Table 2 X-ray powder diffraction (XRPD) analysis showing quantitative bulk mineralogical composition for the twelve sandstones sampled from exploration well EPS-1 at the Soultz-sous-Forêts geothermal site (Alsace, France)

Box number

84

100

157

198

248

299

347

402

453

497

508

540

Depth (m)

1008

1022

1069

1107

1151

1197

1239

1290

1336

1376

1386

1414

Stratigraphic unit

Voltzia

Intermédiaires

Karlstal

Karlstal

Karlstal

Rehberg

Rehberg

Trifels

Trifels

Annweiler

Annweiler

Anté-Annweiler

Quartz

74.5 ± 1.6

78.9 ± 1.7

89.2 ± 0.4

89.0 ± 1.1

90.7 ± 1.2

83.4 ± 2.6

87.8 ± 1.3

86.7 ± 1.6

82.3 ± 1.7

73.3 ± 3.0

70.6 ± 2.8

66.4 ± 4.0

Orthoclase

3.7 ± 1.9

5.6 ± 0.0

4.6 ± 1.1

3.2 ± 0.2

1.9 ± 0.1

1.7 ± 0.2

2.4 ± 0.0

3.0 ± 0.8

4.3 ± 0.6

4.8 ± 0.4

6.9 ± 1.1

4.4 ± 0.9

Microcline

9.3 ± 0.8

9.7 ± 0.5

4.0 ± 1.7

4.6 ± 0.0

4.5 ± 0.2

7.4 ± 0.5

5.9 ± 0.1

6.6 ± 0.3

9.4 ± 0.4

11.1 ± 0.6

13.8 ± 0.5

10.7 ± 0.7

Muscovite/Illite–Smectite

6.0 ± 2.9

5.0 ± 2.5

2.0 ± 0.8

3.2 ± 1.3

2.8 ± 1.3

7.3 ± 3.2

3.8 ± 1.5

3.5 ± 2.1

3.0 ± 1.8

7.8 ± 3.9

8.3 ± 4.5

13.1 ± 6.0

Dolomite

4.7 ± 0.1

1.0 ± 0.3

0.2 ± 0.1

–

–

–

–

–

0.8 ± 0.0

2.1 ± 0.0

–

4.2 ± 0.5

Siderite

1.9 ± 0.2

–

–

–

–

–

–

–

–

–

–

–

Haematite

–

–

–

–

0.2 ± 0.1

0.5 ± 0.1

0.3 ± 0.0

0.3 ± 0.0

0.3 ± 0.1

0.9 ± 0.1

0.5 ± 0.1

1.4 ± 0.1