BOREHOLE IMAGING: ACOUSTIC SCANNER APPLICATION: The acoustic scanner is an ultrasonic borehole imaging probe which is commonly run in combination with an optical scanner for detailed, high resolution images of the borehole through 360°. Ideal and commonly used for...
NATURAL (TOTAL) GAMMA LOGGING – INROD LOGGING AND REGIONAL CORRELATION. INROD LOGGING AND REGIONAL CORRELATION - PROJECT: Many mature mining provinces have a record of natural gamma logs from boreholes which have been used to establish a regional stratigraphy. One...
Borehole Imaging: Acoustic Scanner (Televiewers) versus 3 or 4 arm dipmeter. 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 It would be fair to say that the acoustic scanner has superseded the 3 or 4 arm...
Deconvolution of gamma logs 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...
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...
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...
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 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...
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...
Full image coverage of a borehole wall – the acoustic scanner probe. The acoustic scanner, also known as the acoustic televiewer, uses high frequency sound wave echoes together with magnetometers and accelerometers to provide an orientated travel time and amplitude...