Probabilistic Inversion of Multiple 4D Seismic as Applied on Schiehallion Field

Many fields in the North Sea have several 4D monitor seismic surveys, creating the opportunity to understand production effects over time more completely. This paper presents a case study from the Schiehallion Field where a baseline and seven monitors have been put through a simultaneous AVO inversion (24 seismic volumes in total). We describe a technique that derives quantitative estimates of reservoir pressure and fluid saturations at the time of each monitor survey, allowing optimization of the dynamic simulation model. The availability of multiple seismic vintages can give a more complete and consistent representation of production and injection. This aids the integration of geoscience and reservoir engineering disciplines to produce better field management decisions.