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Title: Parameters influencing porosity in sandstones: a model for sandstone porosity prediction

Abstract

Thirteen parameters were reviewed for their influence on porosity in sandstone 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 porosity may be preserved for every 1000 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 porosity and the first-order parameters. This function permits porosity prediction with a high degree of accuracy. The 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 porosity is excluded, and estimations will therefore be conservative where leaching occurred. Due to interrelationship of compaction and cementation, the porosity reduction by cement is usually only a small fraction of the total reduction. The function can therefore also be applied to little-cemented sandstones. 4 figures, 3 tables.

Authors:
Publication Date:
Research Org.:
Shell Espana, Madrid, Spain
OSTI Identifier:
6341951
Resource Type:
Journal Article
Journal Name:
AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
Additional Journal Information:
Journal Volume: 71:5
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; SANDSTONES; DIAGENESIS; POROSITY; GEOTHERMAL GRADIENTS; RESERVOIR ROCK; SEDIMENTARY BASINS; GEOLOGIC STRUCTURES; ROCKS; SEDIMENTARY ROCKS; TEMPERATURE GRADIENTS; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Scherer, M. Parameters influencing porosity in sandstones: a model for sandstone porosity prediction. United States: N. p., 1987. Web. doi:10.1306/703C80FB-1707-11D7-8645000102C1865D.
Scherer, M. Parameters influencing porosity in sandstones: a model for sandstone porosity prediction. United States. https://doi.org/10.1306/703C80FB-1707-11D7-8645000102C1865D
Scherer, M. 1987. "Parameters influencing porosity in sandstones: a model for sandstone porosity prediction". United States. https://doi.org/10.1306/703C80FB-1707-11D7-8645000102C1865D.
@article{osti_6341951,
title = {Parameters influencing porosity in sandstones: a model for sandstone porosity prediction},
author = {Scherer, M},
abstractNote = {Thirteen parameters were reviewed for their influence on porosity in sandstone 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 porosity may be preserved for every 1000 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 porosity and the first-order parameters. This function permits porosity prediction with a high degree of accuracy. The 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 porosity is excluded, and estimations will therefore be conservative where leaching occurred. Due to interrelationship of compaction and cementation, the porosity reduction by cement is usually only a small fraction of the total reduction. The function can therefore also be applied to little-cemented sandstones. 4 figures, 3 tables.},
doi = {10.1306/703C80FB-1707-11D7-8645000102C1865D},
url = {https://www.osti.gov/biblio/6341951}, journal = {AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)},
number = ,
volume = 71:5,
place = {United States},
year = {Fri May 01 00:00:00 EDT 1987},
month = {Fri May 01 00:00:00 EDT 1987}
}