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Seismic Dispersion in Extra-Heavy Oil Saturated Rock

Summary This expanded abstract presents a modern method for modeling a porous rock saturated with highly viscous liquid. Using a combination of a De Ghetto and Cole-Cole Maxwell (CCM) models, and a coherent potential approximation (CPA) effective medium theory, the acoustic velocity of carbonate rock saturated with extra-heavy oil at 22% porosity was predicted to vary ~100 m/s across a frequency range form ultrasonic (1MHz) down to seismic (50Hz) at a temperature of 20 o C. Results show significant velocity dispersion that would not be apparent when using Gassmann-Biot effective medium theories. The work presented here has implications for future studies to consider a more sophisticated modeling approach when dealing with extra-heavy oil as pore fluid in rock. This work may lead to help solve the problem of unexplained phenomena observed in seismic records and sonic logs in the field.