Abstract
The mapping of thermal fronts associated with EOR techniques from the surface has important application to improved reservoir stimulation. Real-time knowledge of how a thermal EOR front is developing would help and operator to optimize production well placement as well as to take corrective steps to maximize production. The surface mapping technique that we are evaluating is the controlled-source audio frequency magnetotelluric (CSAMT) electromagnetic (EM) induction geophysical prospecting technique. The analysis of the field data, using results from laboratory studies, is described. Normalized maps show the location of the steam front that is in agreement with production data, temperature data from monitoring wells, and posttest coring data. The location of a major bypass of steam into an underlying formation was also mapped. The results indicate that the CSAMT technique shows promise for monitoring steam-front locations.
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