Influences of Coal Properties on the Principal Permeability Tensor during Primary Coalbed Methane Recovery: A Parametric Study

Figure 6

2D contours showing distribution of rebound pressure within the 2DDP domain for Cases 4, 5, and 6. Domain I represents the region where the rebound pressure is greater than 5.0 MPa and the principal permeabilities increase monotonically with a depletion in the pore pressure. Domain II represents the region where the rebound pressure is 0.0–5.0 MPa and the principal permeabilities vary nonmonotonically with a depletion in the pore pressure. Domain III represents the region where the rebound pressure is lower than 0.0 MPa and the principal permeabilities decrease monotonically with a depletion in the pore pressure.