To optimize the value of time-lapse seismic data, it is essential to understand the reservoir architecture and structure in 3D. Only then can we attribute 4D signal to specific reservoir flow units, and 4D signal boundaries to flow barriers such as stratigraphic margins or faults. We present a case study on the UK Nelson oil field, which, with its multiple seismic monitor surveys and strong 4D water sweep signal, is a world-class example of 4D data. We show how 3D and 4D interpretation can explain variability in sweep and thus identify infill drilling requirements.<br>


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