H048 Possibility of Utilizing Downhole Seismic Studies for Monitoring of the Process of Heating of a Reservoir Formation Saturated by Bituminous Oil Steam M.V. Chertenkov & A.N. Kasimov* (PetroAlliance) SUMMARY The physical prerequisite for conducting operations was the hypothesis that temperature impact on sand reservoirs with properties specific for Devonian sandstones of the Yarega Field would result in changing the P wave propagation velocity. That said the first stage of insignificant heating to 50-60°C would result in a small increase of P wave velocity (possibly by 5-7%) while further increase of temperature should result in significant reduction of velocity (by


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