The Solution for Oriented Digital Core
Acoustic and Optical Televiewers (ATV and OTV) provides a unique opportunity to visualize, orient and measure borehole features in-situ while under naturally occurring pressure, temperature and stress conditions. Using the best in class technology and our experienced data processing team, DGI offers the ultimate solution in oriented core.
In-situ Structural, Resource and Geotechnical Analysis
OTV Unwrapped View and Virtual Core
Optical Televiewer (OTV) results clearly showing bedding, geology fabric and open fractures that are oriented and measureable.
Precision depth, azimuth and dip control are accomplished with integrated tilt-meters and 3-component magnetometers; providing attitude reference which enables borehole and “true” feature orientation. Acquiring this information throughout a drilling program presents a significant opportunity for real-time information gain and efficiency for structural and resource geologists, project managers, geophysicists, geotechnical and mining engineers. Furthermore, with digital core, expertise can be offered at a distance.
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 (OTV) acquires a 360° high-resolution digital image of the borehole wall. This oriented and seamless image can be viewed “unwrapped” and in a 3-D “virtual core” for the entire borehole (Figure 1).
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).