用分形方法研究水驱前后岩石的孔隙结构

Application of Fractal Method in Studying Variation of Pore Structure in Reservoir Rock before and after Waterflooding.

储集层岩石的孔隙空间具有良好的分形特征,孔隙结构的分形维数可以定量描述孔隙结构的复杂程度。应用分形几何的原理,建立了孔隙分布和毛管压力曲线的分形几何模型,得出了统计参数和分形几何参数之间的相互关系。并根据水驱前后的毛管压力曲线资料计算了水驱前后孔隙结构的分形参数,研究了水驱对孔隙结构变化的影响。计算结果表明,储集层岩石经过水驱后,孔隙结构的复杂程度增加,非均质性增强。

There is fractal property in pore space of reservoir rocks. The fractal dimension can be used to describe quantitatively the complexity of pore structures. According to principle of the fractal geometry,the fractal model for pore size distribution and capillary pressure curve is developed,and a correlation between the statistics and fractal parameters is derived. The fractal parameters of pore structure are estimated based on the capillary pressure data before and after waterflooding to investigate the effect of waterflooding on variation of pore structure. The results show that the pore structure becomes more complex and more heterogeneous after waterflooding.