Adaptive Deghosting Including the Rough and Time Variant Sea Surface

Abstract

A rough and time-variant sea surface can cause uncertainties of the source and detector locations with respect to the sea surface. Deghosting of pressure data that ignores the rough and time-variant character of the sea surface
will result in noise and ringing. The effect of a rough and time-variant sea surface at the source is different from the detector side. At the source
side an effective rough and time-invariant sea surface is considered, where at the detector side a rough and time-variant sea surface is considered. For both sides a deghosting method is proposed that on-the-fly will optimize the actual detector and/or source locations. The method uses wavefield propagation to take into account a rough and timevariant sea surface. In order to account for the time-variant effects the method is applied for specific windows of the data. An extreme case with a rough and time-invariant sea surface will show that the adaptive source deghosting method is able to improve the SNR after deghosting compared to a non-adaptive deghosting method. The next extreme case will show that at the detector side the window-based adaptive deghosting method will further improve the perfomance in the case of a time-variant surface.