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Geophysical Studies
 
Borehole Logging
 
Geophysical borehole logging or well logging, also known as borehole geophysics, involves insitu measurements within a borehole or well to determine the physical property characteristics of the geological formations immediately surrounding the borehole wall and the salinity of interstitial pore fluid. The aim of logging is to obtain precise depth-wise aquifer and confining aquitard information which may not be obtained in general through surface geophysical methods and to refine the lithological information obtained from drilling.
In the pilot study for aquifer mapping, geophysical logging of boreholes is carried out. Here the main objective is to validate the surface and heliborne geophysical data, as well as to precisely delineate the potential aquifers. Electrical, natural gamma radioactivity, temperature-fluid conductivity and caliper probes are used.
 
Schematic view of borehole logging
Source: P. Chandra, J. Roux
 
Example of geophysical logs.
Source: CGWB