Glossary of Geophysical Terms
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Bedrock
A general term referring to rock that underlies unconsolidated material.
Borehole-compensated
Probes designed to reduce the extraneous effects of the borehole, casing, and of probe position are called borehole-compensated.
Borehole television or video
A downhole television camera; see acoustic-televiewer definition.
Bottom-hole temperature
The bottom-hole temperature (BHT) usually is measured with maximum recording thermometers attached to a logging probe.
Bouguer correction
The process of correcting gravity data for the mass of the rock between a given station and its reference (base) station. Application of the Bouguer correction to the data set, as well as corrections for latitude, topography, meter drift and elevation, yields the Bouguer anomaly.
Brute stack
A common midpoint stack with only preliminary static corrections (often none) and preliminary normal-moveout corrections (often constant velocity). This stack is often done by field computers to verify the existence of actual reflections.
Bulk density
Bulk density is the mass of material per unit volume; in logging, it is the density, in grams per cubic centimeter, of the rock with pore volume filled with fluid.
Bulk modulus
A modulus of elasticity, relating change in volume to the hydrostatic state of stress. It is the reciprocal of compressibility.
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