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Borehole Methods Geophysical borehole logging techniques measure the physical properties of the surrounding medium with a sensor located in a borehole. Some of the common objectives of geophysical well logging are:
Geophysical logs provide continuous records of the properties of soils and rocks, their contained fluids, and well construction. Some borehole geophysical tools sample or investigate a volume of rock many times larger than core or cuttings that may have been extracted from the borehole. Some probes record data from rock beyond that disturbed by the drilling process. Other probes measure various chemical and physical characteristics of materials and fluids in and around a borehole. Many techniques used in surface geophysics are related closely to techniques in borehole geophysics, and the two are often considered together when setting up comprehensive groundwater, environmental, or engineering investigations. The determination of which type of tool used depends upon the conditions of the borehole and the information sought. Some of the more common borehole logging techniques used in groundwater hydrology are:
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