A 4D Seismic Surprise at Gannet B and a Way Forward through Seismically-Constrained, Scenario-Based Reservoir Modelling

F-04 A 4D SEISMIC SURPRISE AT GANNET B AND A WAY FORWARD THROUGH SEISMICALLY- CONSTRAINED SCENARIO-BASED RESERVOIR MODELLING M. BENTLEY 1 and M. HARTUNG 2 Abstract 1 1 TRACS International Falcon House Union Grove Lane Aberdeen AB10 6XU UK 2 Shell UK Exploration and Production Background Gannet B is part of a 7-field cluster operated by Shell Expro on behalf of Shell and ExxonMobil. It is a small (ca.250-300 Bscf) gas field with an uneconomically thin oil rim developed by depletion through two subsea wells. One well is completed on the thick (up to 600ft) Forties sands the other on