Abstract

Summary 4D-seismic interpretation plays a key role in the reservoir management of the Draugen field, situated offshore Norway. High-quality time-lapse seismic surveys conducted in 1990, 1998, 2001, and 2004 have all shown sharp resolution for the areal and vertical definition of the water movement toward the producing wells. Excellent reservoir properties with relatively few high-rate wells and an expected recovery factor exceeding 60% make Draugen one of the best performing fields offshore Norway. The field has a simple geology; however, the reservoir structure is relatively uncertain because of the low number of well penetrations for calibrating the structure. Fortunately, the 4D-seismic interpretations have largely compensated for this shortcoming by providing improved lateral control for refining the reservoir-simulation models. All of the 4D interpretations conducted so far have indicated the need for simulation-model changes such as modified reservoir volumes in certain areas, revised fault transmissibilities, and improved relative permeability characteristics. Integration of the 4D-interpretation results has greatly improved the various Draugen reservoir-simulation models, enabling improved forecast and reserves estimates as well as better business decisions. Effects on field reservoir management have included revising the water-injection strategy, converting a producer to an injector, repositioning a development well, and drilling an appraisal well.

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