Integrating 4D Seismic, Geomechanics and Reservoir Simulation in the Valhall Oil Field

C012 Integrating 4D seismic geomechanics and reservoir simulation in the Valhall oil field. 1 P.J. HATCHELL R.S. KAWAR AND A.A. SAVITSKI Shell International Exploration and Production Rijswijk The Netherlands Summary Time-lapse seismic monitoring of compacting reservoirs measures changes that occur both inside and outside of the reservoir interval. Inside the reservoir changes in saturation porosity velocity and layer thickness alter the reflection coefficients and intra-reservoir travel times that result in both amplitude and travel time changes. Outside of the reservoir the compaction creates long-wavelength changes in the stress and strain fields that perturb the seismic velocity and produce additional changes