In this report, we showed that localized variations in velocities and absorption have smooth effect on seismic amplitude with increasing offset and can hinder AVO analysis. We also showed that the effect of highly absorptive anomalies on seismic amplitude can be of the same magnitude as the effect of small velocity perturbation. Consequently, a possible cancellation of concurrent effects of velocity and absorption can cause different amplitude signatures, which could be confused with the signature of smaller absorption or velocity anomalies.
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