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- W2065513862 abstract "Existing migration schemes cannot handle the two most important problems of migration simultaneously: 1) steep dip imaging and 2) arbitrary velocity variations in all directions. For example, phase shift (w, migration is accurate for nearly all dips but it is limited in its velocity handling (Gazdag, 1978). On the other hand finite difference schemes consider arbitrary velocity functions but they attenuate steeply dipping events. In this paper the downward continuation operator is split into two downward continuation operators, where one operator is a phase shift operator for the constant background velocity and the second operator is an optimized finite difference operator for the varying component of the velocity function. If there is no variation of velocity = c) then automatically only a phase shift operator will be applied, on the other hand if there is a strong variation of c), then the phase shift component is suppressed and the optimized finite difference operator will be fully applied. Therefore the proposed method is a hybrid one. The cascaded application of phase shift and finite difference operators shows a better maximum dip angle behaviour than the finite difference operator alone, and can be applied for arbitrary velocity functions." @default.
- W2065513862 created "2016-06-24" @default.
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- W2065513862 date "1993-01-01" @default.
- W2065513862 modified "2023-09-27" @default.
- W2065513862 title "Extended split‐step migration by cascading phase shift and optimized finite‐difference operators" @default.
- W2065513862 cites W1997678737 @default.
- W2065513862 doi "https://doi.org/10.1190/1.1822674" @default.
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