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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 71 (1987)

Issue: 5. (May)

First Page: 485

Last Page: 491

Title: Parameters Influencing Previous HitPorosityNext Hit in Sandstones: A Model for Previous HitSandstoneNext Hit Previous HitPorosityNext Hit Prediction

Author(s): M. Scherer (2)

Abstract:

Thirteen parameters were reviewed for their influence on Previous HitporosityNext Hit in Previous HitsandstoneNext Hit core material during compaction. In basins of average geothermal gradients, the first-order parameters are age (time of burial), detrital-quartz content, maximum depth of burial, and sorting. Overpressure may slow the compaction process. Depending on onset of overpressure during burial, approximately 2% primary Previous HitporosityNext Hit may be preserved for every 1,000 psi (6.9 MPa) above hydrostatic pressure. Depth-related temperature and median grain size were found to be only second-order parameters. On the basis of 428 cases, function coefficients were calculated for the relationship between Previous HitporosityNext Hit and the first-order parameters. This function permits Previous HitporosityNext Hit prediction with a high degree of accuracy. Th equation is valid for sandstones older than 3 Ma with little or no cement, no leaching, depth of burial in excess of 500 m, and little or no shear stresses. Secondary Previous HitporosityNext Hit is excluded, and estimations will therefore be conservative where leaching occurred. Due to interrelationship of compaction and cementation, the Previous HitporosityTop reduction by cement is usually only a small fraction of the total reduction. The function can therefore also be applied to little-cemented sandstones.

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