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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A059 (1984)

First Page: 163

Last Page: 175

Book Title: M 37: Clastic Diagenesis

Article/Chapter: A Theory of Framework Grain Dissolution in Sandstones: Part 2. Aspects of Porosity Modification

Subject Group: Reservoirs--Sandstones

Spec. Pub. Type: Memoir

Pub. Year: 1984

Author(s): R. M. Siebert, G. K. Moncure, R. W. Lahann

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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