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Table 1 X-ray powder diffraction (XRPD) analysis showing quantitative bulk mineralogical composition for the six Muschelkalk samples chosen to represent the variability of the Muschelkalk at exploration well EPS-1 (Soultz-sous-Forêts), and three samples from the Buntsandstein at the Muschelkalk–Buntsandstein interface

From: Petrophysical properties of the Muschelkalk from the Soultz-sous-Forêts geothermal site (France), an important lithostratigraphic unit for geothermal exploitation in the Upper Rhine Graben

Lithostratigraphic unit Formation True vertical depth (m) Box number Anhydrite Dolomite Siderite Calcite Quartz K-feldspar Muscovite/illite Pyrite
Middle Muschelkalk Marnes Bariolées 938.5 6 86 3 7 1 3
Middle Muschelkalk Marnes Bariolées 957 22 88 11 1
Lower Muschelkalk Couches à Orbicularis and Schaumkalk complex 967 32 74 4 18 1
Lower Muschelkalk Calcaires Ondulés 975 45 85 5 1 10
Lower Muschelkalk Wellenmergel and Couches à Térébratules 988 59 26 3 45 10 16
Lower Muschelkalk Wellenmergel and Couches à Térébratules 990 61 68 1 8 3 20
Buntsandstein Grès à Voltzia 1001 76 1 9 58 3 29
Buntsandstein Grès à Voltzia 1005.5 81 4 2 66 10 18
Buntsandstein Grès à Voltzia 1006.5 82 11 4 46 4 35
  1. Values in wt%