Blogs from all our categories
Gamma logging techniques for Uranium
Gamma logging for uranium exploration and mining is an established technique for producing a rapid and cost effective depth based profile in a borehole of uranium ore grade. The most common measurement systems involve a scintillation system where gamma photons are...
Calibration, Normalisation, Verification
Probe calibration, normalisation and verification – what is the difference? Calibrated data, this is often stipulated by a client in a contract but the calibration is commonly misunderstood. Calibration A definition of calibration is: A set of operations which...
Expectations of Your Geophysical Logging Contractor
A geophysical logging contractor is a small part of an exploration or mining development team. The team would likely include a drilling contractor(s), rig geologists, staff geologists, fieldies, logistics, and camp logistics. But if you are drilling deep boreholes or...
Borehole Presentation – Deep Exploration Technologies CRC
I attended a presentation by DET CRC at the Australian Society of Exploration Geophysicists concerning the principles of the project and a current status. The talk outlined the guiding principles of the program: The need to drill more boreholes in areas covered by...
Downhole Geophysical Workshop – ASEG 2015
The Australian Society of Exploration Geophysicists event was held at the Perth Convention Centre on the Saturday before the main conference. There were over 40 attendees who were treated to a range of presentations from major geophysical logging contractors in WA...
Fullwave Sonic Logging
The fullwave sonic probe measures sonic waves (via pressure pulses) between a transmitter and a series of receivers – all at fixed distances in the probe. Velocity or transit time of the sound wave is a very useful parameter for engineering parameters such as rock...
Borehole Imaging
Borehole imaging probes are now a common service provided in boreholes drilled for mineral exploration, geotechnical investigations and groundwater programs. The major mineral borehole imaging methods are: Acoustic imaging: requires a fluid filled borehole Optical...
Borehole Imaging – Optical Scanner
Full image coverage of a borehole wall in true colour – the optical scanner probe The optical scanner uses a high resolution digital camera together with magnetometers and accelerometers to provide an orientated true colour image of the borehole wall. Principal...
Borehole P-S Seismic Suspension Logging
Ever wanted accurate compressional and shear wave arrival times in uncompacted near surface sediments? The borehole P-S seismic suspension logging probe has been designed for this purpose and can provide these measurements from inside PVC casing. By themselves, the...