Detection of Permeable Fracture Zones by Tube Waves in the KTB pilot Hole

C. Hanitzsch, T. Rühl & B. B. Heinemann
The detection of permeable fractures is one of the research objectives of the KTB-project. Among seismic methods the tube wave survey is suggested for this purpose. Open permeable fractures intersecting the borehole may generate secondary tube waves which show up as V-shaped traveltime patterns (Chevron pattern) in sonograms. We investigated tube waves transmitted and recorded by the VAL-(Variable Acoustic Logging)-tool technique. The depths of tube wave generation were determined. 85 percent of them correlate with...
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