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Title: Nanoscale simulation of shale transport properties using the lattice Boltzmann method: Permeability and diffusivity

Here, porous structures of shales are reconstructed using the markov chain monte carlo (MCMC) method based on scanning electron microscopy (SEM) images of shale samples from Sichuan Basin, China. Characterization analysis of the reconstructed shales is performed, including porosity, pore size distribution, specific surface area and pore connectivity. The lattice Boltzmann method (LBM) is adopted to simulate fluid flow and Knudsen diffusion within the reconstructed shales. Simulation results reveal that the tortuosity of the shales is much higher than that commonly employed in the Bruggeman equation, and such high tortuosity leads to extremely low intrinsic permeability. Correction of the intrinsic permeability is performed based on the dusty gas model (DGM) by considering the contribution of Knudsen diffusion to the total flow flux, resulting in apparent permeability. The correction factor over a range of Knudsen number and pressure is estimated and compared with empirical correlations in the literature. We find that for the wide pressure range investigated, the correction factor is always greater than 1, indicating Knudsen diffusion always plays a role on shale gas transport mechanisms in the reconstructed shales. Specifically, we found that most of the values of correction factor fall in the slip and transition regime, with nomore » Darcy flow regime observed.« less
 [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [4]
  1. Xi'an Jiaotong Univ., Shaanxi (China); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. China Univ. of Petroleum, Shandong (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Xi'an Jiaotong Univ., Shaanxi (China)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
51406145; 51136004; 51320105004
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Nature Science Foundation of China
Country of Publication:
United States
36 MATERIALS SCIENCE; applied physics; fluid dynamics