Over-Under Deghosting

For streamer acquisition, the reflection of the up-going wave field at the sea surface (or ghost) contaminates the recordings, and in particular, significantly attenuates the lower frequencies. In order to eliminate the ghost, we may choose to advocate the recording of the wave field at several different depths: the so-called ‘Over-Under’ technique. In this paper we demonstrate on real example the value of this technique as well as some theoretical insights.