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Abstract

AAPG Bulletin, V. 93, No. 6 (June 2009), P. 719-739.

Copyright copy2009. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/03160908131

Pore-throat characterization in highly porous and permeable sandstones

Bassem S. Nabawy,1 Yves Geraud,2 Pierre Rochette,3 Nicolas Bur4

1Department of Geophysical Sciences, National Research Centre, Cairo, Egypt; [email protected]
2Institut de Physique du Globe de Strasbourg, France
3Le Centre Europeen de Recherche et d'Enseignement des Geosciences de l'Environnement (CEREGE), Centre National de la Recherche Scientifique (CNRS) Aix-Marseille Universite, France
4Institut de Physique du Globe de Strasbourg, France

ABSTRACT

Several methods have been developed to characterize the pore spaces in Previous HitsandstoneNext Hit reservoirs using data on the pore-throat-size distribution obtained Previous HitfromNext Hit mercury injection tests. The Winland equation, the threshold pressure, the displacement pressure, and Pittman's equation are mostly used for this purpose to delineate the stratigraphic traps and seals.

This study examines the reliability of these methods applied to the highly permeable Nubia sandstones in their type section in southern Egypt. These sandstones are composed mainly of siliceous sandstones and constitute the main Paleozoic–Cretaceous aquifers and reservoirs in Egypt. Routine core analysis and mercury injection tests were conducted to delineate the pore network characteristics for these rocks.

The relationships between helium porosity and the uncorrected air Previous HitpermeabilityNext Hit Previous HitfromNext Hit the routine core analysis, and the various parameters derived Previous HitfromNext Hit mercury injection–capillary pressure curves were established using multiple regressions.

This study indicates the high reliability of the displacement pressure at 10% mercury saturation and also reveals the apex of Pittman's hyperbole at 45% mercury saturation as a complexity apex at which the pore network becomes highly chaotic.

Despite the great benefits of such types of measurements, they are not commonly used because of their high cost. This study introduces a series of empirical equations for constructing a partial pore-aperture-size distribution curve Previous HitfromNext Hit routine core analysis for the highly permeable rocks.

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