Subsurface temperature and heat flow
Compare bottom-hole temperatures with depth and see measured heat flow near wells: context for geothermal reuse.
- Norwegian wells with bottom-hole temperature and TVD
- 1,344
- Trend in this sample
- 32.5 °C/km
- IHFC heat-flow measurement sites
- 71,934
Reusing former oil and gas wells for geothermal energy requires site studies of temperature, flow, well integrity and permits. This page offers source-linked context for initial screening only.
Bottom-hole temperature and depth
UK NSTA maximum-hole temperatures are not used here: in this snapshot their subsea depth field mixes positive and negative values without a documented sign convention.
Temperature in 500 m depth bins
| Depth range (m) | Wells | Median | Interquartile range |
|---|---|---|---|
| 500–1,000 | 24 | 27.0 °C | 24.0–29.5 °C |
| 1,000–1,500 | 17 | 39.0 °C | 36.0–46.0 °C |
| 1,500–2,000 | 111 | 69.0 °C | 57.0–77.0 °C |
| 2,000–2,500 | 190 | 79.5 °C | 71.3–87.0 °C |
| 2,500–3,000 | 248 | 97.0 °C | 87.0–106.0 °C |
| 3,000–3,500 | 233 | 116.0 °C | 105.0–124.0 °C |
| 3,500–4,000 | 201 | 129.0 °C | 121.0–140.0 °C |
| 4,000–4,500 | 154 | 148.0 °C | 138.0–156.0 °C |
| 4,500–5,000 | 111 | 163.0 °C | 153.0–169.0 °C |
| 5,000–5,500 | 47 | 178.0 °C | 161.0–183.5 °C |
| 5,500–6,000 | 8 | 195.5 °C | 186.5–198.3 °C |
Highest reported bottom-hole temperatures
| Name | Bottom-hole temperature | True vertical depth (RKB) | Recorded spud date | Source purpose |
|---|---|---|---|---|
| 6506/9-1 | 205 °C | 5,660 m | 2009 | Appraisal |
| 6608/2-1 S | 202 °C | 5,600 m | 2013 | Exploration |
| 6506/6-1 | 200 °C | 5,474 m | 2000 | Exploration |
| 2/4-18 R | 199 °C | 5,305 m | 1994 | Exploration |
| 2/4-20 | 197 °C | 5,673 m | 2007 | Exploration |
| 1/5-5 | 197 °C | 5,940 m | 2016 | Exploration |
| 6406/2-1 R | 194 °C | 5,790 m | 1995 | Exploration |
| 1/6-6 | 190 °C | 5,562 m | 1992 | Exploration |
| 6406/2-5 | 190 °C | 5,438 m | 1997 | Appraisal |
| 6603/5-1 S | 190 °C | 5,068 m | 2010 | Exploration |
| 2/4-23 S | 190 °C | 5,448 m | 2015 | Exploration |
| 6506/12-10 A | 189 °C | 5,361 m | 1995 | Appraisal |
Heat-flow coverage near atlas wells
Nearest IHFC measurement site for wells in each catalogue. Distance does not mean the measurement represents the well location.
| Catalogue | Wells | within 10 km | within 25 km | within 50 km | Median nearest distance | Median heat flow of nearest sites |
|---|---|---|---|---|---|---|
| CalGEM — California public geothermal wells | 2,895 | 84% | 92% | 100% | 1.52 km | 203.0 mW/m² |
| BC Energy Regulator — Public well surface holes | 28,928 | 28% | 80% | 99% | 13.6 km | 63.0 mW/m² |
| Index of Oil and Gas Wells in Israel | 609 | 84% | 95% | 99% | 466 m | 47.0 mW/m² |
| UFZ — Jordan Water Wells | 6,729 | 11% | 54% | 93% | 22.0 km | 62.0 mW/m² |
| TNO / NLOG — Netherlands boreholes | 5,758 | 85% | 97% | 100% | 2.63 km | 76.0 mW/m² |
| NZ Petroleum & Minerals — Public petroleum wells | 1,210 | 77% | 90% | 97% | 2.72 km | 62.7 mW/m² |
| Norwegian Offshore Directorate — Wellbores | 9,781 | 6% | 14% | 31% | 26.5 km | 58.5 mW/m² |
| NSTA — UK offshore wellbore top holes | 13,383 | 23% | 41% | 50% | 10.7 km | 63.0 mW/m² |
| NSTA — England onshore wellbore top holes | 2,138 | 46% | 91% | 99% | 10.9 km | 65.0 mW/m² |
Quality codes are verbatim: U1–U4 uncertainty class (U1 best, Ux not computable), M1–M4 methodological class (x suffix: incomplete metadata); trailing letters are perturbation flags.
Nearby wells and heat flow
Your location is never read automatically; only the coordinates you enter are sent to the server.
Sources, rights and method
U.S. EIA · Europe Brent Spot Price FOB, annual ↗
Source accessed: 2026-10-04
Reuse terms: EIA public information; the underlying daily prices come from a third party
Commercial permission unconfirmed
EIA computes annual values as unweighted averages of daily closing spot prices supplied by Refinitiv, an LSEG business. EIA information is public, but its reuse policy excludes content licensed from third parties; redistribution rights for the underlying daily prices are not established here, so only the published annual averages are shown.
Source: U.S. Energy Information Administration (Sep 2026). Underlying daily prices: Refinitiv, an LSEG business.
0f13cb979e17d29b4fa038891a57ff2babcbc1caa2c44ff39622020f426553d5
IHFC · Global Heat Flow Database, Release 2024 (v. 2026.03) ↗
Source accessed: 2026-10-04
Reuse terms: CC BY 4.0
Global Heat Flow Data Assessment Group et al. (2024): The Global Heat Flow Database: Release 2024. V. 2026.03. GFZ Data Services. https://doi.org/10.5880/fidgeo.2024.014 Licensed under CC BY 4.0. Wellficent shows parent-level site values and selected metadata; values are not modified.
3442369abbbe3d904fc99e7acaf6cf002b94d10ee1257ee95d21b630919386d9
Derived values
- Spud-year counts use each registry record with a source spud date; records without one are excluded and counted separately. The year containing a catalogue snapshot date is partial; later years are not covered.
- Measured-depth quantiles are per catalogue and spud year, linear interpolation (type 7), on the first reported measured depth in metres with its source reference level unchanged.
- Production lifecycle values use SODIR net oil equivalents in million Sm3. Rolling 12-month sums require 12 consecutive unflagged months; cumulative sums exclude flagged months. Periods incomplete at source access are excluded.
- Produced water share = produced water / (produced water + gross oil) over the latest valid 12-month window, standard volumes; shown only when gross oil is positive.
- Bottom-hole temperatures are SODIR-reported values at true vertical depth below RKB; correction method is not stated. Log temperatures can underestimate formation temperature.
- Heat-flow values are IHFC parent-level site values in mW/m2 with verbatim quality scores. Distance to a heat-flow site is context, not a measurement at a well.
- Brent values are EIA annual averages in nominal USD per barrel. Correlations with drilling counts are descriptive and do not establish causation or forecast skill.
Analysis edition: f702bc104e8a256dab42acd3abc2ec571688c35dbf8406cc7f387377f9bb9004