Time-lapse (4D) seismic data acquired over the Norwegian North Sea Jotun Field is used to monitor water<br>sweep in the Paleocene-age Heimdal reservoir. Inversion of the seismic differences provides a direct<br>measure of the impedance increase associated with water displacing oil. This high-resolution image of water<br>sweep is consistent with production logging tool (PLT) data acquired in seven wells in the field. Combined<br>with integrated reservoir facies interpretations and with other production data, the 4D data successfully<br>derisked several proposed infill well locations and has identified new workover candidates and drilling<br>opportunities in the field. The results of this work demonstrate the strength of applying multidisciplinary<br>team efforts and partner cooperation to optimize asset value through tailored data acquisition programs and<br>drilling.


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