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Seismic data gathered on land is distorted by
irregular acquisition topography. Most seismic imaging algorithms are applied
to data which is shifted to a planar datum. In regions of mild topography
a static shift is adequate to perform this transformation
Jones and Jovanovich (1985), however as the
necessary shift increases in magnitude, the static approximation becomes
inadequate. In this situation a procedure based on
wave-equation extrapolation is more appropriate than static shift
Shtivelman and Canning (1988); Wiggins (1984).
The procedure is similar to wave-equation
datuming of marine data Berryhill (1986); Yilmaz and Lucas (1986).
However for data to be continued through some media, the velocity structure
of that media must be known. The process of continuing
the data and finding the velocity structure at the same time makes the
process of wave-equation extrapolation difficult for land data.
I propose a method based on wave-equation extrapolation to be applied
to data gathered in regions with irregular acquisition topography and where
the near-surface velocity structure is unknown. The method is intended
as an alternative to large static shifts.

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Stanford Exploration Project

11/18/1997