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 over this interval. Away from the steam injection wells, values average during steaming and production and are close to the theoretically predicted value of 2.21 for a cold reservoir. Near the wells, is lower during steam injection than during production, averaging , and the lowest values are observed close to the injection wells. We attributed the changes in to changes in the reservoir caused by the injection of steam.