Conclusions

We present an application of the WEMVA methodology to 4-D seismic data. If certain physical conditions are met, this velocity analysis method is capable of identifying the producing reservoirs, even for the cases of production from multiple levels.

4-D pre-processing remains an important component of the method. We need to insure that all image perturbations are not related to differences in acquisition and/or processing, but only to changes of the physical parameters of the reservoir. Furthermore, since our processing is purely acoustic, we also need to insure that the image changes are dominated by changes of compressional slowness, and not by other elastic effects.