Estimation of geothermal gradients from single temperature log-field cases

I. M. Kutasov, L. V. Eppelbaum

Research output: Contribution to journalArticlepeer-review

Abstract

A geothermal gradient is one of the most frequently used parameters in logging geophysics. However, the drilling process greatly disturbs the temperature of the formations around the wellbore. For this reason, in order to determine with the required accuracy the formation temperatures and geothermal gradients, a certain length of shut-in time is required. It was shown earlier (Kutasov 1968 Freiberger Forshungshefte C 238 55-61, 1987 Geothermics 16 467-72) that at least two transient temperature surveys are needed to determine the geothermal gradient with adequate accuracy. However, in many cases only one temperature log is conducted in a shut-in borehole. For these cases, we propose an approximate method for the estimation of the geothermal gradient. The utilization of this method is demonstrated on four field examples.

Original languageEnglish
Pages (from-to)131-135
Number of pages5
JournalJournal of Geophysics and Engineering
Volume6
Issue number2
DOIs
StatePublished - 2009

Keywords

  • Borehole
  • Geothermal gradient

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