The many benefits of traveltime compression for 3D prestack Kirchhoff migration

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Kirchhoff 3-D prestack migration, as part of its execution, requires repeated access to a usually large traveltime table data base. Access to this data base implies either a memory intensive or I/O bounded solution to the storage problem. Proper compression of the traveltime table allows efficient 3-D prestack migration without relying on the usually slow access to the computer hard-drive. Such compression also allows for faster access to desirable parts of the traveltime table. Compression is applied to the traveltime field for each source location on the surface on a regular grid using 3-D cosine transforms of the traveltime field represented in the Celerity domain. We obtain practical compression levels up to and exceeding 20 to 1. In fact, because of the smaller size traveltime table, we obtain exceptional traveltime extraction speed during migration that exceeds conventional methods. Additional features of the compression include better interpolation of traveltime tables and more stable estimates of amplitudes from traveltime curvatures. Copyright 2006, European Association of Geoscientists and Engineers.
Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers, 68th European Association of Geoscientists and Engineers Conference and Exhibition, incorporating SPE EUROPEC 2006, EAGE 2006: Opportunities in Mature Areas
PublisherSociety of Petroleum Engineersbooks@spe.org
Pages2081-2085
Number of pages5
StatePublished - Jan 1 2006
Externally publishedYes

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