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Table 1 List of wells with reported temperatures above the critical point of water (374.15 °C)

From: Utilizing supercritical geothermal systems: a review of past ventures and ongoing research activities

Country Site (depth) P/T Permeability/fractures References
Italy Sasso-22 (4092 m) 380 °C at 3970 m during stop of drilling Highly fractured down to bottom Bertini et al. (1980)
  San Pompeo 2 (2966 m) >400 °C, >240 bar Fractured in 2930 m, no fractures between 2300 and 2930 m Batini et al. (1983)
  Carboli 11 (3455 m) 427 °C @ 3328 m   Ruggieri and Gianelli (1995) and UNMIG (2010)
  San Vito 1 (3045 m) 419 °C BHT (1 week after end of drilling) Permeability available Baron and Ungemach (1981)
Iceland NJ-11 (2265 m) >380 °C, possibly 220 bar Permeability, low vertical permeability Steingrimsson et al. (1990)
  RN-17 (3082.4 m) 320–380 °C BHT from extrapolated temperature logs and fluid chemistry information Permeability about 300 m above total depth Marks et al. (2010)
  IDDP-1 (2104 m) Wellhead: 450 °C, 140 bar, BHT: molten magma Permeability, production 10–12 kg/s steam Friðleifsson et al. (2014)
  K-36 (2501 m) Possibly superheated conditions at >2 km Permeability available Friðleifsson et al. (2010)
  K-39 (2865 m) Freshly quenched silicic glass, 385.6 °C at 2822 m in drill pipe shortly after end of drilling Feed zone in 100 m distance from intrusion Mortensen et al. (2010)
  IDDP-2 (4659 m) 427 °C, 340 bar, 6 days after end of circulation Permeability indicated Friðleifsson and Elders (2017)
Japan Kakkonda, WD-1a (3729 m) 500 °C No permeability, little fracture density in the ductile part Kato et al. (1998)
US Wilson No 1 (3672 m) 325 °C unequilibrated (30 h after end of circulation), 400 °C from fluid inclusions, high-pressure fluid zone during drilling, 489 bar indicated by mud weight Steam entry at 3631, in sidetrack A2 (3762 m) 3.5 kg/h steam entry at 3762, pressure declining Fournier (1991) and DOGGR online well records (1982)
  Prati-32 (3396 m) 400 °C @ 3352 m Fluid entry at 3352 m, 10.6 kg/s steam at a normalized pressure of 6.9 bar Garcia et al. (2016)
  IID-14 (2073 m) 390 °C, 207 bar at TD Total circulation loss below 2033 m Kaspereit et al. (2016) and DOGGR online well records (1990)
  KS-2 (2440 m) 342 °C and 146 bar @ 1676 m, supercritical conditions extrapolated at TD Permeability below 1965 m; 4 kg/s steam @ 12 bar wellhead pressure during flow testing Iovenitti and D’Olier (1985)
  KS-13 (2488 m) 1050 °C Injectivity above the intrusion Teplow et al. (2009)
  Lanipuna-1 (2557 m) BHT: ≥363 °C 32 h after end of circulation Low permeability, conductive temperature gradient Campbell and Gardner (1981)
Mexico H-8 (2300 m), H-11 (2376 m), H-12 (2984 m), H-26 (2546 m), H-27 (2584 m), H29 (2186 m), H-32 (2186 m) >380 °C estimated, young intrusions at H-12 and H-26 Circulation loss close to bottom, overall low permeability Espinosa-Paredes and Garcia-Gutierrez (2003)
Kenya MW-01 (2198 m) 391 °C Permeable zones identified at 1200–1400, 1600–1750, and 1900–2008 m depth Kipyego et al. (2013)
  MW-04 (2118 m) Fresh quenched glassy cuttings during drilling, 390 °C during flow testing, 140 bar shut-in, 20 bar flowing conditions Low permeability above molten magma; permeability noted between 1700 and 1800 m depth Sekento (2012), Kipyego et al. (2013) and Mbia et al. (2015)
  MW-06 (2172 m) Fresh quenched glassy cuttings, 325 °C Low permeability above molten magma; permeability noted between 1802 and 2002 m depth Kipyego et al. (2013) and Mbia et al. (2015)