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Fig. 7 | Geothermal Energy

Fig. 7

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

Fig. 7

a Thermal conductivity of the samples in the dry state at ambient temperature (empty circles) and in the saturated state at ambient temperature (filled circles) as a function of porosity. Lines join the dry and saturated conductivity values for the same sample and arrows indicate the direction of variation from dry to saturated. Colors indicate the lithology. b Effect of water saturation on thermal conductivity as a function of porosity of individual samples. Trendline and corresponding equation and coefficient of determination, R2, are given. c Comparison of thermal conductivities measured under dry state (λdry) and water-saturated state (λwet). Trendline and corresponding equation and coefficient of determination, R2, are given. The equation of the trendline is used for wet thermal conductivity estimates for samples measured only in the dry state

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