a. A widely used geophysical technique that involves probing of the Earth with instruments lowered into boreholes, their readings being recorded at the surface. Among rock properties currently being logged are electrical resistivity, self-potential, gamma-ray generation (both natural and in response to neutron bombardment), density, magnetic susceptibility, and acoustic velocity. Dobrin
b. In deep bores, measurement of resistivity of the formations drilled through. Electrodes are plunged into the drilling mud at controlled spacings. See also: electric log
c. The lowering of sensors into a borehole and recording of physical information as a function of depth. Numerous types of geophysical logs can be recorded, the more common being rate of penetration, temperature, gamma-ray, electric, and caliper (for hole diameter). Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms












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