The absolute permeability of the Berea rock is 1.760 ±0.001 Darcy. The
absolute permeability value remains constant under various conditions,
which demonstrates the accuracy and stability of the simulation. The
result obtained from this simulation is slightly different from the
result by the Dong and Blunt (2009), which gives the absolute
permeability value of 1.193 Darcy. The difference might be due to the
difference in size of digital rocks. Dong and Blunt used digital rock
with dimension of 400x400x400 voxels (9.77 mm3 in
actual size), while we used digital rock of 320x320x320 voxels (5.00
mm3 in actual size) is used. The dimension difference
might have caused a slight change in the rock sample heterogeneity. In
addition, Dong and Blunt applied Pore Network Model (PNM) to calculate
the absolute permeability, while in this study, LBM simulation is used.
Nonetheless, the absolute permeability value obtained is still in the
same order as described by the paper.