Method of imaging a sea-surface reflector from towed dual-sensor streamer data

摘要

#$%^&*AU2009212893B220151119.pdf#####ABSTRACT OF THE DISCLOSURE [0074] A pressure wavefield and a normal velocity wavefield measured on a smoothly shaped acquisition surface by towed dual-sensor marine seismic streamers are decomposed into up-going and down-going pressure and particle velocity components on an observation level between the acquisition surface and a sea surface of undetermined shape. The up-going and down-going pressure and particle velocity components are extrapolated iteratively in steps from the observation level toward the sea surface. An image point and a reflection coefficient of the sea surface at the image point are determined from the iteratively extrapolated up-going and down-going pressure and particle velocity components.2/5 Decompose pressure wavefield and normal velocity wavefield measured on smoothly shaped acquisition surface by towed dual-sensor marine seismic streamers into up-going and down- _20 going pressure and vertical velocity components on observation level between acquisition surface and sea surface of undetermined shape Extrapolate up-going and down-going pressure and vertical velocity components iteratively in 21 steps from observation level toward sea surface Determine image point and reflection coefficient of sea surface at image point from U- 22 iteratively extrapolated up-going and down-going pressure and vertical velocity components FIG. 2