir is given in this paper. Three-dimensional simulation of an ideal bottom water gas reservoir model has shown consistent result, high accuracy, good stability, less computational effort, and low cost. This algorithm is recommended for three-dimensional modelling of a bottom water gas reservoir.

摘要： 针对以往气藏三维模拟工作量大,费用高的缺陷,本文介绍了适合底水气藏三维模拟的隐压显饱方法和Marchuk分数步长算法。通过一个设计的理想底水气藏模型的三维模拟计算表明,计算结果合理,具有精度高、稳定性好、工作量小、费用省的优点,是底水气藏三维模拟值得推荐的新算法。