基于自适应性的三维数字岩心构建方法

The Method of Building Digital Core Based on Adaptive Model

根据天然岩心压汞实验数据得到的孔隙大小分布规律,引入形状因子、配位数、孔喉比等微观参数,利用孔隙中轴线原则和岩心自适应性原则进行三维数字岩心构建,采用恒速驱替算法,运用超松弛迭代求解压力算法,计算了三维数字岩心的渗透率值.结果表明:模型计算出的岩心渗透率值与物理模拟实验渗透率值有较好的吻合,所构建三维数字岩心可以用于水驱聚驱模拟计算.

According to the distribution rules of the size of pore from the results of mercury penetration experiment,three-dimensional digital core,in which microscopic parameters such as wettability,shape factor,coordination number and pore throat ratio are considered,is built on the basis of axle wire principle of pore and adaptability principle of rock core.The,value of three-dimensional digital core＇s permeabihty can be calculated by simulating seepage flow of single-phase with the constant speed.The pressure of pores can be calculated through the algorithm of symmetric successive overrelaxation in the simulation.It is indicated that the value of core permeabihty calculated by building the model is consistent with that obtained through performing the experiment.Three-dimensional digital core can be applied to simulate the process of water flooding and polymer flooding.