Page 404 - Acquisition and Processing of Marine Seismic Data

7.7 SURFACE-RELATED MULTIPLE ELIMINATION 395

FIG. 7.29 Application of f-k filtering for multiple elimination. (A) NMO corrected CDP gather with 1500 m/s multiple
reflection velocity, which flattens the multiples (M) and overcorrects the primary reflections. (B) The same CDP after muting
out the narrow vertical zone in the f-k domain. Corresponding f-k spectra of the CDP gathers are given in the bottom panels.

the seafloor or subsurface sediments, and then completely predicted from the data itself, which
being recorded at the receivers. SRME is one is accomplished by 2D autoconvolutions of the
of the most effective multiple elimination input data in time and space directions
methods today in the seismic industry, and it (Verschuur et al., 1992). In order to remove the
can deal with any kind of surface-related multi- multiples from one single shot by the SRME
ples, such as long period and peg-leg multiples, method, all other shot records in the line are also
or multiple energy at near offset traces, as well as required.
the multiples of very little differential moveout. In the application, only reflection coefficient
The key advantage of SRME is that it is entirely of the sea surface (generally assumed to be 1
data driven and needs no subsurface or any for marine seismic surveys) and the recorded
other extra information, since the multiples are seismic data is required to define a surface