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The response of time migration to a point diffractor in a v(x) medium is
a cusp-shaped curve called a plume. Migration velocity analysis is strongly
influenced by the behavior of the plume as the migration velocity is changed.
We have examined the dependence of the zero-offset
plume on migration
velocity by migrating synthetic data. The observed velocity dependence is
confirmed by the common-tangent construction. A simple first-order theory
qualitatively
explains the behavior of zero-offset time migration. It is clear that a more
complete understanding of migration velocity analysis with time migration
in a v(x) medium requires a finite-offset theory.
Next: REFERENCES
Up: Black et. al.: Plume
Previous: FIRST-ORDER THEORY OF PLUME
Stanford Exploration Project
11/17/1997