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Log-header bottom hole temperature (BHT) data are notoriously unreliable. However, due to the general lack of better quality data, BHT data must often be used to constrain the subsurface thermal regime. Dr. Jeff Corrigan analyzed 983 bottom hole temperature (BHT) and associated equilibrium temperatures estimate (Teq) pairs. Based on his analysis, methods for correcting BHT data are recommended using information typically available with BHT data (the BHT measurement, time since circulation, and/or depth).

The recommended BHT correction method depends on the type of information available. A Horner correction is recommended if three of more self-consistent BHTs from a given depth are available. For data in Dr. Corrigan's study, the Teq estimate uncertainty (1 sigma) using the Horner correction is ±14 °F (±8 °C)

Uh-oh. If you can read this, you'r not using a Java-enabled browser	If you do not have circulation time information, enter 0 to obtain the minimum Horner correction. The histogram below shows the differences between DST temperatures and adjacent ±500 ft. Horner-corrected BHTs provides an estimate of the uncertainty associated with a Horner-corrected temperature.

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