F-20 OSEBERG 4D STUDY – THE SEARCH FOR REMAINING OIL H. RUTLEDAL 1 E. ERTRESVÅG 1 and J.I. BERG 2 Summary The Oseberg Field has currently produced 80% of the initial oil reserves and time lapse seismic is in the process of being used to plan infill wells. A feasibility and pilot study carried out in 1997-1998 showed promising results. The regional changes in the 4D processed datasets from 1992 and 1999 confirm to some extent the reservoir model but show differences in detail. A multiple crossing the main reservoir interval poses challenges in the interpretation. Introduction 1 1 Norsk


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