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Table 3 Major hydrothermal and petrothermal reservoirs

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

Stratigraphy Mesozoic Permian Devonian Devonian
Buntsandstein Rotliegend Upper+Middle Siegenian Lochkovian
Region Trier-Luxembourg Embayment SE-Luxembourg Graben + Wittlicher Senke Hunsrück (+Mosel region?) Ardennes (+NW Eifel?)
Formations Voltziensandstein+Zwischenschichten+Vogesensandstein Altrich+Kinderbeuern+Ürzig Taunusquarzit Saint-Hubert+Oignies+Fépin
Reservoir lithotype Sandstone+conglomerate Sandstone+breccia/conglomerate Quartzite Sandstone+quartzite
Reservoir type Hydrothermal Hydrothermal/petrothermal Petrothermal Petrothermal
Depth [m] 0 to 1,200 0 to 2,500 0 to 4,000 3,500 to 6,000
Thickness [m] 150 to 300 >1,000 >1,000 1,300 to 2,500
T [°C] 10 to 50 10 to 75 10 to 90 90 to 140
k f [m s–1] 10–4 to 10–7 10–4 to 10–9 10–5 to 10–7 10–5 to 10–7
  1. T - temperature, k f - hydraulic conductivity.