Understanding Geophysical Borehole Logging (Well Logging)
What geophysical borehole logging is, the common log types, and its applications for groundwater, geotechnics, and exploration.
What is borehole logging?
Geophysical borehole logging measures the physical properties of formations along a borehole using a probe lowered into the well. The results complement surface data with detailed vertical information on lithology, porosity, water content, and formation quality.
Common log types
Commonly used logs include gamma ray (distinguishing clay/sand), resistivity (water-saturated zones), spontaneous potential, caliper (hole diameter), and sonic/PS logs for wave velocity. Combining several logs yields a more complete formation interpretation.
Applications
Logging is used to evaluate groundwater wells (confirming aquifers & placing screens), geotechnical characterization (Vs/Vp profiles via PS logging for Vs30), and mineral and coal exploration.
Available instruments
Jatific supplies OYO logging systems: the Geologger-GWS with combination probes for standard well logs, and the McSEIS-PS for suspension PS logging (accurate Vs/Vp profiles). Winches and supporting accessories are also available.
Need an instrument or advice?
The Jatific team is ready to recommend the right tool for your survey.
Request a Quote