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Fig. 11 | Geothermal Energy

Fig. 11

From: Crystallization of calcium carbonate in a large-scale push–pull heat storage test in the Upper Jurassic carbonate aquifer

Fig. 11

Typical carbonate crystals during \({T}_{\mathrm{Inj}} = 110\,^{\circ }\hbox {C}\): SEM picture (left) and corresponding EDX spectrum resp. mapping (right). Examples for injection (Picture 2) and production at \(37\,^{\circ }\hbox {C}\) (Picture 1) \(60\,^{\circ }\hbox {C}\) (Picture 3). All pictures at these injection temperatures show acicular aragonite crystals

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