Table 1 Parametrization of the reference model of the DeepStor site based on average reservoir properties of (former) oil fields in URG, particularly the Leopoldshafen field (Stricker et al. 2020; Banks et al. 2021)

Reservoir permeability (m²)

2.5 × 10^–14b

Permeability of the caprock (m²)

10^{–18 a}

Injection/production flow rate (Ls⁻¹)

2^a

Effective porosity of the reservoir (–)

0.15^b

Effective porosity of the caprock (–)

0.01^a

Thermal conductivity of the reservoir (Wm⁻¹ K⁻¹)

2.5^b

Thermal conductivity of the caprock (Wm⁻¹ K⁻¹)

1.5^b

Volumetric heat capacity of the reservoir (MJm⁻³ K⁻¹)

3.15^c

Volumetric heat capacity of the caprock (MJm⁻³ K⁻¹)

3.30^c

Injection temperature of the cold well (°C)

70^a

Injection temperature of the hot well (°C)

140^a

Young’s modulus (reservoir and caprock) (GPa)

10^d

Poisson’s ratio (–)

0.3^d

Fluid thermal conductivity (Wm⁻¹ K⁻¹)

0.6^a

Fluid specific heat capacity (Jkg⁻¹ K⁻¹)

4200^a

Fluid density (kgm⁻³)

1000^a

Fluid dynamic viscosity (Pas)

4.18 × 10^–4a

Well diameter (m)

0.2159^a