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Anisotropic Velocity ModelsGold Open Access

Author: C.H. Chapman
Event name: 5th International Congress of the Brazilian Geophysical Society
Session: Seismic Anisotropy
Publication date: 07 November 1997
Organisations: SBGf
Language: English
Info: Abstract, PDF ( 445.6Kb )

An essential pre-requisite for successful 3D pre-stack depth migration in structurally complicated situations is an accurate background velocity. Building such a model, even for isotropic velocities, is still difficult despite advances in 3D model building, ray tracing and velocity analysis. In complicated models, velocity anisotropy will be important to image structures with significant variations in dip, e.g. faults or salt domes. The evidence for anisotropy is strong, and a few theoretical and case studies have illustrated its importance in migration.

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