1. n. [Formation Evaluation]

An interval of log that has been recorded for a second time. The repeat section is typically 200 ft [60 m] long. The purpose is to judge the repeatability of the measurement by recording it twice over the same interval with the same recording parameters. Strictly speaking, the repeatability can be judged properly only if the depth measurement is the same on both runs, if the tool takes the same path in the borehole and if there have been no changes in the borehole or formation. In practice, the repeat section gives a good overall picture of the repeatability of the log. There can be more than one repeat section.

See related terms: accuracy,  precision,  reproducibility,  uncertainty