Suppression of free-surface effects from multicomponent sea-floor data

Dmitri Lokshtanov

We use multicomponent sea-floor data to suppress receiver-side ghosts and freesurface multiples and to datum the results of ghosts and multiple suppression from the sea-floor to the free-surface. Both steps - deghosting and multiple suppression - are applied trace by trace to the tau-p transformed common receiver gathers. Datuming for 2D structures with inline lateral variations is performed in the same tau-p domain. Therefore effective suppression of aliasing in the tau-p transform is of crucial importance. In addition to the dip filter our antialiasing protection is based on simple scaling of the results of the transform for high frequencies. The synthetic and real data examples illustrate that the total scheme performs well and is computationally efficient.