Abstract
The paper presents results from a project in which the contribution from creep on compaction of the Ekofisk oil and gas reservoir is studied. Creep parameters are derived from long-term uniaxial strain tests on the formation rock for specific porosity classes. The accumulated thickness within each porosity class is used to establish a one-dimensional model of the reservoir. Laboratory tests with sea water injections (SWI) are used to model the effect of SWI on creep. The pore pressure depletion history for the reservoir in combination with arching effects, is used to estimate the effective stress history in the reservoir. The role of creep to date is addressed and future compaction predictions for different pore pressure scenarios are presented.
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