Research Article
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/psi | Rock compressibility-Fracture | | 1/psi |
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