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Integrating Petrographic, Petrophysical and 3-D Pore Scale Measurements of Core Material from the Shuaiba Reservoir in Al Shaheen, Qatar

Frank, Søren 1; van Buchem, Frans 1; Rasmussen, Torben 1; Larsen, Jens 1; Sok, Rob 2; Arns, Christoph 2; Knackstedt, Mark 2
1 Maersk Oil Qatar, Doha, Qatar.
2 Australian National University, Canberra, ACT, Australia.

A multi-scale approach is used to improve prediction of petrophysical properties, such as permeability and capillary pressure, from sedimentary facies. The purpose is to establish a rock-typing system that reflects the 3D pore structure, and can be confidently distributed at the field-scale.

An integrated petrographic, petrophysical and 3D pore scale study of core from the Shuaiba reservoir in Al Shaheen, Qatar was performed on a set of 16 core samples using 3D micro-CT imaging at resolutions down to 3 microns. Further experimental analysis via scanning electron microscopy (SEM) was undertaken to probe the pore scale structure to scales of 100 nm. The 3D pore space geometry (pore and throat sizes) and topology (pore interconnectivity) were quantified allowing for the definition of a 3D pore-scale reservoir rock typing (3DRRT) scheme for the imaged samples. This rock typing was then coupled with petrophysical (capillary pressure, porosity, permeability) measurements undertaken both in the laboratory and directly on the digital image data.

The direct enumeration of the 3D connectivity of specific pore types within core material allows for a much better prediction of the resultant porosity-permeability and capillary pressure relationships. The identified rocks types from the 3DRRT scheme are integrated with the facies distribution scheme and used to refine the Shuaiba reservoir geological model.


AAPG Search and Discovery Article #90090©2009 AAPG Annual Convention and Exhibition, Denver, Colorado, June 7-10, 2009