Glossary of Geophysical Terms
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WXYZ
O
Ohm (Ώ)
The unit of electrical resistance through which 1 amp of current will flow when the potential difference is 1 V.
Ohm-meter (Ώm)
Unit of electrical resistivity; the resistivity of 1 m3 of material, which has a resistance of 1 ohm when electrical current flows between opposite faces; the standard unit of measurement for resistivity logs.
Open hole
Uncased intervals of a drill hole.
Optimum offset
Seismic reflection technique employing optimum window.
