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SPWLA Distinguished Speaker Series. The use of fluid pressure measurements and resistivity-derived water saturation models to predict a free water level depth often has limited applications in reservoirs experiencing complex saturation histories. However, the Almond formation at the Wamsutter field presents some characteristics (i.e., unchanged subsurface structure after hydrocarbon charge) that make a saturation-height modelling exercise worthwhile.

Composite drainage capillary pressure (Pc) curves are built by combining stressed mercury intrusions with the centrifuge Pc when wetting phase saturations are lower than 40%. Composite imbibition Pc curves are constructed by combining stressed mercury extrusion tests with counter current imbibition-derived maximum gas trapped saturation.

Preliminary observations in tens of wells show that the reference resistivity-derived water saturation can be fitted by drainage saturation-height functions in the majority of the Almond section. Some upper Almond shoreface bars display anomalously high water sat which could be explained by imbibition of water due to trap leaking or by reservoirs being not fully charged.

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