We processed, interpreted, and analyzed experimental time-lapse converted-wave 2D-seismic reflection data that were acquired across a bitumen field undergoing cyclical steam injection and production at Cold Lake, Alberta, Canada. The purpose was to assess whether multicomponent-seismic data could be used to detect lateral and/or temporal changes caused by steam injection into the reservoir. We interpreted horizons on PP and PS sections that bracket the reservoir, and calculated VP/VS over this interval. Away from the steam injection wells, VP/VS values average 2.20±0.02 during steaming and production and are close to the theoretically predicted value of 2.21 for a cold reservoir. Near the wells, VP/VS is lower during steam injection than during production, averaging 2.11±0.02, and the lowest values are observed close to the injection wells. We attributed the changes in VP/VS to changes in the reservoir caused by the injection of steam.

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