Comparison of Klinkenberg-corrected gas permeability and water permeability in sedimentary rocks
International Journal of Rock Mechanics and Mining Sciences Volume 46 Issue 2
Page 229-238
published_at 2009-02
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Title ( eng ) |
Comparison of Klinkenberg-corrected gas permeability and water permeability in sedimentary rocks
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Creator |
Tanikawa Wataru
Shimamoto Toshihiko
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Source Title |
International Journal of Rock Mechanics and Mining Sciences
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Volume | 46 |
Issue | 2 |
Start Page | 229 |
End Page | 238 |
Abstract |
Quick measurements of permeability can be made by using gas as the pore fluid. To apply gas permeability data to the evaluation of water permeability, the difference between gas and water permeabilities needs to be assessed. We measured intrinsic permeability of sedimentary rocks from the western foothills of Taiwan by using nitrogen gas and distilled water as pore fluids in effective-pressure cycling tests at room temperature. The observed difference in gas and water permeabilities was analyzed in view of the Klinkenberg effect. This effect is due to the slip flow of gases at pore walls, which enhances gas flow when pore sizes are very small. Our experimental results showed that (1) gas permeability was larger than water permeability by several times to one order of magnitude, (2) gas permeability increased with increasing pore pressure, and (3) water permeability increased slightly as the pore-pressure gradient across the specimen increased. Results (1) and (2) can be explained quantitatively by an empirical power law in relation to the Klinkenberg constant b that is applicable in low permeable range. This correlation enables us to estimate water permeability from gas permeability. The Klinkenberg effect is important when permeability is lower than 10-18 m2 and at low pore-pressure differentials, and correction for the effect is essential to estimate water permeability from gas permeability measurement data. A simplified Bingham flow model for water can partially explain the trend of result (3), though non-Darcy flow behavior or inertial forces of water-rock interaction are needed to account for the observed deviation from Darcy's law.
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Keywords |
Gas permeability
Water permeability
Klinkenberg effect
Sedimentary rock
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NDC |
Earth sciences. Geology [ 450 ]
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Language |
eng
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Resource Type | journal article |
Publisher |
Elsevier Science Ltd.
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Date of Issued | 2009-02 |
Rights |
Copyright (c) 2008 Elsevier Ltd
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Publish Type | Author’s Original |
Access Rights | open access |
Source Identifier |
[ISSN] 1365-1609
[DOI] 10.1016/j.ijrmms.2008.03.004
[NCID] AA1116472X
[DOI] http://dx.doi.org/10.1016/j.ijrmms.2008.03.004
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