Conclusions

The velocity-estimation method with beam-stacked data was successful in estimating a low-velocity anomaly from field data. Depth migrating the data using the estimated velocity model corrected the mispositioning of the reflectors caused by the anomaly and improved the focusing of the result.

The estimated velocity well explains the prestack data and, in particular, the beam-stacked data. An analysis of the beam-stacked data shows that the resolution of beam stacks is sufficient for the measurement of different effects of the velocity anomaly on reflections stacked at different values of the offset ray parameter.