In the originally published version of this article the rows in Figure 6b were inverted. Figure 6 and its caption have been corrected on 30 January 2014.
A re-examination of throats
Article first published online: 20 NOV 2013
©2013. American Geophysical Union. All Rights Reserved.
Water Resources Research
Volume 49, Issue 11, pages 7615–7626, November 2013
How to Cite
2013), A re-examination of throats, Water Resour. Res., 49, 7615–7626, doi:10.1002/2013WR014254., , and (
- Issue published online: 19 DEC 2013
- Article first published online: 20 NOV 2013
- Accepted manuscript online: 5 NOV 2013 11:49AM EST
- Manuscript Accepted: 28 OCT 2013
- Manuscript Revised: 8 OCT 2013
- Manuscript Received: 12 JUN 2013
- US Department of Energy . Grant Numbers: DE-FG02–92ER14261 , DE-FG02–09ER64747
- porous media;
- pore networks
 We critically re-examine the concept of a throat in a porous medium as a geometric quantity defined independently of an entry meniscus in a drainage process. To maintain the standard notion of a throat as a locally minimum-area cross section in the pore network, we demonstrate with examples that throats must intersect each other. Using flow simulation, we show that these intersecting throats correspond to capillary pressure controlled entry points during drainage. We have designed a throat-finding algorithm that explicitly locates intersecting throats, using a planar approximation for robustness and speed. The capability of the new algorithm was compared against an existing algorithm in the construction of pore-throat networks from X-ray computed tomography images of consolidated sandstones (7.5–22% porosity) and of an unconsolidated sand pack (32.5% porosity). We show that the probability of throat intersection increases significantly with porosity above 20%; in the sand pack, over 1/4 of all throats intersect with another.