3d Reconstruction Of Porous Rock And Numerical Simulations Of Fluid Flow At Mesoscale Levels

Through CT scanning, digitial image processing, statistics, fractal geometry andtopology methods, the properties of porous structure of sandstones are investigatedquantitativly. A fractal descriptor is employed to characterize the complex poremorphologies, and intouduced into an improved simulated annealing algorithm toreconstruct three-dimensional (3D) fractal models of porous rocks. Thereconstruction method is verified through the comparision of the geometrical,topological, statistical, mechanical and seepage properties of the reconstructed andreference porous structure of sandstones.For the investigation of the seepage mechanism of porous rocks,, based on thereconstructed models, finite element mesh models of fracal rocks are obtained andapplied for the simulation of the deformation and failure of rocks under uniaxial andtriaxial compression using FEM. LBM is employed to simulate fluid flow in porousrocks, and the cacualted permeability is compared with the measured data to verifythe LBM program. LBM and FEM are combined to study the influence of thedeformation of porous rock on the fluid flow, which provides a noval and effectivemethod for the quantitative and visiual analysis of the influence of porous rockdeformation on the fluid flow in underground resource exploitation.