Then the kozeny - carmon equation was developed . the new developed fractal model adjusts the measure of the effective pore radius and of the grain radius to the resolution length appropriate for the hydraulic process . the fractal model was applied in the daqing oil field 在此基础上，利用分形基本理论把kozeny - carman方程改进发展，把颗粒半径和有效孔隙半径调整到适于动力传导过程的分辨率尺度，从而建立渗透率的分形模型。
