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Geothermal Energy

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Fig. 11 | Geothermal Energy

Fig. 11

From: Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks

Fig. 11

Stratigraphic log and gamma ray (GR) (after Aichholzer et al. 2016), measured temperature profile T and derived temperature gradient ∆T/∆z (same scale as temperature profile), thermal conductivities λ for dry, hot and wet formations and associated calculated heat flow densities q for the Soultz-sous-Forêts GPK-2 well. Vertical lines indicate mean values for ∆T/∆z (left), λ (middle) and q (right) for a given interval (global (from surface to top of the Muschelkalk), Tertiary, Jurassic and Keuper). Dots indicate average value for a given formation. Stratigraphy is shown in the background for each graph

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