Capillary trapping in sandstones and carbonates

dependence on pore structure

Yukie Tanino, Martin J. Blunt

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Residual non-wetting phase saturation and wetting-phase permeability were measured in three limestones and four sandstones ranging in porosity from 0.13 to 0.28 and in absolute permeability from 2 × 10-15 to 3 × 10-12 m2. This paper focuses on the residual state established by waterflooding at low capillary number from minimum water saturation achieved using the porous plate technique, which yields the maximum residual under strongly water-wet conditions. The pore coordination number and pore body-throat aspect ratio of each rock were estimated using pore networks extracted from X-ray microtomography images of the rocks. Residual saturation decreases with increasing porosity, with no apparent difference in magnitude between the limestones and sandstones at a given porosity. Thus intraparticle/intra-aggregate microporosity does not significantly alter the efficiency of capillary trapping in the rocks considered presently. Residual saturation broadly decreases as conditions become less favorable for snap-off, i.e., with decreasing pore aspect ratio and increasing coordination number. The measured residual saturations imply that capillary trapping may be an effective mechanism for storing carbon dioxide in both sandstones and carbonates provided that the systems are strongly water-wet.
Original languageEnglish
Article numberW08525
Number of pages13
JournalWater Resources Research
Volume48
Issue number8
DOIs
Publication statusPublished - Aug 2012

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trapping
sandstone
saturation
carbonate
porosity
limestone
rock
permeability
wetting
water
carbon dioxide
co-ordination

Cite this

Capillary trapping in sandstones and carbonates : dependence on pore structure. / Tanino, Yukie; Blunt, Martin J.

In: Water Resources Research, Vol. 48, No. 8, W08525, 08.2012.

Research output: Contribution to journalArticle

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