We use high quality borehole logging instruments to capture structural and mechanical data for the geotechnical and resource industries across Australia.


Borehole Imaging and Geophysics 

We operate a variety of downhole imaging and geophysical tools, including Optical and Acoustic Televiewers, Natural Gamma and Full Waveform Sonic. Terrascan is also able to produce interpretation reports of the data collected.

Optical and Acoustic Televiewers

Terratest has access to the latest generation of orientated downhole imaging and data probes including the Acoustic and Optical Televiewers.

Borehole imaging can be used either in conjunction with or as an alternative to core logging, as collecting a continuous high quality sample can be difficult. By utilising a televiewer, clay seams, voids, fractures and unit boundaries can be correctly orientated and depth recorded.  

Projects including the WestConnex M4 and M5, Sydney Metro and Southlink, have seen the value in orientated borehole imaging. Not the mention the numerous mining and resource applications.

FWS (Full Waveform Sonic)

The FWS tool (full waveform sonic) is popular in the water, mining and geotechnical industries. often used in combination with other logs (acoustic and optical) to provide mechanical properties of the borehole wall. with the correct borehole conditions, P and S waves can be detected and velocities calculated.

The FWS tool can only be operated in a fluid filled borehole (similar to the Acoustic tool) as the energy source does not travel well through air.

Natural Gamma

The natural gamma tool measures the naturally occurring gamma radiation in the broehole. They are versatile as they can be used in fluid filled or dry boreholes and can be attached to another tool if desired. Both cased and open holes are suitable for this tool.

Dual Compensated Density 

The Density tool measures density in g/cc of the borehole wall. Often used in Geophysics, Petrophysics, sedimentology and geotechnical investigations. Density is measured using a radioactive source (usually Cs or Co) to emit gamma radiation into the borehole wall and measure the scattered returns using recievers at different spacing's (long and short spaced).

Measurements features: 

- Caliper - borehole diameter in cm or inches

- RHOLSD - Long spaced density in g/cc

- RHOSSD- Short Spaced density in g/cc

- RHOB - Compensated density in g/cc

About Terrascan

Terrascan is a sister company of Terratest, a large geotechnical and environmental drilling company with over 50 years in the industry. With the addition of borehole imaging equipment Terrascan was created to fulfill a more technical role, expanding to include UAV services (Terratest Aero) and slope stability instrumentation.

Our close connection to Terratest makes Terrascan a seamless and more cost effective solution.


Our Clients


Contact Us

Brisbane  |  Newcastle  |  Sydney  |  Melbourne



Tel: 1300 884 198

37 Day Street N

Silverwater, NSW 2128

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