Subsurface Fluid Injection and Energy Storage
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Table 3

Geological formation properties, initial reservoir conditions, and the injection, production and reinjection parameters used in the simulation studies of the base case.

Parameters Aquifer Aquitard
Geological formation
 Porosity (–) 0.3 0.1
 Permeability (mD) 50 0.001
 Pore compressibility (Pa−1) 4.5 × 10−10 4.5 × 10−10
 Thickness (m) 540 160
 Rock grain density (kg/m3) 2450 2000
 Rock grain specific heat (J/kg °C) 1000 1000
 Thermal conductivity of the rock formation (W/m °C) 2.1 2.1
Initial reservoir conditions
 Pressure Hydrostatic pressure gradient
 Temperature gradient (°C/100 m) 2.5
 Salinity (g/L) 1.8
Boundary conditions
 Top boundary Average annual surface temperature 12 °C, no mass flow
 Bottom boundary No mass and heat flow (BB1)
 Lateral boundary Open with heat and mass flow
Injection, production and reinjection strategy
 Well configuration Two production and two water reinjection wells with another CO2 injection well (Type I)
 CO2 injection pressure at the bottom hole (MPa) 30
 CO2 injection temperature at the bottom hole (°C) 10
 Hot water production rate (kg/s) 2
 Cooled geothermal water reinjection enthalpy (kJ/kg) 42
 Cooled geothermal water reinjection rate (kg/s) 2

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