| Full text | |
| Author(s): |
Zhao, H.
[1]
;
Gelius, L. -J.
[1]
;
Tygel, M.
[2]
;
Nilsen, E. Harris
[3]
;
Evensen, A. Kjelsrud
[3]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | JOURNAL OF APPLIED GEOPHYSICS; v. 168, p. 118-127, SEP 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 13/08293-7 - CCES - Center for Computational Engineering and Sciences |
| Grantee: | Munir Salomao Skaf |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |