A new method for multiple attenuation in the parabolic X-P domain

Evgeny Landa, Igor Belfer, Shemer Keydar

Research output: Contribution to conferencePaperpeer-review

Abstract

So far the problem of multiple attenuation has been solved only partially. One of the most common methods of attenuating multiples is the Radon transform based approach. We propose a new method for attenuation of both surface related and interbed multiples in the parabolic τ-p domain. The method is based on the prediction of a multiple model from the wave front characteristics of the primary events. Multiple prediction comprises the following steps: 1. For a given multiple code, the angles of emergence and the radii of wave front curvatures are estimated for primary reflections for each receiver in the CSP gather. 2. The intermediate points which compose a specified multiple event are determined for each shot-receiver pair. 3. Traveltimes of the multiples are calculated. Wavefields within a time window around the predicted traveltime curves may be considered as multiple model traces which we use for the multiple attenuation process. Using the predicted multiple traveltimes, we can defme the area in the x-p domain which contains the main energy of the multiple event. Resolution improvement of parabolic radon operator can be achieved through simple multiplication of each sample in the x-p space by a nonlinear semblance function. In this work we expand the idea of defining the multiple reject areas automatically by comparing the energy of the multiple model and the original input data in the x-p space. We illustrate the usefulness of this algorithm for the attenuation of multiples on both synthetic and real data.

Original languageEnglish
Pages1402-1405
Number of pages4
StatePublished - 1997
Externally publishedYes
Event1997 Society of Exploration Geophysicists Annual Meeting, SEG 1997 - Dallas, United States
Duration: 2 Nov 19977 Nov 1997

Conference

Conference1997 Society of Exploration Geophysicists Annual Meeting, SEG 1997
Country/TerritoryUnited States
CityDallas
Period2/11/977/11/97

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