well logging

the process or technique of recording a well log.
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Encyclopedia Britannica

well logging

field technique used in mineral exploration to analyze the geologic formations penetrated by a drill hole. If the hole has been drilled by using coring techniques, the core provides a visual record of the formations and rock types encountered. The description (log) of the core provides the basic data used in geologic analysis, interpretation, and resource calculations.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Well logging is a relatively inexpensive method of collecting subsurface hydrogeologic data that might otherwise be unknown.
Well logging is a process used to determine whether a well drilled deep into the ground has the potential to produce oil.
Solution to a nuclear well logging prob lem for a water-filled borehole, using our new method for eliminating ray effects.
Well logging uses sensors lowered into the well bore that measure vertical changes in various properties of the sediment column.
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