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Table 4 Comparison of thermal data from the FFC-1 well with other deep boreholes drilled in the crystalline upper crust

From: Evaluation of deep geothermal exploration drillings in the crystalline basement of the Fennoscandian Shield Border Zone in south Sweden

  FFC-1 DGE-1a Gravberg-1b Bh32012 in Lake Vätternc Outokumpu R-2500d Hunt well, Western Canadae
Depth, m 3133 3702 6957 1820 2516 2363
Temperature, °C 84 85 116 37 40 47
Q, mW/m2 51–66f 58f 50 35–47 40–45 51
Gradient, °C/km 7–24 22–24 14–18 15–20 14–17 20
K, W/(m K) 2.4–3.6 2.5–3.6 3.4 1.8–2.8 2.5–3.3 2.5
A, μW/m3 3.0f 5.8f 2.0–5.0 0.1f 1.6–5.4 2.9–3.4
Dominating rock types Gneiss, amphibolite Gneiss, amphibolite Granite Diorite Metasediments Pegmatitic granite, ultramafic rocks Gneiss, granite, mylonite
  1. The table is partly based on information in Rosberg and Erlström (2019)
  2. aRosberg and Erlström (2019)
  3. bAldahan et al. (1991)
  4. cSundberg et al. (2016)
  5. dKukkonen et al. (2011)
  6. eMajorovicz et al. (2014)
  7. fWeighted average