Ekofisk Life of Field Seismic - 4D Processing

We present the 4D processing sequence for the Ekofisk Permanent Reservoir Monitoring project. Four vintages of data were acquired between the end of 2010 and summer 2012 using 200km of trenched fibre optic seismic cables covering about 60 km˛ and with a total of 3966 4C sensor stations. We discuss key aspects of the processing sequence, turnaround, and the integration of expertise between client and contractor. This delivers outstanding seismic repeatability with clean, well resolvable 4D signals and low residual 4D noise (NRMS of 3-5%).