Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hu, T. Articles by Wen, S. Search for Related Content GeoRef GeoRef Citation

Multiple attenuation using beamforming onshore and offshore China

Peking University, Beijing, China

Runqiu Wang

Petroleum University, Beijing, China

Guofa Li

Dagang Oil Field, CNPC, Tianjin, China

Shuliang Wen

China National Offshore Oil Corporation, Hebei, China

Corresponding author: tianyue@pku.edu.cn

The first 20% of the full text of this article appears below.

Strong multiples generated by a coral reef can be identified from a 2D, 4-s common offset section recorded in the offshore South China Sea. In order to reject these multiples with reasonable computation effort, beamforming multiple attenuation was applied by using overlap reject bands. The offshore results show that this method can attenuate some very strong multiples and enhance weak primaries.

Multiple attenuation, a long-standing challenge in seismic processing, is particularly difficult in areas of complex geology. The Radon transform is useful in eliminating multiples in prestack data but it does not preserve amplitude at near offsets due to artifacts generated in the forward transform domain. Thus, beamforming has been developed especially to handle cases in which preserving amplitude and/or top muted prestack data is important.

Minimum variance unbiased (MVU) beamforming is a multichannel filter which extracts seismic reflection signals without distortion, while minimizing residual noise power. Adaptive beamforming estimates signal and noise characteristics before extraction. Beamforming has a long history in signal processing. White (1988) demonstrated how MVU beamforming can extract primary seismic reflections. Details of the theory and implementation of adaptive beamforming are given by Hu and White (1998); the justification for concluding that that technique can attenuate strong multiples and enhance weak primaries . . . [Full Text of this Article]