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Porosity: Porosity Classification (definitions, criteria)

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Published:
January 01, 1979

Abstract

PRIMARY

Interparticle—very common.

Intraparticle—rare, but possible within rock fragments, fossils, and other detrital grains.

Intercrystal-rare? Remnant primary porosity can be significant within clay cements.

SECONDARY

Dissolution of detrital grains—common, especially removal of feldspars, carbonate rock fragments or fossils, or detrital sulphates.

Dissolution of authigenic cements—very common removal of calcite, dolomite, and siderite; significant removal of gypsum and/or anhydrite.

Dissolution of authigenic replacement minerals—common removal of carbonate or sulphate minerals.

Shrinkage—minor; can be significant in glauconitic sediments.

Fracturing—minor except locally.

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Contents

AAPG Memoir

A Color Illustrated Guide To Constituents, Textures, Cements, and Porosities of Sandstones and Associated Rocks

Peter A. Scholle
Peter A. Scholle
U.S. Geological Survey
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American Association of Petroleum Geologists
Volume
28
ISBN electronic:
9781629811925
Publication date:
January 01, 1979

GeoRef

References

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