Seismic velocities are one of our most important geophysical parameters and tools. Velocity and density contrasts permit us to image reservoirs. Velocities can be used directly in such applications as overpressure prediction. They can be used through their influence on reflection coefficients and amplitudes for direct hydrocarbon indication. Attempts are commonly made to predict velocity changes during recovery processes for reservoir monitoring. Obviously, there are many reasons why we need a complete understanding of how velocity, behaves and relates to our objectives.

Considerable effort is expended to reconcile velocity values made through surface seismic, crosshole, well log, and laboratory techniques....

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