geophysical log

geophysical log
a graphic record of the measured or computed physical characteristics of the rock section encountered in a borehole, plotted as a continuous function of depth. Measurements are made by a sonde which contains the detectors, as it is withdrawn from the borehole by a wire line. Several measurements are usually made simultaneously, and the resulting curves are displayed side by side on the common depth scale. A common suite of logs used in coal exploration include caliper, density (gammagamma), natural gamma, and resistivity.
- density log - natural gamma-ray log - resistivity log

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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