Ion Geophysical Corporation

Phillip Roberts

Timothy A Dudley

Curt E Schneider

John Grant

Joseph R Gagliardi

Shawn Rice

Robert Fischer

Noel Zinn

Kevin Simpson

Curt Schneider

In seismic survey for icy waters, streamers are towed behind a vessel under the water's surface to avoid ice. GPS readings may not be consistently obtained because the ice prevents a tail buoy with a GPS receiver from trailing from streamer at the surface. Instead, a device tows on the streamer under the water's surface. The streamer's absolute position is tracked by intermittently bringing the towed device toward the surface so GPS readings can be obtained. The streamer's absolute position can then be used in conjunction with compass readings and can correlate various seismic sensor signals obtained along the streamer during the survey. The compass readings can be corrected for declination using declinometer readings, which can be compensated for iron effects from the vessel or other device carrying the declinometer.

Declination compensation for seismic survey

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Katy, TX, United States of America

Phillip Roberts