Study on mechanism of LNAPL in porous media using Lattice Boltzmann Method with two-phase model and image analysis

Abstract

2D Granulometric method analyzed pore structure of CT images in 2 dimensions obtained from X-ray CT scanner.　Then, Lattice Boltzmann Method for two-phase flow using Shan and Chen model was applied to same images analyzed for in-situ simulation. Flow condition with a capillary number of 10^-4 at inlet did not give enough pore pressure to seepage into pore size less than 9 voxels. Meanwhile, it was confirmed that the flow condition with a capillary number of 10^-3 at inlet could give enough pore pressure which LNAPL could seep into the pore with less than 9 voxels. Hence, it was concluded that capillary number was important index to evaluate two-phase flow in porous media with various pore space.