Grane Permanent Reservoir Monitoring System has been installed in 2014 and five PRM surveys have been acquired till date. High quality 4D seismic is part of standard work process in Grane and ensures better well planning and optimization, production and injection well monitoring, and completion health check. Being able to identify relationships and trends between various types of dynamic data (e.g. 4D seismic and production) allows for better understanding of reservoir behaviour, which then translates into efficient actions with regard to well planning/optimization as well as model update for better predictions. In this work, we have identified a strong correlation between the liquid (cumulative oil plus water) production and a 4D seismic attribute sensitive to gas-oil contact movement for the Grane field, which has also helped to convert 4D responses into thickness changes and quantify the gas movement.


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