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Table 1 Mean calculated thermal conductivities λ and heat flow densities q for the various intervals in the GRT-1, GPK-1 and GPK-2 geothermal wells

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

WellIntervalMean T (°C)T/∆z (°C/100 m)DryHotWet
Mean λ (W/mK)Mean q (mW/m2)Mean λ (W/mK)Mean q (mW/m2)Mean λ (W/mK)Mean q (mW/m2)
GRT-1Global92.549.071.35 ± 0.20122 ± 191.20 ± 0.18109 ± 181.81 ± 0.19164 ± 20
Tertiary71.599.321.25 ± 0.24117 ± 241.20 ± 0.24112 ± 241.71 ± 0.23159 ± 24
Jurassic132.309.691.49 ± 0.04144 ± 181.22 ± 0.05118 ± 161.90 ± 0.05184 ± 22
Keuper153.257.031.77 ± 0.07125 ± 311.15 ± 0.0781 ± 222.27 ± 0.08160 ± 39
GPK-1Global64.4910.131.40 ± 0.24141 ± 261.25 ± 0.21126 ± 231.85 ± 0.23188 ± 26
Tertiary46.0210.081.25 ± 0.30126 ± 321.23 ± 0.30124 ± 321.71 ± 0.29172 ± 32
Jurassic83.0712.461.50 ± 0.05187 ± 221.32 ± 0.06165 ± 211.91 ± 0.05238 ± 25
Keuper101.548.371.85 ± 0.06155 ± 241.22 ± 0.06102 ± 172.32 ± 0.09194 ± 31
GPK-2Global62.3410.141.33 ± 0.26135 ± 291.26 ± 0.25127 ± 271.78 ± 0.25181 ± 28
Tertiary49.009.781.25 ± 0.31123 ± 331.23 ± 0.32120 ± 331.71 ± 0.31167 ± 33
Jurassic87.6011.821.50 ± 0.05177 ± 211.32 ± 0.06157 ± 201.90 ± 0.05225 ± 25
Keuper100.958.811.82 ± 0.10160 ± 631.31 ± 0.07115 ± 452.26 ± 0.12199 ± 77
  1. Mean measured temperatures and temperature gradients are given for the various intervals [global (from surface to top of the Muschelkalk), Tertiary, Jurassic and Keuper]. Data for dry rocks at ambient temperature (dry), dry rocks at in situ temperature (hot) and saturated rocks at ambient temperature (wet)