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

The streamlines are quite tortuous, and continuous pathways from the inlet to the outlet are quite few, resulting in quite low permeability of shales.

Nanoscale simulation of shale transport properties using the lattice Boltzmann method: permeability and diffusivity   Li Chen1,2, Lei Zhang3, Qinjun Kang2, Hari S. Viswanathan2, Jun Yao3 & Wenquan Tao1   1Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China, 2Earth and

Subcontinuum mass transport of condensed hydrocarbons in nanoporous media

Left: In bulk, molecular diffusion is well described by the hydrodynamic Stokes–Einstein relation Ds=μkBT=kB/(4πZη0) (with slip boundary conditions). The effective particle diameter 2R0 is consistent with σCH2 —independently of the alkane length—because the diffusive motion is mostly in longitudinal direction. Right: In contrast, in the nanopores, movement of alkane molecules is dominated by friction on the carbon matrix, corrected for the free volume accessible to the molecule (green sphere). The total friction force is a sum of the forces between the individual monomers with the pore wall—therefore scaling linearly with the alkane length. v stands for the molecule velocity.

Subcontinuum mass transport of condensed hydrocarbons in nanoporous  media   Kerstin Falk1, Benoit Coasne1, Roland Pellenq1, Franz-Josef Ulm1 & Lyderic Bocquet1,w   Abstract Although hydrocarbon  production from unconventional reservoirs, the  so-called shale gas, has exploded recently, reliable predictions of resource availability and extraction are missing because conventional tools fail to account  for their ultra-low permeability

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