The AVO processing and analysis of walkaway VSP data at Ross Lake heavy oilfield, Saskatchewan is described in this report. A walkaway VSP geometry has advantages for AVO analysis: True amplitude processing is feasible and undesired wave-propagation effects can be minimized. At the top and the base of the target channel sand, the synthetic seismogram and walkaway VSP processing results show a similar amplitude variation with offset for the reflections of both PP and PS waves. These results indicate the promise of rock properties inversion using AVO gather from walkaway VSP.
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