Results from a Multi-Faceted Surveillance Program at the Giant Ormen Lange Gas Field

Ormen Lange is Norway's second largest gas field. The key uncertainties for field management and late life development are aquifer influx and reservoir compressibility. Seismic data quality over the field is extremely challenging and expected seismic changes due to production were predicted to be small. Therefore, a multi-faceted program of reservoir surveillance was planned, consisting of seismic, gravity and seafloor geodesy. Combining and calibrating all the recorded surveillance data has given us a rich dataset for interpretation and has provided crucial information on lateral connectivity, compressibility and water movement.