Integrating Frequent Time-lapse Data into the Reservoir Simulation Modeling of the Valhall Field

Abstract

The frequent time-lapse observations from the Life of Field Seismic (LoFS) system across the Valhall field have provided a wealth of new information. Time-shift and amplitude changes are matched to the predicted responses from the reservoir simulation model and used to reduce uncertainties and validate reservoir properties. Streamlined workflows are implemented to convert the reservoir simulation properties to a synthetic seismic response for any time range. A match quality factor between the observed and predicted responses is calculated based on a correlation function that quantifies the visual comparisons. This match quality factor allows us to quantitatively compare multiple LoFS time ranges, well areas and alternative reservoir models and quickly choose the parameters that best match the seismic observations. Three different case studies are shown where this method has helped us narrow the uncertainty range associated with the reservoir model parameters, which in turn improves the predictive capabilities of the reservoir simulation model. The examples show positive results in a range of different problems.