The Role of Coal Mechanical Characteristics on Reservoir Permeability Evolution and Its Effects on CO₂ Sequestration and Enhanced Coalbed Methane Recovery

Table 7

Parameters used to the original R-C model.

Parameters	Value
Coal rank	Subbituminous coal
Initial fracture compressibility (, MPa^-1)	0.168
Fracture compressibility change rate (, MPa^-1)	0.359
Initial porosity ()	1.5
Poisson’s ratio ()	0.339
Young’s modulus ()	2713
Langmuir strain constant of CO2 ()	0.03527
Langmuir pressure constant of CO2 (, MPa)	3.82
Langmuir strain constant of CH4 ()	0.00931
Langmuir pressure constant of CH4 (, MPa)	6.1
Langmuir strain constant of N2 ()	0.00305
Langmuir pressure constant of N2 (, MPa)	7.72