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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Research
Vol. 82 (2012), No. 12. (December), Pages 899-912
Research Article

Prediction of Previous HitPermeabilityNext Hit in Quartz-Rich Sandstones: Examples Previous HitfromNext Hit the Norwegian Continental Shelf and the Fontainebleau Previous HitSandstoneNext Hit

Olav Walderhaug, Arild Eliassen, Nils Einar Aase

Abstract

Correctly predicting Previous HitsandstoneNext Hit Previous HitpermeabilityNext Hit Previous HitfromNext Hit variables such as porosity, composition, and texture is one of the major problems of petroleum geology and hydrology. Using data sets comprising composition, texture, porosity, and Previous HitpermeabilityNext Hit for Previous HitsandstoneNext Hit samples Previous HitfromNext Hit the Norwegian continental shelf and the Fontainebleau Previous HitSandstoneNext Hit, we have tested several previously suggested methods for Previous HitpermeabilityNext Hit prediction, and also suggest a new method for sandstones containing significant volumes of clay.

Our results indicate that Previous HitpermeabilityNext Hit is successfully predicted Previous HitfromNext Hit porosity and mean grain size by the Kozeny equation for most sandstones with clay contents less than 3% when porosities exceed 6–14%, with the lowest threshold values of porosity tending to occur in the sandstones containing least clay. The Kozeny equation also seems to enable calculation of the probable maximum possible permeabilities for sandstones with given porosities and grain sizes. For clay contents above 3%, the Kozeny equation typically overpredicts Previous HitpermeabilityNext Hit.

Including a percolation threshold in the Kozeny equation, using estimated macroporosity rather than total porosity, or applying a form of the equation where internal surface area is used as input instead of grain size does not provide generally acceptable Previous HitpermeabilityNext Hit estimates. However, a modified Kozeny equation which includes a parameter reflecting the type of pore system often provides useful Previous HitpermeabilityNext Hit estimates even for clay-rich samples. This parameter can often be regarded as a constant for a specific formation or Previous HitsandstoneNext Hit unit when porosity variations are not excessive. Mercury-injection data suggest that its value is controlled by the width and connectivity of the dominant flow paths through the system, which in turn are probably determined by factors such as volume and distribution of clay.


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