<h4>Borehole Imaging: Acoustic Scanner (Televiewers) versus 3 or 4 arm dipmeter.</h4> The acoustic scanner and 3 or 4 arm dipmeter probes have been used for coal exploration for a long time. It would be fair to say that the acoustic scanner has superseded the 3 or 4 arm dipmeter as being the preferred method for […]
Borehole Geophysics in Universities – Do we need more?
<h4>Borehole Geophysics in Universities</h4> Should more attention be given to borehole geophysics in undergraduate geology and/or geophysics courses? <h4>Borehole Geophysics</h4> Borehole Geophysics (also known as geophysical logging, downhole logging, wireline logging or well logging) is an increasingly common technique employed in today’s mining, exploration, geotechnical, groundwater and environmental markets. The need for in situ data […]
Managed Aquifer Recharge Schemes (MAR)
<h4>Managed Aquifer Recharge Schemes</h4> An interesting presentation at a recent groundwater forum showed the increasing popularity (in the arid conditions of South Australia – a necessity) of Managed Aquifer Recharge schemes. <h4>What is MAR?</h4> One definition of a managed aquifer recharge scheme is the ability to store treated and recycled water in a subsurface aquifer. […]
Deconvolution of gamma logs
<h4>Deconvolution of gamma logs </h4> Deconvolution is a common process in seismic process where the objective is to “sharpen” the seismic response at depth. The process is necessary as the earth through which the seismic source pulse travels is altered by the rocks which act as a filter to broaden the seismic response at depth. […]
Water Well Integrity & Compliance Testing using the Fullwave Sonic Geophysical Logging Method
The need for integrity and compliance testing of local water wells has been highlighted in a recent groundwater forums to halt the loss of a valuable resource whether through age of the well or poor installation procedures. <h4>What is the problem?</h4> Any borehole drilled in the ground has the potential to connect two or more […]
Geophysical logging for soil moisture
<h4>Soil Moisture and Contaminant Plumes</h4> An interesting presentation at a recent groundwater forum emphasised the importance of soil moisture in the distribution of contaminant vapour plumes particularly TCE. <h4>Relevance to Adelaide today</h4> This is of particular importance in Adelaide where numerous contaminated sites are being identified within or close to old industrial complexes. <h4>Transport of […]
Caliper logging of boreholes
<h4>Caliper logging</h4> The caliper probe, a simple mechanical device, whose main functionality is to measure the internal diameter of a borehole or casing string within a borehole. Another purpose of a caliper arm is to push a section of a probe against the side of the borehole (for example density logging), known as sidewalling. […]
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 converted to light energy enabling digital count rate conversion. The most common crystal used […]
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 establish under specified conditions, the relationships between values indicated by the measuring instrument and corresponding values […]
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 in unstable ground which requires geophysical logging off a rig, failure of a geophysical logging […]
