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Fig. 3 | Geothermal Energy

Fig. 3

From: The influence of hydrothermal brine on the short-term strength and elastic modulus of sandstones from exploration well EPS-1 at Soultz-sous-Forêts (France)

Fig. 3

Backscattered scanning electron microscope (BSE) images for the six sandstones sampled from exploration well EPS-1 at Soultz-sous-Forêts (France). The box number, lithological unit, and depth are given above each image. The insets on each panel show examples of the pore-filling alteration that characterise these samples (see Heap et al. (2017) for further details). a BSE image of sandstone from the Voltzia (box number 84). b BSE image of sandstone from the Intermédiaires beds (box number 100). c BSE image of sandstone from the Karlstal (box number 157). d BSE image of sandstone from the Karlstal (box number 198). e BSE image of sandstone from the Trifels (box number 402). f BSE image of sandstone from the Anté-Annweiler (box number 540). q quartz, f feldspar, s siderite, c clay, d dolomite, b barite

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