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

Table 2

History matched reservoir parameter setting.

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	0.015	ft	CO2 Strain	0.0025
Perm I-Matrix	0.01–0.02	md	CH4 Strain	0.0045
Perm J-Matrix	0.01–0.02	md	Palmer/Mansoori exponent	3
Perm K-Matrix	0.001–0.002	md	CO2 Langmuir Pressure	412	psia
Perm I-Fracture	0.2–0.4	md	CO2 Langmuir Volume	800	scf/ton
Perm J-Fracture	0.2–0.4	md	CH4 Langmuir Pressure	628	psia
Perm K-Fracture	0.02–0.04	md	CH4 Langmuir Volume	652	scf/ton
Porosity-Matrix	0.002–0.004		CO2 Sorption time	140	days
Porosity-Fracture	0.001–0.002		CH4 Sorption time	350	days
Rock compressibility-Matrix	1.00𝐸−06	1/psi	Rock compressibility-Fracture	1.00𝐸−06	1/psi