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In thermally enhanced recovery processes like cyclic steam stimulation (CSS)or steam assisted gravity drainage (SAGD), continuous steam injection entailschanges in pore fluid, pore pressure and temperature in the rock reservoir,that are most often unconsolidated or weakly consolidated sandstones. This inturn increases or decreases the effective stresses and changes the elasticproperties of the rocks. Thermally enhanced recovery processes give rise tocomplex couplings. Numerical simulations have been carried out on a case studyso as to provide an estimation of the evolution of pressure, temperature, porefluid saturation, stress and strain in any zone located around the injector andproducer wells. The approach of Ciz and Shapiro (2007) - an extension of theporoelastic theory of Biot-Gassmann applied to rock filled elastic material -has been used to model the velocity dispersion in the oil sand mass underdifferent conditions of temperature and stress. A good agreement has been foundbetween these predictions and some laboratory velocity measurements carried outon samples of Canadian oil sand. Results appear to be useful to betterinterpret 4D seismic data in order to locate the steam chamber.

Evolution of seismic velocities in heavy oil sand reservoirs during thermal recovery process