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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 69 (1985)

Issue: 2. (February)

First Page: 306

Last Page: 307

Title: Anisotropic Permeability, Eolian Lyons Sandstone: ABSTRACT

Author(s): R. G. Shepherd

Article Type: Meeting abstract


Directional permeabilities from nine attitude-oriented core samples of well-laminated eolian Lyons Sandstone from Larimer County, Colorado, were measured with a gas permeameter. Intrinsic permeabilities across the laminae, parallel to lamination and dip, and parallel to lamination

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and strike, were quantified and compared. Relative permeabilities of gas over the spectrum of oil saturation and porosities were also determined.

Permeability across the laminae ranged from 0.5 to 4 md, whereas permeability parallel to lamination ranged from 3 to 97 md. Permeability parallel to lamination was not significantly different when strike and dip directions were compared. Quantitative analyses of textures and fabrics of individual laminae explain the observed diversity of permeabilities. Relative permeabilities were highest at a given oil saturation measured downdip and along the laminae and lowest when measured perpendicular to lamination.

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Copyright 1997 American Association of Petroleum Geologists