A wide variety of measurements can be made in a borehole: acoustic, electrical, radiometric, gravitational and magnetic. There are over 50 types of logs offered commercially.
Almost any property of earth materials can be estimated by use of borehole methods. The proper method is linked to the geologic problem to be solved.
Boreholes must be drilled to the specifications for the technique to be used. Borehole preparation, borehole caliper, tool calibration, and operator training are among the fine points of execution to be addressed for a successful borehole campaign. Results are valid at the borehole; interpretation is required to interpolate between boreholes.
Survey logistics depend on the technique being employed. Deliverables include profiles of the tool’s response vs. depth, along with maps and a narrative discussion of the work performed.