On Troll West area, the Sognefjord producing formation is thick (160 m) with very good reservoir<br>properties and with a thin Oil leg (<26 m). It is relatively shallow (1.5 km) under a structurally<br>straightforward overburden, leading to good quality seismic data. After more than a decade of Oil<br>production, more than 1 million meters of horizontal drains have been drilled and the fifth monitor<br>survey has been shot in 2009. This huge amount of data makes it a-priori particularly suitable for<br>seismic monitoring and should lead to quantitatively reliable follow-up of the thin Oil leg thickness<br>and production forecast. The following paper describes results from a R&D-collaboration between<br>Statoil and CGGVeritas.


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