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Geothermal Energy

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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

Ï• 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).
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