Peg‐leg and free surface multiple removal, a key to imaging subsalt reflectors

Merger, William M.; Marek, Larry T.; Heinze, William

doi:10.1190/1.1826413

SEG Technical Program Expanded Abstracts 1996 1996

DOI: 10.1190/1.1826413

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Peg‐leg and free surface multiple removal, a key to imaging subsalt reflectors

William M. Merger¹,

Larry T. Marek²,

William Heinze³

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1999

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Combining two seismic experiments to attenuate free‐surface multiples in OBC data*

Ikelle

1999

Geophysical Prospecting

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The current inverse scattering solution used for multiple attenuation of marine seismic reflection data assumes that sources and receivers are located in the water. To adapt this solution to the ocean-bottom cable (OBC) experiment where receivers are located on the sea-floor, we have proposed combining the conventional marine surface seismic reflection data (streamer data) with OBC data. The streamer data add to the OBC data some of the wave paths needed for multiple attenuation. This combination has allowed us to develop a multiple attenuation method for OBC data which does not require any knowledge of the subsurface and which takes into account all free-surface multiples, including receiver ghosts. A non-linear synthetic data example consisting of pressure and particle velocity fields is used to illustrate the procedure.

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Combining two seismic experiments to attenuate free‐surface multiples in OBC data*

Ikelle

1999

Geophysical Prospecting

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Using even terms of the scattering series for deghosting and multiple attenuation of ocean‐bottom cable data

Ikelle

1999

GEOPHYSICS

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Inverse scattering multiple attenuation (ISMA) is a method of removing free‐surface multiple energy while preserving primary energy. The other key feature of ISMA is that no knowledge of the subsurface is required in its application. I have adapted this method to multicomponent ocean‐bottom cable data (i.e., to arrays of sea‐floor geophones and hydrophones) by selecting a subseries made of even terms of the current scattering series used in the free‐surface multiple attenuation of conventional marine surface seismic data (streamer data). This subseries approach allows me to remove receiver ghosts (receiver‐side reverberations) and free‐surface multiples (source‐side reverberations) in multicomponent OBC data. I have processed each component separately. As for the streamer case, my OBC version of ISMA preserves primary energy and does not require any knowledge of the subsurface. Moreover, the preprocessing steps of muting for the direct wave and interpolating for missing near offsets are no longer needed. Knowledge of the source signature is still required. The existing ways of satisfying this requirement for streamer data can be used for OBC data without modification. This method differs from the present dual‐field deghosting method used in OBC data processing in that it does not assume a horizontally flat sea floor; nor does it require the knowledge of the acoustic impedance below the sea floor. Furthermore, it attenuates all free‐surface multiples, including receiver ghosts and source‐side reverberations.

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Peg‐leg and free surface multiple removal, a key to imaging subsalt reflectors

Cited by 2 publications

References 0 publications

Combining two seismic experiments to attenuate free‐surface multiples in OBC data*

Combining two seismic experiments to attenuate free‐surface multiples in OBC data*

Using even terms of the scattering series for deghosting and multiple attenuation of ocean‐bottom cable data

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