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Book Chapter

A Theory of Framework Grain Dissolution in Sandstones

By
R. M. Siebert
R. M. Siebert
Conoco Inc. Ponca City, Oklahoma
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G. K. Moncure
G. K. Moncure
Conoco Inc. Houston, Texas
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R. W. Lahann
R. W. Lahann
Conoco Inc. Ponca City, Oklahoma
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Published:
January 01, 1984

Abstract

Framework grain dissolution (FGD) involving feldspars and rock fragments was found to be significant to reservoir properties in sandstones with more than 10% soluble grains. FGD porosity ranged up to approximately 70% and averages about 30% of the visible porosity in a study of some reservoir sandstones. FGD does not appreciably increase reservoir permeability. However, the amount of FGD porosity developed was found to be a function of the sandstone’s initial permeability.

We propose that clay and organic maturation in shales produce the necessary water, acid, and complexing agents for FGD. The FGD solvent is expelled into the sandstones where feldspars and rock fragments are dissolved, and the resulting aqueous aluminum is complexed for transport out of the sandstone.

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Contents

AAPG Memoir

Clastic Diagenesis

David A. McDonald
David A. McDonald
Petro-Canada Calgary, Alberta
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Ronald C. Surdam
Ronald C. Surdam
University of Wyoming Laramie, Wyoming
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American Association of Petroleum Geologists
Volume
37
ISBN electronic:
9781629811598
Publication date:
January 01, 1984

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