Laboratory measurements on tar-sand cores saturated with heavy oil show that seismic wave velocity decreases as the temperature increases. We use this physical effect to monitor the progress of a steam flood operation in the Midway Sunset Field in California. Results of seismic wave velocity tomograms acquired both before and after steam flooding show quite dramatically how temperature affects the seismic wave velocity. The heated heavy oil in the reservoir is delineated, and the information can be used by the production engineer for evaluating the progress of the EOR method.

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