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Table 1 Hydraulic and thermal properties of the Mesozoic units

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 ]
Jurassic Dogger Middle Marnes sableuses d’Audun-le-Tiche dom4 Average to moderatea 10–3 to 10–5a 10–10 to 10–12 105 to 103 + 70 130 14   
Calcaires d’Audun-le-Tiche            
Calcaire de Haut-Pont dom3           
Calcaire d'Ottange dom2           
Marnes micacées dom1           
Lower Minette dou Average to moderatea 10–3 to 10–5a 10–10 to 10–12 105 to 103 + 11 68 18 1.5 2.2
Liassic Upper   lo6-7           
Argiles et marnes de Grandcourt lo1-5 Lowa 10–5 to 10–7a 10–12 to 10–14 103 to 10 - 100 140? 20 1.1 2.0
Middle Grès médioliasique lm3a+b Moderate to lowa 10–4 to 10–7a 10–11 to 10–14 104 to 10 +/- 35 80 18 1.3 2.0
Couches à Amaltheus margaritatus lm2 Low to very lowa 10–5 to 10–9a 10–12 to 10–16 103 to 10–1 - 80 150? 19 1.2 2.1
Calcaire ocreux lm1 Lowa 10–5 to 10–7a 10–12 to 10–14 103 to 10 - 4 15 16 1.4 2.1
Lower Marne pauvre en fossiles li4 Lowa 10–5 to 10–7a 10–12 to 10–14 103 to 10 - 30 45 9 1.7 2.3
Marnes et calcaires de Strassen li3 Low to very low 10–5 to 10–9 10–12 to 10–16 103 to 10–1 - 8 40 6 1.6 1.8
Grès de Luxembourg li2 Moderate to low 10–4 to 10–7 10–11 to 10–14 104 to 10 + 0 100 17 2.3 3.6
Marnes d'Elvange li1 Low to very low 10–5 to 10–9 10–12 to 10–16 103 to 10–1 - 0 35 8 1.5 1.8
Triassic Keuper Upper Argiles de Levallois ko2 Moderate to very low 10–4 to 10–9 10–11 to 10–16 104 to 10–1 +/- 0 17 9 1.6 2.1
Grès de Mortinsart ko1           
Middle Steinmergelkeuper km3 Low to very low 10–5 to 10–9 10–12 to 10–16 103 to 10–1 - 20 75 8 2.0 2.4
Rote Gipsmergel km2 Low to very low 10–5 to 10–9 10–12 to 10–16 103 to 10–1 - 15 30 9 1.8 2.3
Schilfsandstein km2S Moderate to low 10–4 to 10–7 10–11 to 10–14 104 to 10 +/- 0 50 28? 1.0 1.9
Pseudomorphosenkeuper km1 Low to very low 10–5 to 10–9 10–12 to 10–16 103 to 10–1 - 20 100 11 1.6 2.2
Lower Grenzdolomit ku Low to very low 10–5 to 10–9 10–12 to 10–16 103 to 10–1 - 10 25 12 1.5 2.0
Bunte Mergel            
Basisschichten            
Muschelkalk Upper Ceratitenschichten mo2 Average to moderate 10–3 to 10–5 10–10 to 10–12 105 to 103 + 10 55 2 3.8 3.8
Trochitenschichten mo1           
Middle Linguladolomit mm2 Average to moderate 10–3 to 10–5 10–10 to 10–12 105 to 103 + 0 7 4 3.0 3.3
Gipsmergel mm1 Very low 10–7 to 10–9 10–14 to 10–16 10 to 10–1 - 30 100 5 2.4 2.7
Lower Orbicularisschichten mu2 Moderate to low 10–4 to 10–7 10–11 to 10–14 104 to 10 + 10 50 10 1.8 2.4
Muschelsandstein mu1           
Buntsandstein Upper Voltziensandstein so2 Moderate to low 10–4 to 10–7 10–11 to 10–14 104 to 10 + 50 150 17 1.7 2.8
Zwischenschichten so1           
Middle Vogesensandstein sm Moderate to low 10–4 to 10–7 10–11 to 10–14 104 to 10 + 0 >150 21 1.9 3.0
Lower   su Moderate to low 10–4 to 10–7 10–11 to 10–14 104 to 10 +      
  1. k f - hydraulic conductivity by LGB and LUWG (2010), aIndication of hydraulic conductivity estimated according to bulk lithological composition; K - permeability 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 measured perpendicular to bedding. Thickness, porosity, and thermal conductivity values by Schintgen et al. (2015).