An engineering‐driven approach for separating pressure and saturation using 4D seismic: application to a Jurassic reservoir in the UK North Sea

Abstract

A technique is shown for estimating pressure and saturation changes from 4D seismic without the need for rock and fluid physics. This is a further refinement and development of a previously published method. Here, a multi‐attribute approach is taken, in which a cycle of calibration, training, and principal component analysis produces an optimal combination of attributes. The methodology is applied to a Jurassic reservoir in the UK North Sea with encouraging results. It has highlighted saturation changes previously hidden by the effect of pore pressure on the rock frame, even where AVO methods have failed, and can be validated against flow rates for water production.