Deghosting by joint deconvolution of a migration and a mirror migration

Abstract

This paper focuses on marine receiver deghosting. This step of processing has received renewed interest in recent years because it is a key point in increasing the bandwidth of the final images. Morever, any non‐conventional marine acquisition method, such as over‐under streamers, dual‐sensor streamers or variable‐depth streamers, requires its own receiver deghosting method. I will adress the deghosting problem from a novel viewpoint, which leads to a deghosting method adapted to any acquisition method. This deghosting method is optimal in terms of signal‐to‐noise ratio because it is not performed as a preprocessing stage. It is true amplitude, being able to extract the true deghosted reflectivity, that is the reflectivity that would have been obtained should the water surface be not reflecting. The principle of this method is to perform a migration together with a mirror migration, and to perform a joint deconvolution of these two images. The proposed method is illustrated on a synthetic and a real data example with a variable‐depth streamer acquisition.