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For the analyzed dataset, the velocity of seismic
reflection events varies less than 100m/s with frequency across the
usual exploration spectrum. There is no information available
indicating greater variation for other
datasets. Future wave-equation migration velocity analysis tools may
allow for still greater variation, since the computational expense is not higher, and
the inversion is more stable if the output of velocity analysis for
low frequencies is taken as a starting model for higher
frequencies. The dispersion in reflected waves does
not warrant discarding proven velocity analysis and
imaging software tools, but is worth considering when
trying to build significantly more accurate ones.

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Stanford Exploration Project

10/14/2003