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Seismic Imaging in Anisotropic Media. or... "A Better Way to Moveout and Migrate Long Offset Data"
Anisotropic effects are observed for the moveout velocity on surface seismic data as reflection angles increase. An alternative to conventional means of moving out non-zero offset data is derived by direct mathematical substitution of Snells Law into a non hyperbolic moveout equation. This Apparent Anisotropic Moveout method has been named AAMO. The effectiveness of this process is demonstrated on a full elastic synthetic model and real data. It provides a cost effective and more exact alternative to "high order" moveout approximations. This process produces benefits when larger reflection angles are retained in processing for studies such as amplitude variation with offset (AVO) and depth conversion velocity analysis. Anisotropic effects are also present when imaging steeply dipping events. The usefulness of the AAMO equation is demonstrated by use of a Kirchhoff pre stack time migration that takes anisotropy into account.
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