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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 28 (1978), Pages 323-325

Previous HitPorosityNext Hit Loss in Previous HitSandstoneNext Hit by Ductile Grain Deformation During Compaction

Earle F. McBride (1)


As exploration for hydrocarbons moves to greater depths, attention must be paid to the amount of Previous HitporosityNext Hit lost in sandstones by compaction. Deformation of ductile grains is the chief cause of Previous HitporosityNext Hit reduction during compaction except in nearly pure quartz sandstones. Shale clasts and micaceous rock fragments (argillite, slate, schist, and phyllite) are the chief ductile grains in Previous HitsandstoneNext Hit, but glauconite and fecal pellets are locally abundant. The amount of Previous HitporosityNext Hit loss by deformation of these grains depends on their abundance and amount of overburden. It is common for sandstones to lose from 5 to 15% Previous HitporosityNext Hit this way. Some lithic arenites and glauconitic sands have lost their entire Previous HitporosityNext Hit during compaction. Knowledge of Previous HitsandstoneNext Hit composition is helpful in Previous HitpredictingNext Hit the amount of Previous HitporosityTop lost by ductile-grain deformation.

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