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Table 2 Specific heat capacity values [kJ/(kg·K)] at different temperatures (25, 80, 100, 200 °C) and for extrapolated temperatures at reservoir depths 3000 m (103 °C) and 3500 m (117 °C), respectively

From: Geothermal energy from the Main Karoo Basin? New insights from borehole KWV-1 (Eastern Cape, South Africa)

Sample location Lithology T = 25 °C T = 80 °C T = 100 °C T = 200 °C T = 103 °C T = 117 °C
KWV-1 (borehole) Siltstone 0.80 0.88 0.91 1.06 0.92 0.94
KWV-1 (borehole) Very fine-grained sandstone 0.80 0.87 0.89 1.02 0.90 0.92
KWV-1 (borehole) Fine-grained sandstone 0.80 0.86 0.88 1.00 0.88 0.90
KWV-1 (borehole) Medium-grained sandstone 0.77 0.83 0.86 0.97 0.86 0.88