本文在文献 [1]对均质地层分析结果的基础上 ,用拉氏变换及 stehfest数值反演方法研究了针对双重介质地层井筒储集系数呈线形变化 ,指数变化等情形下有效井径数学模型的近似解 ,绘制相应的典型曲线 ,并对影响曲线形态的参数进行探讨 ,这对于用实际资料进行试井解释时合理使用其早期数据有很好的参考作用。 Based on the results of homogeneous stratum analysis in [1], Laplace transform and stehfest numerical inversion method were used to study the mathematical model of effective borehole diameter under the condition of linear change and exponential change of reservoir coefficient in double media strata Of the approximate solution, draw the corresponding typical curve, and to explore the parameters that affect the shape of the curve, which is a good reference for the rational use of its early data when the well test interpretation with the actual data.