3-D multiple attenuation

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting


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367 21, G01V 136, G01V 138




A computationally economical method for applying multi-dimensional multiple-reflection attenuation to a marine seismic-signal data set comprised of a plurality of common shot gathers that have surface-multiple wavefields embedded therein. The multi-dimensional data are assumed to have been gathered from a plurality of parallel 2-D lines of survey. From every nth reference line, where n is a small number greater than 2, a common shot gather is selected. For every so-selected common shot gather, a reference surface-multiple wavefield is predicted as a function of offset and travel time with the aid of any well-known multiple attenuation routine, using a wavelet having fixed attributes in terms of amplitude, phase and frequency. A common shot gather is chosen from among the plurality of common shot gathers. The predicted surface-multiple wavefield nearest to the chosen common shot gather is adaptively filtered to match the predicted surface-multiple wavefield to the surface-multiple wavefield embedded in the chosen common shot gather. The matched predicted surface multiple wavefield is subtracted from the embedded surface multiple wavefield to provide a multiple-free common shot gather.

patent: 4907205 (1990-03-01), Yanchak
patent: 5448531 (1995-09-01), Dragoset, Jr.
patent: 5587965 (1996-12-01), Dragoset, Jr. et al.


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