3D Prestack Fourier Mixed-Domain (FMD) depth migration for VTI media with large lateral contrasts

Autor(es)

Zhao, H. ^[1] ; Gelius, L. -J. ^[1] ; Tygel, M. ^[2] ; Nilsen, E. Harris ^[3] ; Evensen, A. Kjelsrud ^[3]

Afiliação do(s) autor(es)

^[1] Univ Oslo, Dept Geosci, Sem Saelands Vei 1, N-0371 Oslo - Norway

^[2] Univ Estadual Campinas, Ctr Petr Studies, Rua Cora Coralina 350, Campinas, SP - Brazil

^[3] Lundin Norway AS, Oslo - Norway

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF APPLIED GEOPHYSICS; v. 168, p. 118-127, SEP 2019.
• Citações Web of Science: 0

Resumo

Although many 3D One-Way Wave-equation Migration (OWEM) methods exist for VTI media, most of them struggle either with the stability, the anisotropic noise or the computational cost. In this paper we present a new method based on a mixed space- and wavenumber-propagator that overcome these issues very effectively as demonstrated by the examples. The pioneering methods of phase-shift (PS) and Stolt migration in the frequency-wavenumber domain designed for laterally homogeneous media have been followed by several extensions for laterally inhomogeneous media. Referred many times to as phase-screen or generalized phase screen methods, such extensions include as main examples of the Split-step Fourier (SSF) and the phase-shift plus interpolation (PSPI). To further refine such phase-screen techniques, we introduce a higher-order extension to SSF valid for a 3D VTI medium with large lateral contrasts in vertical velocity and anisotropy parameters. The method is denoted Fourier Mixed-Domain (FMD) prestack depth migration and can be regarded as a stable explicit algorithm. The FMD technique was tested using the 3D SEG/EAGE salt model and the 2D anisotropic Hess model with good results. Finally, FMD was applied with success to a 3D field data set from the Barents Sea including anisotropy. (C) 2019 The Authors. Published by Elsevier B.V. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs