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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2009. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/10240808059
Pore-throat sizes in sandstones, tight sandstones, and shales
Philip H. Nelson1
1U.S. Geological Survey, Box 25046, Federal Center, Denver, Colorado 80225-0046; [email protected]
ABSTRACT
Pore-throat sizes in siliciclastic rocks form a continuum from the submillimeter to the nanometer scale. That continuum is documented in this article using previously published data on the pore and pore-throat sizes of conventional reservoir rocks, tight-
gas
sandstones, and shales. For measures of central tendency (mean, mode, median), pore-throat sizes (diameters) are generally greater than 2 
m in conventional reservoir rocks, range from about 2 to 0.03 m in tight-gas
sandstones, and range from 0.1 to 0.005 m in shales. Hydrocarbon molecules, asphaltenes, ring structures, paraffins, and methane, form another continuum, ranging from 100 A (0.01 m) for asphaltenes to 3.8 A (0.00038 m) for methane. The pore-throat size continuum provides a useful perspective for considering (1) the emplacement of petroleum in consolidated siliciclastics and (2) fluid flow through fine-grained source rocks now being exploited as reservoirs.
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