Skip to main content

Science – Society – Technology

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

Ï• 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

 

Ãœrzig-Formation

rÜ

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).