Nine surveys have been conducted over the Grane field since the installation of the Permanent Reservoir Monitoring (PRM) system in 2014. Efficient seismic operations and fast delivery of 4D products to the interpreters are essential components of the PRM solution. The time span of a Grane PRM acquisition and processing cycle is currently about one month. But what happens when the acquisition coverage is much sparser than expected, for instance because of poor weather? Can reliable 4D PRM products still be extracted? We present a processing strategy designed to handle cases where the coverage of the acquired lines strongly deviates from the nominal coverage. Obtained results show that valuable 4D products, consistent with all previous PRM vintages, can be extracted out of such incomplete monitor dataset.


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