A permanent reservoir monitoring system was installed at the Ekofisk field in summer 2010. Four seismic surveys have been acquired between winter 2010 and summer 2012. Excellent repeatability of the acquisition geometry and 3-4 week processing turnaround enable to exploit time lapse seismic results to optimise the reservoir management. Three examples are discussed where 4D results add information key to characterisation, prediction and decision making. The first example demonstrates an area where a few wells lack pressure support and production is affected. A second example shows how 4D data enabled diagnosis of a well failure, and how the lessons learnt from this well are being used to prevent mechanical issues at other wells. The third example shows a seismic PLT in a well giving valuable information regarding distribution of influx in the well within 1-1/2 months of the well coming online.


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