Analysis methods for reservoir rock's microstructure

Key words:  reservoir  rock's microstructure  pore size  pore's connectivity  lattice Boltzmann method

Abstract:

Several functions for analyzing reservoir rock^s microstructure were introduced, whose application methods were discussed in detail based on the digital core constructed by simulated annealing algorithm. The results show that the total connectivity of the rock pore can be precisely depicted by connecting volume fraction. Pore-size distribution function gives quantitative characterization of the pore sizes distribution while local porosity distribution function can offer qualitative analysis of the core's homogeneity as well as quantitative assess for the size of the largest grain and pore. Reasonable side length of the measurement cell for core's homogeneity analysis can be suggested by the variance curve of the local porosity fluctuations, and the local percolation probability function can make good qualitative assess for both the pore's connectivity and isotropy. Furthermore, lattice Boltzmann method was introduced to calculate the core's permeability and shows to be a reliable standard to judge the core's quality for its easy application and correct result.