Televiewer

Televiewer: High-Resolution Borehole Imaging

Televiewer technology is an advanced borehole imaging method that provides high-resolution, continuous images of borehole walls, allowing for detailed analysis of subsurface conditions. GeoPhysi is a leader in Televiewer services, offering clients the ability to visualize and interpret subsurface features with unparalleled clarity.

There are two main types of Televiewers:

• Acoustic Televiewer: Uses ultrasonic pulses to generate a detailed image of the borehole wall, ideal for identifying fractures, bedding planes, and other geological features.
• Optical Televiewer: Captures high-resolution optical images of the borehole wall, providing a clear and detailed view of the subsurface materials.

GeoPhysi’s Televiewer services are essential for applications such as fracture analysis, structural geology, and well integrity assessment. By choosing GeoPhysi, clients gain access to state-of-the-art imaging technology and expert interpretation, ensuring that they have the detailed information needed to make critical project decisions.

Technical reference · Borehole imaging

What a borehole televiewer records

A televiewer produces a depth-referenced image and related measurements of a borehole wall. Optical and acoustic systems can help identify fractures, bedding, foliation, breakouts, vugs and other discontinuities when borehole conditions and data quality are suitable.

The engineering value comes from calibrated depth matching, orientation interpretation and integration with lithology, drilling records and other logs—not from the image alone.

Optical vs acoustic selection and limitations

• Optical televiewer: can provide high-resolution visual texture when the borehole fluid is sufficiently clear and the wall is visible.
• Acoustic televiewer: can be useful where optical visibility is poor and acoustic returns from the borehole wall are interpretable.
• Quality checks: verify depth, orientation, coverage, standoff, signal quality and consistency with drilling and geological records.

Fracture picks, orientation and condition are interpretations with uncertainty. Washouts, rugosity, poor coupling, opaque fluid, tool speed and incomplete coverage can limit confidence. Related methods include suspension PS logging, parallel seismic and the Technical Hub.

Page responsibility: GEOOE Technical Center. Final geological or structural interpretation should be reviewed against the project evidence and the responsible engineer’s requirements.