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Table 3 Comparison of thermal data from the DGE-1 well with other deep boreholes drilled in the crystalline upper crust

From: Evaluation of the Lund deep geothermal exploration project in the Romeleåsen Fault Zone, South Sweden: a case study

  DGE-1 Gravberg-1a Outokumpu
R-2500b
KTB borehole, Germanyc Hunt well, Western Canadae LZ borehole, Chinaf
Depth, m 3700 6957 2516 1500 4000 3518 2363
Temperature, °C 85 116 40 40 119 95 47
Q, mW/m2 58g 50 40–45 55 85 72 51
Gradient, °C/km 22–24 14–18 14–17 21 28 24 20
K, W/(m K) 2.5–3.6 3.4 2.5–3.3 2.5–3.6d 2.2–3.6 2.5
A, μW/m3 5.8g 2–5 1.6–5.4 0.8–6.3d 0.9 2.9–3.4
Dominating rock types Gneiss,
granite,
metabasite
Granite Metasediments Pegmatitic granite,
ultramafic rocks
Paragneiss,
hornblende gneiss,
amphibolite
Gneiss,
granite
Gneiss,
granite mylonite
  1. a Aldahan et al. (1991), bKukkonen et al. (2011), cEmmermann and Lauterjung (1997), dSzalaiová et al. (2015), eMajorowicz et al. (2014), fJiang et al. (2016), gWeighted average