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This paper presents the benefits of surveillance efforts adopted for monitoring a waterflood in a geologically complex reservoir<br>that contains high-viscosity (90 cp) oil. The reservoir is part of a large brownfield in South Oman and has been on production<br>for more than 25 years. The development of the reservoir has been carried out in phases and full-field water injection was<br>started after approximately 18 years of primary depletion. The water-flood project is expected to increase recovery factor by<br>about 10% over primary depletion.