Pore-scale computation of material and transport ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

Pore-scale computation of material and transport properties of North-Sea reservoir rocks
Author:Pal-Eric Oeren <peoe@numericalrocks.com> (Numerical Rocks AS)
Stig Bakke <stig@numericalrocks.com> (Numerical Rocks AS)
Rudolf Held <rujh@statoil.com> (Statoil ASA)
Presenter:Rudolf Held <rujh@statoil.com> (Statoil ASA)
Date: 2006-06-18     Track: Special Sessions     Session: Pore-Scale Modelling: New Developments And Applications

The acquisition of digitized representations of rock microstructures has been established in the workflow for investigation of petrophysical, material, and transport properties. The availability of these data open the way for the development of methods that directly predict effective properties based on digitized topological information. The increasing number of effective properties that may be numerically calculated includes elastic moduli, electrical resistivities, fluid permeabilities, or constitutive relationships for multiphase flow. This work investigates different sandstone lithofacies in a North Sea field with these analyses. We compare samples acquired by X-ray Microtomography with digitized samples of reconstructed lithofacies. The latter are based on back-scattered electron images of standard 2D petrographic thin sections. The study largely shows an excellent agreement of the effective properties for the microCT and reconstructed samples for these heterogeneous rock types. Limitation in resolution of microCT data are revealed, where effective properties are sensitive to details of the microstructure. Our results allow interpretation of effective medium properties with respect to the investigated lithofacies and presentation of cross- property relations. Such cross-property relationships become especially useful, when one property is more readily obtained than another.