Ekofisk PRM Seismic Operations

The world’s largest optical Permanent Reservoir Monitoring (PRM) system was installed at Ekofisk in 2010. The Ekofisk LoFS system consists of nearly 4000 seabed multicomponent sensors and a top side recording unit provided by Optoplan and a containerized source operated on a supply vessel. After the first 4 surveys, all the sensors were still active and very high repeatability (3-4% NRMS) had been achieved. One of the key factors to unraveling full value of a PRM system is to be able to handle seismic operations in a safe, integrated and efficient manner in order to deliver high quality seismic volumes for interpretation in a rapid turnaround. In this paper, we present the different aspects of seismic operations at Ekofisk: seismic source, recording system and data transfer, QC and processing, and discuss how their integration enables timely delivery of high quality 4D seismic products.