The Description And Numerical Calculation Of Porous Media On Pore Scale Based On Real Core

By using the method of microscopic percolation, this paper study pore structure and percolation characteristic of porous media from pore scale. We get core images from CT experiment of real rock core, then propose a new reconstruction method of pore network model and calculate the distribution of radius of pore body and pore throat. We calculate the permeability of every digital core and have analysis on the relationship between model parameter and the permeability. At last we use percolation theory to calculate the permeability of network model.We divide pore space of porous media as pore body and pore throat. The pore body is equivalent to sphere which is spatial area of pore space, the pore throat is equivalent to channel which is long-narrow space between pore body. We search the sphere with specified radius in pore space to reconstruct the sphere pore body. Then we search the channel which fluid flow from one pore body to another to construct the throat.The image that gets from CT experiment has high cost and limited quantity. To solve this problem, here we use multiple point geological statistics to simulate some more digital core sample. We choose images of real sample as training image, without hard data, by using SNESIM method to simulate another 10 samples of digital cores. We calculate the permeability of every digital core with LBM method and have analysis on the relationship between model parameter and the permeability.At last, we use pore network model parameters which is distribution of pore body radius and pore throat radius to simulate a regular two-dimension network model. By using percolation we calculate the permeability of network model.