Piltun-Astokh Static Model Update on the Basis of the Sequence Stratigraphy Approach

Abstract

Dynamic simulation of the geological (static) model for Sakhalin Energy's Piltun and Astokh fields indicates that the model does not capture the subsurface accurate enough to allow acceptable history matching of actual production data. Since this means that the predictability of the models is low as well (which complicates proper field development) it was decided to rebuild the model and replace the existing layer-based model with a facies-based one. The 3D seismic data for the Piltun-Astokhskoye field was reprocessed as well since the previous model and the improved imaging was used to update the seismic interpretation based on Sequence Stratigraphic principles.