Abstract：Acoustic borehole televiewer (BHTV) logging is the first geophysical approach to obtain the intuitionistic image of borehole wall. New generation BHTV is characterized with high accuracy，resolution and high logging velocity for the advanced technology of focused ultrasound beam and digital recording and digital data process are adopted. It is one of the most direct and effective methods to detect fracture in boreholes. The main advantages of the BHTV are of high resolution and full 360-degree coverage of the borehole circumference from which the character，relation，and orientation of structural planar features can be defined. Simple introduction of the acoustic imaging method is presented，and its application and integrated studies on pre-siting and site characterization for deep geological disposal of high-level radioactive waste are described. The borehole images，three magnetometer coordinates，and two inclinometer coordinates of each point of borehole wall are obtained by using BHTV. Based on this borehole information，location，size and orientation of fractures that intersect the borehole are determined. The calculation of borehole deviation is performed；and the rock cores taken from borehole are oriented in the laboratory. The extension of joints/fractures and faults surrounding the borehole is assessed. Therefore，it is considered that BHTV is a useful tool to detect the joints and fractures in the deep geological formation. But as a geophysical approach，limitations of this tool in practice should be considered.
