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DSO Velocity Inversion: A "Gas Cloud" Synthetic Example
RICE UNIV HOUSTON TX DEPT OF COMPUTATIONAL AND APPLIED MATHEMATICS
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A low velocity near surface anomaly delays the seismic wavefield and focuses wavefronts passing through it. Such anomalies occur as a result of localized gas seepages gas clouds in the sedimentary column, for example. Use of a migration velocity model not containing the anomaly will produce images containing false synclinal structures. Application of DSO velocity inversion to a simple example of this type images the velocity anomaly and removes the false structure.
APPROVED FOR PUBLIC RELEASE