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Fig. 6 | Geothermal Energy

Fig. 6

From: Detailed descriptions of the lower-middle Triassic and Permian formations using cores and gamma-rays from the EPS-1 exploration geothermal borehole (Soultz-sous-Forêts, Upper Rhine Graben, France)

Fig. 6

Photo board of the cores from the upper and middle Buntsandstein, with the Box associated with the cores; this package is correlated to a formation (with the names and boxes concerned). All the cores have a diameter of 78 mm. Box 76, Grès Argileux (upper Grès à Voltzia) composed of micaceous sandstone and dolomitic sandstone alternating with green to red-colored clays and silty clays. Boxes 86 and 94, Grès à Meules (lower Grès à Voltzia) composed of massive clayey sandstone banks with thin micaceous surfaces. Are observed in the Box 96 oblique beddings. In the Box 94, occurrence of nearly vertical fractures, filled with white barite. Boxes 103, 104 and 121, Couches Intermédiaires composed of coarse-grained sandstones with oblique beddings (Box 103 and Box 104) alternating with red to purplish clays and silty clays, with numerous rip-up mud clasts and oxidations zones. Boxes 132 and 150, Poudingue de Sainte-Odile composed of coarse-grained sandstone to true conglomerate, with mostly rounded white milky quartz pebbles and very fine-grained red quartzites. Boxes 189, 195, 215, 251, 254 and 255, Couches de Karlstal: this formation presents two distinct facies with planar sandstone beds alternating with horizontally stratified fine silty clay lamina (milli- to centimetric scale) (Box 254 and Box 255) interpreted as typical playa facies with many desiccation cracks (Box 195 and Box 215), wind/wave ripples and small bioturbations (Box 251). The second facies consists of large oblique tabular and trough cross-beds (Box 189), which looks like aeolian dunes shape. Box 284, Couches de Rehberg composed of coarse-grained sandstones with large cross-beddings. Box 415, Couches de Trifels: medium- to coarse-grained sandstones with various mud clasts (sometimes imbricated and formed by desiccation cracks)

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