Oilfield Glossary
Oilfield Glossary
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guard electrode

1. n. [Formation Evaluation]
An electrode on a laterolog sonde that focuses the current sent by the central current-emitting electrode (A0). The guard electrode is held at the same potential as A0, thereby forcing the current from A0 to run approximately perpendicular to the sonde into the formation, and preventing it from running up the borehole to a great extent.