AVO processing of walkaway VSP data at Ross Lake heavy oilfield, Saskatchewan

Zimin Zhang, Robert R. Stewart, Donald C. Lawton

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.