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Borehole Imaging – Optical Scanner – Overview

Borehole Imaging - Optical Scanner - Overview.   Application: The optical scanner is a high resolution CMOS camera borehole imaging probe which is commonly run in combination with an acoustic scanner for detailed, high resolution images of the borehole through 360°. Ideal and commonly used for structural studies and geotechnical investigations but has applications in casing inspection and insitu stress analysis. Method: The optical scanner is a borehole imaging probe which is capable of a high resolution, true colour image thus creating an image of the full 360 degree borehole wall. The...

Dual Laterolog (Focused Resistivity) Logging – Overview

Dual Laterolog (Focused Resistivity) Logging Overview.   Application: Resistivity logging involves the measurement of electrical properties of the rock. Changes in the rock’s electrical properties can be due to the clay mineral content, water content and porosity, temperature and water conductivity. Method: Resistivity logging probes involves the injection of electrical current through a current electrode and measurement of the voltage drop at a potential electrode after passage through the rock. The dual focussed laterolog is an electrical probe with a short and long electrode...

Dual Induction-Conductivity Logging – Environmental Contamination

Dual Induction-Conductivity Logging - Environmental Contamination Project: Rehabilitation of old industrial land is common place today for future land re-use. Shallow drilling and geophysical borehole logging is common practise to map the location of subsurface contaminants from the old industrial sites. This project in an urban setting involved the logging of 40 shallow boreholes. Aim: Induction-conductivity logging was used to map potential contaminants throughout the project area. Common industrial contaminants can have distinctive resistive and/or conductive signature. Operations: The...

Dual Induction-Conductivity Logging – Overview

Dual Induction-Conductivity Logging - Overview   Application: Induction-conductivity logging involves the measurement of induced electromagnetic fields in the rock and resulting eddy currents. Changes in the rock’s electrical properties can be due to the clay...