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The AAPG/Datapages Combined Publications Database

Williston Basin Symposium

Abstract

MTGS-AAPG

Seventh International Williston Basin Symposium, July 23, 1995 (SP12)

Pages 47 - 56

Compressional and Shear Wave Seismic Studies in the Williston Basin of Central Saskatchewan

Bradley J. Carr, University of Saskatchewan, Department of Geological Sciences, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2 Canada
Zoltan Hajnal, University of Saskatchewan, Department of Geological Sciences, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2 Canada

ABSTRACT

During the spring and fall of 1993, the University of Saskatchewan collected high resolution multicomponent seismic data southeast of Saskatoon, Saskatchewan. The study was conducted to determine parameters necessary to improve horizontal and vertical resolution in traditional seismic data, and to investigate shear wave behavior in this region of the Williston Basin. The study targeted the Prairie evaporite and surrounding lithologies because potash is mined within this formation. The study accomplished its goal by a specially designed survey procedure which increased propagation signal frequencies beyond 100 Hz at depths below 3300 ft (1000 m). This broader signal spectrum significantly enhanced resolution as seen in images of a Winnipegosis mound edge and the margin of the Colonsay collapse. This study also demonstrates that shear waves can be induced and propagated to significant depth despite 320 ft (100 m) of near-surface glacial cover. These transverse waves provide additional information to constrain reflections from various lithologic types, and the ability to identify fractured intervals in the sequence. By combining the P- and S-wave information, a more detailed seismolithologic model is derived.

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