Common-Refection-Surface (CRS) Stacking with Diffraction Moveouts of Varying Aperture

Faccipieri, Jorge H.; Coimbra, Tiago A.; Tygel, Martin; Gelius, Leiv‐J.

doi:10.3997/2214-4609.20140587

Cited by 3 publications

(1 citation statement)

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“…Note que a região delimitada pela abertura proposta, δ (m) , se ajusta bem ao evento de reflexão seja qual for o valor do parâmetro B. De modo a introduzir a construção de tais guias, será proposto um fluxo de trabalho interativo e iterativo para aplicação do método CRS (Faccipieri et al, 2015). Em cada iteração, estimações globais e exaustivas de parâmetros são realizadas, porém, restritas a um pequeno conjunto de pontos, cirurgicamente selecionados por um intérprete, que compreende a parte interativa desse fluxo.…”

Section: Aberturas Semiautomáticasunclassified

Método CRS interativo com controle semiautomático de aberturas

Faccipieri¹

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Este trabalho não seria possível sem a ajuda de diversas pessoas às quais gostaria de expressar meus sinceros agradecimentos: Aos meus pais, Jorge e Patrícia, por todo carinho, dedicação e suporte em todos esses anos. Muito obrigado! A Natalia Gomes Gonçalves pela compreensão, por todos os finais de semana e noites em que fiquei ausente para me dedicar a esse trabalho. Sou muito grato por tudo que você fez e pelo que deixou de fazer para me ajudar com essa tese de doutorado.Ao meu orientador Prof. Dr. Martin Tygel, pelas discussões científicas e por permitir que eu cursasse as disciplinas do doutorado em horário de trabalho. Além disso, gostaria também de agradecer pela oportunidade que me foi dada em 2010, no meu mestrado, sem a qual eu não teria alcançado tudo que alcancei. Muito obrigado por tudo.Ao meu quase segundo orientador, Dr. Armando Lopes Farias, pelos conselhos e pelas intensas discussões, regadas a muito frango, durante minhas visitas à Petrobras. Muito obrigado por compartilhar sua vasta experiência e conhecimentos comigo. Ao Prof. Dr. Edson Borin, pelos conselhos, apoio e por compartilhar seu conhecimentos.Aos amigos do Grupo de Geofísica Aplicada: Alcides Goldoni, por estar sempre presente e disposto a resolver qualquer problema técnico que surgisse; Caian Benedicto e Ian Liu Rodrigues, pelas discussões científicas e pela enorme ajuda, especialmente no que diz respeito a implementação de programas; Dany Rueda Serrano, pelas discussões, sugestões, dados processados e principalmente, por oferecer opiniões sinceras sobre cada resultado que lhe foi mostrado; João Renato D. Sacramento, pelos conselhos e por compartilhar responsabilidades na administração do laboratório; Tiago Antonio Alves Coimbra, pelas discussões científicas, pelos conselhos, por compartilhar ideias e pelas indicações de videos do YouTube. Mais uma vez, muito obrigado a todos! Vocês são excelentes no que fazem e esse trabalho nunca teria sido concluído sem as colaborações individuais de cada um de vocês.

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Section: Aberturas Semiautomáticasunclassified

Método CRS interativo com controle semiautomático de aberturas

Faccipieri¹

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Seismic imaging of complex structures with the CO-CDS stack method

et al. 2016

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Various seismic imaging methods are introduced to resolve some of the possible ambiguities of seismic interpretation in complex structures. Reducing dependency of imaging techniques on velocity or using diffraction energy for imaging more structural details are the main topics of the imaging research. In this study, we try to improve the seismic image quality in semi-complex structures by combining the common reflection surface (CRS) method with a diffraction based scheme in the common-offset domain. Previously introduced partial CRS and common offset CRS methods exhibited reliable performance in imaging complex media. Here, we were looking for stable and efficient solutions, preserving advantages of the previous methods. Herewith, the proposed operator fits better to diffractions than to reflections. Therefore, we call it the commonoffset common diffraction surface stack (CO CDS). In a previous study, improvement of the quality of seismic image by the CRS method was achieved by combination of the CDS method with the partial CRS. This resulted in the introduction of the partial CDS. Initially, in this study, the common-offset CRS traveltime equation was modified to the common-offset CDS. The hypothetical shot reflector experiment in the CRS method was changed to shot diffraction point experiment. In the introduced operator, two wavefront curvatures, observed at receivers positions, are set equal in order to satisfy the diffraction condition. In the proposed method, we search for accurate attribute sets for each considered offset individually, and then form a new operator by four coherent attributes. Application of the common-offset CDS method on synthetic and field data shows more details of the geological structures with higher quality, while preserving continuity of reflection events. The proposed method is, however, more expensive than the partial and common offset CRS for large dataset.

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Stacking apertures and estimation strategies for reflection and diffraction enhancement

et al. 2016

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It is well known that the quality of stacking results (e.g., noise reduction, event enhancement, and continuity) can be greatly influenced not only by the traveltime operator chosen but also by the apertures used. We have considered two so-called diffraction-stack traveltimes, together with the corresponding apertures, designed to enhance reflections and diffractions, respectively. The first one is the common-reflection-surface (CRS) diffraction traveltime that is obtained from the general CRS traveltime upon the condition that the target reflector reduced to a point, which we refer to as the diffraction CRS (DCRS) traveltime. The second one is the double-square-root (DSR) traveltime, well established in time migration. We have observed that the DCRS and DSR traveltimes depend on fewer parameters (two in 2D and five in 3D) than the full CRS traveltime (three in 2D and eight in 3D). For the DCRS and DSR traveltimes, we have proposed specific apertures based on the projected Fresnel zone, which are able to produce high-quality stacked sections using less parameters to be estimated. The key factor in that approach lies in the choice of traveltime operators together with careful selection of stacking apertures. In particular, suitable choices of operators and apertures lead to stacking volumes in which reflections are enhanced (and the diffractions are attenuated) or the corresponding ones in which diffractions are enhanced (and reflections are attenuated). Synthetic and field data confirm the proposed approach has good potential for image-quality improvement.

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Common-Refection-Surface (CRS) Stacking with Diffraction Moveouts of Varying Aperture

Cited by 3 publications

References 4 publications

Método CRS interativo com controle semiautomático de aberturas

Método CRS interativo com controle semiautomático de aberturas

Seismic imaging of complex structures with the CO-CDS stack method

Stacking apertures and estimation strategies for reflection and diffraction enhancement

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