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A New Generalized Screen Propagator for Wave Equation Depth MigrationNormal access

Authors: H. Zhao, L.J. Gelius and M. Tygel
Event name: 77th EAGE Conference and Exhibition 2015
Session: Seismic Imaging Theory - Advances in RTM, Time and Angle Domain Migration
Publication date: 01 June 2015
DOI: 10.3997/2214-4609.201412786
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.77Mb )
Price: € 20

Summary:
We revisit the extrapolation operator for wave equation depth modelling and migration in the frequency-wavenumber domain, and propose a new generalized screen propagator which can handle both steep dipping angles as well as large lateral velocity variations. A simple controlled ZO-data set associated with a dipping reflector of 60 degrees and strong velocity contrasts was depth-migrated employing a 1st order version of the new generalized screen propagator. The method reconstructed the dipping reflector accurately and with negligible distortions. Alternative use of the Split Step Fourier (SSF) and the 1st order Extended Local Born Fourier (ELBF) techniques, gave in both cases much distorted images of the same model.


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