Discrimination between Pressure and Fluid Saturation Changes in Compacting Reservoirs from Time-Lapse Seismic Data

P073 Discrimination between Pressure and Fluid Saturation Changes in Compacting Reservoirs from Time-Lapse Seismic Data T. Roste (Statoil ASA) & M. Landrø* (NTNU) SUMMARY A method based on time-lapse amplitude variation with offset (AVO) analysis is presented to discriminate between pressure and saturation changes in compacting reservoirs. Based on laboratory measurements the reservoir compaction (or porosity loss) is related to the pressure and saturation changes. By using this empirical relation explicit expressions for computing pressure- and saturation-related changes from timelapse seismic data are obtained. The expressions are tested on synthetic models for different reservoir scenarios. EAGE 69 th Conference &