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Near subsurface velocity anomaly
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Fast velocity carbonates (reef-like?) with complex relief affects S/N ratio and structure image. Pre-tack depth migration is used to resolve the problem with iterative modelling including tomography carried out in the next stage. The final depth section shows much better imaging beneath the velocity anomaly. Quality improvement is observed over the whole section.

Post-stack time migrated section Velocity model
Post-stack time migrated section. Velocity model.
 
Pre-stack depth migration - depth section
Pre-stack depth migration - depth section.
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