Ultra-Long Spaced Electrical Log
Ultra-Long Spaced Electrical Log :
(n.) Formation Evaluation. A conventional electrical log with very long electrode spacing. The ultralong-spaced electrical log (ULSEL) is a normal device with a distance between the current-emitting electrode and the measure electrode of between about 75 ft [23 m] and 1000 ft [305 m]. The long spacings are designed to locate objects within tens of feet of the borehole. These objects may be a saltdome or casing, in the case of a relief well. See: Electrode Device, Resistivity Log, Salt Dome
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