Jargon Busting: Borehole Logging

Borehole logging can be used for a range of purposes including hydrological and groundwater investigations, Environmental monitoring, Assessing coal deposits and more. It is the activity of logging the properties found in the ground using a number of specialised equipment. Our jargon-busting guide will explore and explain some of the terms commonly used in the field.

Log

A log is a record of the various properties found in the rock and soil surrounding the borehole. Logs can measure a range of properties including the size of the borehole, the neutron absorption rate, the acoustic travel-time of the rock and more.

Winches

A winch is a lifting device which is carefully engineered to ensure reliable operation under harsh field conditions. It usually consists of a strong cable, winding round a rotating drum which is then cranked by a motor.

There are a variety of winches available, each offering a range of benefits and applications. For example, Robertson Geologging work with a number of winches, including the Mini Winch which is portable & compact, aiming to be reliable under arduous conditions on a long-term basis. The SMART winch is another option which is a remote controlled system which is battery operated. A number of details will determine which winch is suitable for the job. For example, if you had a heavy probe with a shallow borehole, the 500m Winch would be ideal for you - heavy-duty and vehicle battery operated.

Probe

Often coined Sonde, a probe is used to take measurement of the soils properties. The probe will contain a specific sensor which can supply information on the various properties of rock and soil in the surrounding area. The probe is attached to an insulated electrical cable and lowered into the borehole.

As do winches, probes can also come in a number of sizes. The diameter and length of the probe is dependent on the size of the borehole and also the material that cases it. The temperature and pressure within the borehole also plays a part in the probe choice.

Cable

An insulated electrical cable which lowers the probe down into the borehole. The cable is the main power supply for the probe when in the borehole, it can also be used to measure the depth of the device. You will find the cable attached to the winch which is used to control the lowering of the cable.

We hope that this article has helped you understand some of the terms used in borehole logging. For similar posts, you can find lot’s of useful information on borehole logging here.

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