Pore-throat size distributions in Permo-Triassic sandstones from the United Kingdom and some implications for contaminant hydrogeology |
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Authors: | J Bloomfield D Gooddy M Bright P Williams |
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Institution: | (1) British Geological Survey, Wallingford, Oxfordshire, OX10 8BB, UK,;(2) University College London, Gower Street, London, WC1E 6BT, UK, |
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Abstract: | Pore-throat size distributions (PSDs) from mercury injection capillary pressure (MICP) tests have been used to characterise
153 samples of Permo-Triassic sandstones from the United Kingdom. The PSDs have been parameterised using the Brooks-Corey
and van Genuchten functions. Pore-throat sizes are in the range 0.01–427 μm, and dominant pore-throat sizes range from about
0.1–90 μm. Values of λ, the Brooks-Corey pore-size distribution index, range from 0.002–2.27, and values of m, the van Genuchten pore-size distribution index, range from 0.03–0.92. A number of classes of sandstone can be recognised
on the basis of trends in the fitted parameters. The van Genuchten function provides the most effective method for classifying
different sandstones. Additionally, a cross-plot of gas permeability against displacement pressure (derived from the van Genuchten
function) shows that the data fall into two distinct sub-populations. The frequency distribution of a larger population of
sandstone permeabilities can be modelled using the mean and standard deviation of the two sub-populations identified in the
MICP study, assuming that the sub-populations are approximated by log-normal distributions. The distribution of sandstones
with small pore-throat sizes is critical to the fate of pathogens and immiscible phase contaminants in the aquifer.
Electronic Publication |
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Keywords: | laboratory experiments pore-throat size distribution sandstones groundwater contamination |
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