Schlumberger

Water Velocity Correction (WVC)

Compensate for varying water temperature and salinity

Changes in water temperature and salinity alter the velocity of the seismic signal travelling through the water layer and hence, the recorded travel times. Water velocity decomposition (WVD), our primary approach to water velocity correction, is a dynamic correction that accounts for changes in sea conditions over time.

Estimates of water velocity, zero-offset time, and water-bottom dips are decomposed from water-bottom reflection times and used to calculate the shifts (delta-t) that are applied to the data. The variable-velocity water layer is thus treated as a water layer with a known velocity function.

Reduce turnaround time with onboard processing

WVD is a proven robust solution to the challenge of water velocity corrections. Improvements to the algorithms and workflows have reduced the overall turnaround time, enabling use of the technique on the acquisition vessel as part of an accelerated onboard deliverable.

The algorithm can handle datasets with multiple datums and differing source and receiver acquisition depths to accommodate contemporary broadband seismic acquisition techniques.

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