Spectral Decomposition in a Heavy-oil and Bitumen Sand Reservoir
Carmen C. Dumitrescu, Larry Lines, 2013. "Spectral Decomposition in a Heavy-oil and Bitumen Sand Reservoir", Heavy-oil and Oil-sand Petroleum Systems in Alberta and Beyond, Frances J. Hein, Dale Leckie, Steve Larter, John R. Suter
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In this chapter, seismic-attribute spectral decomposition (SD) is used for understanding heavy-oil and bitumen sand reservoir behavior and comprehending their heterogeneities for future reservoir simulation. Spectral decomposition is performed on the migrated stack and on amplitude-versus-offset (AVO) attributes (P- and S-wave impedance reflectivity). Examples provided in this chapter are from reservoirs with cold and thermal production. The observed differences between SD performed on P- and S-wave impedance reflectivity are explained with the solid state of the oil sands at their preproduction reservoir condition. The interpretation of the seismic attributes is based on the poroelastic and viscoelastic behaviors of the heavy oil and/or bitumen. The reservoir characteristics identified on the spectrally decomposed AVO attributes can be summarized as follows: (1) higher energy at the top and base of the reservoir is associated with shale; (2) medium to high energy is an indication of water sand; (3) low energy in the middle of the reservoir is commonly associated with thick bitumen zones that have high absorption; and (4) the bitumen-water interface is identified.