Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/61885
Type: Artigo
Title: Dip correction for coherence-based time migration velocity analysis
Author: Schleicher, Jörg
Biloti, Ricardo
Abstract: Migration velocity analysis (MVA) is a seismic processing step that aims to translate residual moveout in an image gather after migration with an erroneous velocity model into velocity updates. An analysis of the position of a reflection event in an image gather after migration with an incorrect velocity allows us to extend the original coherence-based MVA approach to dipping reflectors. The extended MVA technique includes the reflector dip which is treated as an additional search parameter that is to be detected together with the velocity updating factor. Both parameters are searched for simultaneously by the application of two-parameter search techniques. The search consists of determining trial curves as a function of the search parameters and stacking the migrated data along these curves. The highest coherence determines the best-fitting curve and thus the optimal parameter pair. A numerical example demonstrates that the additional search parameter improves the quality of the velocity updates, thus requiring less iterations in the MVA.
Migration velocity analysis (MVA) is a seismic processing step that aims to translate residual moveout in an image gather after migration with an erroneous velocity model into velocity updates. An analysis of the position of a reflection event in an image
Subject: Ondas sísmicas
Sismologia
Métodos iterativos (Matemática)
Prospecção - Métodos geofísicos
Country: Estados Unidos
Editor: Society of Exploration Geophysicists
Citation: Geophysics. Soc Exploration Geophysicists, v. 72, n. 1, n. S41, n. S48, 2007.
Rights: Fechado
Identifier DOI: 10.1190/1.2400844
Address: https://library.seg.org/doi/abs/10.1190/1.2400844
Date Issue: 2007
Appears in Collections:IMECC - Artigos e Outros Documentos

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