Static and Dynamic Geo-model and Flow Model Update Using 4D Petrophysical Seismic Inversion: an Application over Troll West

On Troll West area, the Sognefjord producing formation is thick (160 m) with very good reservoir properties and with a thin Oil leg ( straightforward overburden, leading to good quality seismic data. After more than a decade of Oil production, more than 1 million meters of horizontal drains have been drilled and the fifth monitor survey has been shot in 2009. This huge amount of data makes it a-priori particularly suitable for seismic monitoring and should lead to quantitatively reliable follow-up of the thin Oil leg thickness and production forecast. The following paper describes results from a R&D-collaboration between Statoil and CGGVeritas.