In-situ Structural, Resource and Geotechnical Analysis
Acoustic and Optical Televiewers provide a unique opportunity to visualize, orient and measure borehole features in-situ. Precision depth, dip and dip direction are accomplished with integrated tilt-meters and 3-component magnetometers, providing “true” feature orientation. The resulting data yields an accurate 3D representation for geotechnical, structural and/or resource applications. Acquiring this information throughout a drilling program presents real-time information gain and savings for structural and resource geologists, project managers, geophysicists and/or geotechnical and mining engineers. Acoustic and Optical Televiewers are a cost-effective and reliable alternative to oriented core, especially when core recovery is an issue.
Acoustic and Optical Televiewers are a cost-effective and reliable alternative to traditional oriented core, especially when core recovery is an issue. Televiewers are chosen for:
- Defining in-situ dip, dip-direction and aperture of fractures, veins, bedding and contacts
- Obtaining critical information from areas with missing core or low core recovery (low RQD)
- Detailing fracture and fault zones regarding depth, size, frequency and attitude
- Depicting the in-situ stress field orientation
- Bore deviation (directional) measurement and high-resolution diameter (Caliper)
The Optical Televiewer acquires a 360° high-resolution digital image of the borehole wall using a CCD camera located above a conical mirror. This oriented and seamless image can be viewed “unwrapped” and in a 3-D “virtual core” for the entire borehole. Optimal for the identification of veins, lithological changes, bedding and fractures.
The Acoustic Televiewer (ATV) continuously images the borehole wall with acoustic waves enabling quantified measurement of open borehole features. Fractures, breakouts and other acoustically visible features can be precisely measured in terms of position, depth, aperture, length and orientation (Figure 2, 3 and 4).
ATV Virtual Core and Unwrapped View
Acoustic Televiewer (ATV) results measure the depth of features as well as aperture, length, strike, and dip.
3D Borehole View
Oriented ATV data can be also be displayed in borehole view rotating in three-dimension (3D).
Breakout analysis uses unwrapped cross-sections for maximum visualization, measurement and analysis capability.
OTV and ATV data can be identified, classified and analyzed with “true” orientation.
The Knowledge Gain from Televiewers
Employing OTV or ATV probes independently results in exceptionally accurate data; combining both in a complementary fashion provides an unparalleled in-situ solution. This high-resolution data set is a common information base for multiple and diverse applications that can be leveraged throughout the project lifecycle (Figure 5).