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Suppression of Apex-Shifted Multiples with a Shifted-Hyperbola Radon TransformNormal access

Authors: E. Duveneck, E. Causse, D. Lokshtanov, K. Hokstad, R. Fillon and J. F. Dutzer
Event name: 68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006
Session: Multiple Removal
Publication date: 12 June 2006
DOI: 10.3997/2214-4609.201402190
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 860.19Kb )
Price: € 20

Summary:
Apex-shifted multiples in CMP gathers are difficult to suppress and can seriously degrade seismic imaging results. To address this problem, we present a high-resolution Radon transform based on shifted hyperbolae with an additional apex-shift parameter. This transform allows focusing of apex-shifted events with a wide range of shapes, leading to a better separation and suppression of apex-shifted multiples. In order to make the transform computationally efficient, while obtaining good focusing in the multi-dimensional Radon domain, a restricted set of Radon parameter values is determined using a frequency-domain high-resolution Radon transform. A time-domain Radon transform is then performed on the restricted set of parameter values. The method is demonstrated on a synthetic data example involving apex-shifted pegleg multiples associated with a dipping seafloor. The multiples are successfully removed by muting in the Radon domain.


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