Skip to main content

Science – Society – Technology

Geothermal Energy Cover Image

Table 2 Hydraulic and thermal properties of the Paleozoic formations

From: Exploration for deep geothermal reservoirs in Luxembourg and the surroundings - perspectives of geothermal energy use

Stratigraphy Geological unit/formation Hydraulic conductivity k f K Aquifer H ϕ tot λ
Min. Max. Dry Sat.
[m s –1 ] [m 2 ] [mD] [m] [m] [%] [W m –1 K –1 ]
Permian Rotliegend   Altrich-Formation rA Moderate to very low 10–4–10–9 10–11–10–16 104–10–1 +/- 300 400 15 1.6 2.7
  Kinderbeuern-Formation rK Moderate to low 10–4–10–7 10–11–10–14 104–10 + 350 450 18 2.0 3.2
  Ürzig-Formation Low to very low 10–5–10–9 10–12–10–16 103–10–1 - 200 350 12 2.1 2.9
Devonian Emsian Upper Wiltz Fm. E3 Low to very low 10–5–10–9 10–12–10–16 103–10–1 - 250 >1,200 - 2.1 2.5
  Berlé Fm. q Moderate to low 10–4–10–7 10–11–10–14 104–10 +/- 0 15 - 4.5 6.2
Middle Clervaux Fm. E2 Low to very low 10–5–10–9 10–12–10–16 103–10–1 - 200 660 - 2.9 3.3
Lower Schuttbourg Fm. E1b Low to very low 10–5–10–9 10–12–10–16 103–10–1 - 750 1,200 - 2.9 3.5
  Stolzembourg Fm. E1a Low to very low 10–5–10–9 10–12–10–16 103–10–1 - 700 900 - 2.7 3.2
Siegenian Upper La Roche Fm. Sg3/LAR Low to very low 10–5–10–9 10–12–10–16 103–10–1 - >1,400 1,500 - 2.5 2.9
   Sg3a/LAR Low to very lowa 10–5–10–9a 10–12–10–16 103–10–1 -   400 - 2.6 3.2
Middle Villé Fm. Sg2/VIL Low to very lowa 10–5–10–9a 10–12–10–16 103–10–1 - 250 550 - 3.0 3.5
Lower Mirwart Fm. Sg1/MIR Low to very lowa 10–5–10–9a 10–12–10–16 103–10–1 - 700 1,050 - 2.8 3.4
Lochkovian Upper Saint-Hubert Fm. STH Lowa 10–5–10–7a 10–12–10–14 103–10 +/- 550 700 - 3.3 3.9
  Oignies Fm. OIG Low to very lowa 10–5–10–9a 10–12–10–16 103–10–1 - 700 1,200 - 2.6 3.0
Lower Fépin Fm. FEP Lowa 10–5–10–7a 10–12–10–14 103–10 +/- 20 >300 - 3.7 4.3
  1. k f - hydraulic conductivity by LGB and LUWG (2010); aIndication of hydraulic conductivity estimated according to bulk lithological composition; K - permeability calculated for a temperature of 20°C, ‘+’, ‘-’, and ‘+/-’ indicate whether a unit is known, not known, or partly known to have aquifer quality, respectively; H - common thickness range, ϕ tot - total porosity, λ - thermal conductivity in dry (Dry) and water-saturated (Sat.) conditions. Thickness, porosity, and thermal conductivity values by Schintgen et al. (2015). For the Rotliegend formation, thickness and thermal conductivity are based on data by Häfner et al. (2007).