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Oilfield Glossary
Oilfield Glossary
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guard log

1. n. [Formation Evaluation]
A measurement made by a type of electrode device in which the current flow and hence the measurement is focused in a disk that is concentric with and perpendicular to the sonde. The term usually refers to a Laterolog-3 device. Guard logs may be recorded by either wireline or measurements-while-drilling tools.