Green`s function implementation of common-offset, wave-equation migration
- Institut Francais du Petrole, Pau (France)
- Amoco Production Co., Tulsa, OK (United States)
Common-offset migration is extremely important in the context of migration velocity analysis (MVA) since it generates geologically interpretable migrated images. However, only a wave-equation-based migration handles multipathing of energy in contrast to the popular Kirchhoff migration with first-arrival traveltimes. The authors have combined the superior treatment of multipathing of energy by wave-equation-based migration with the advantages of the common-offset domain for MVA by implementing wave-equation migration algorithms via the use of finite-difference Green`s functions. With this technique, the authors are able to apply wave-equation migration in measurement configurations that are usually considered to be of the realm of Kirchhoff migration. In particular, wave-equation migration of common offset sections becomes feasible. The application of the wave-equation, common-offset migration algorithm to the Marmousi data set confirms the large increase in interpretability of individual migrated sections, for about twice the cost of standard wave-equation common-shot migration. The implementation of wave-equation migration via the Green`s functions is based on wavefield extrapolation via paraxial one-way wave equations. For these equations, theoretical results allow one to perform exact inverse extrapolation of wavefields.
- OSTI ID:
- 428195
- Journal Information:
- Geophysics, Vol. 61, Issue 6; Other Information: PBD: Nov-Dec 1996
- Country of Publication:
- United States
- Language:
- English
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