A Field Study on Simulation of CO₂ Injection and ECBM Production and Prediction of CO₂ Storage Capacity in Unmineable Coal Seam

Table 1

Initial reservoir parameters used in the model.

Input parameters	Value	Unit	Input parameters	Value	Unit
Average reservoir depth	1200	ft	Poisson ratio	0.3
Average formation thickness	4	ft	Young's Modulus	125,000	psia
Fracture spacing I/J/K	0.02	ft	CO2 Strain	0.0065
Perm I-Matrix	0.01	md	CH4 Strain	0.0045
Perm J-Matrix	0.01	md	Palmer/Mansoori exponent	3
Perm K-Matrix	0.001	md	CO2 Langmuir Pressure	240	psia
Perm I-Fracture	0.2	md	CO2 Langmuir Volume	890	scf/ton
Perm J-Fracture	0.2	md	CH4 Langmuir Pressure	402	psia
Perm K-Fracture	0.02	md	CH4 Langmuir Volume	452	scf/ton
Porosity-Matrix	0.004		CO2 Sorption time	100	days
Porosity-Fracture	0.001		CH4 Sorption time	100	days
Rock compressibility-Matrix	1.00𝐸−06	1/psi	Rock compressibility-Fracture	1.00𝐸−06	1/psi