Borehole Optical Televiewer Probe

The OPTV probe provides a continuous, detailed and orientated 360º image of the borehole walls using a unique optical imaging system. This can be rapidly interpreted, using data from the internal orientation module, to obtain a complete feature analysis that includes dip, strike, frequency and fracture aperture. One popular visual data display option is the projection of features onto an imaginary core that can be rotated and viewed from any orientation. In fact, an OPTV survey can often replace expensive coring with its associated problems of incomplete core recovery and offers much greater flexibility and convenience for data interpretation than a conventional borehole television survey.

A choice of RG-DIP or GMI Imager interpretation software is available for detailed analysis of the displayed features and includes conventional arrow (tadpole) plots, stereograms of feature orientations and synthetic core images.

Download 3 log examples here:

These are large files and if you don't have access to broadband then click here and request our free demonstration disk

Alnwick is a 28 metre section through bedded sandstones of Carboniferous age. The water level is at 52.8 metres. The best features are around and below 60 metres where steeply inclined fractures, cross-bedding and a variety of diagenetic features can be observed.
alnwick borehole (17.6MB)

Deganwy is a 35 metre section recorded in RG's in-house borehole, entirely below the water level. The formation is a series of flows of crudely stratified rhyolitic tuffs of Ordovician age, which have been metamorphosed and tectonised during the Caledonian episodes. The feature of interest, apart from the gross fracturing and jointing, is the injection of a new magmatic phase which has locally brecciated the tuff, and was later the focus for renewed fracturing and mineralisation. This lithological information was not available from any other borehole instrument, and allows good correlation with local outcrops.
Deganwy borehole (14.0MB)

Storrs is a 40 metre section from the USGS test borehole. Bedded sandstones which demonstrate excellent sedimentary features overlie a granitic gneiss. There is an excellent unconformable contact between conglomerates and the deformed gneiss at 64.2 metres. Again, the lithological richness of the image demonstrates the power of this instrument in borehole studies.
Storrs borehole (28.6MB)

Download case study here:

A case study through flagstones in N Scotland by Dr. Andy Siddans:
Download here (5.7MB)