QL40ABI FOLDER

The Borehole Televiewer (BHTV) tool is an ultrasonic imaging tool. Borehole sidewall images are created by measuring variations in travel times and relative amplitudes of reflected acoustic pulses as the BHTV device moves up the borehole. A water column or a thinned slurry is required to act as medium to transit and recive acoustic signals to and from the borehole wall. The borehole image are presented as unwrapped 2-D false color plots that are oriented to magnetic north. Planar features such as fractures and bedding are show as sinusoidal traces acros each plot.