Stress-dependence of the permeability and porosity of sandstone and shale from TCDP Hole-A

Jia Jyun Dong, Jui Yu Hsu, Wen Jie Wu, Toshi Shimamoto, Jih Hao Hung, En-Chao Yeh, Yun Hao Wu, Hiroki Sone

Research output: Contribution to journalArticle

206 Citations (Scopus)

Abstract

We utilize an integrated permeability and porosity measurement system to measure the stress dependent permeability and porosity of Pliocene to Pleistocene sedimentary rocks from a 2000m borehole. Experiments were conducted by first gradually increasing the confining pressure from 3 to 120MPa and then subsequently reducing it back to 3MPa. The permeability of the sandstone remained within a narrow range (10-14-10-13m2). The permeability of the shale was more sensitive to the effective confining pressure (varying by two to three orders of magnitude) than the sandstone, possibly due to the existence of microcracks in the shale. Meanwhile, the sandstone and shale showed a similar sensitivity of porosity to effective pressure, whereby porosity was reduced by about 10-20% when the confining pressure was increased from 3 to 120MPa. The experimental results indicate that the fit of the models to the data points can be improved by using a power law instead of an exponential relationship. To extrapolate the permeability or porosity under larger confining pressure (e.g. 300MPa) using a straight line in a log-log plot might induce unreasonable error, but might be adequate to predict the stress dependent permeability or porosity within the experimental stress range. Part of the permeability and porosity decrease observed during loading is irreversible during unloading.

Original languageEnglish
Pages (from-to)1141-1157
Number of pages17
JournalInternational Journal of Rock Mechanics and Mining Sciences
Volume47
Issue number7
DOIs
Publication statusPublished - 2010 Oct 1

Fingerprint

Shale
Sandstone
shale
Porosity
porosity
sandstone
permeability
confining pressure
Sedimentary rocks
microcrack
Microcracks
unloading
Boreholes
Unloading
sedimentary rock
Pliocene
power law
borehole
Pleistocene
experiment

Keywords

  • Effective confining pressure
  • Permeability
  • Porosity
  • Specific storage
  • Stress history

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Stress-dependence of the permeability and porosity of sandstone and shale from TCDP Hole-A. / Dong, Jia Jyun; Hsu, Jui Yu; Wu, Wen Jie; Shimamoto, Toshi; Hung, Jih Hao; Yeh, En-Chao; Wu, Yun Hao; Sone, Hiroki.

In: International Journal of Rock Mechanics and Mining Sciences, Vol. 47, No. 7, 01.10.2010, p. 1141-1157.

Research output: Contribution to journalArticle

Dong, Jia Jyun ; Hsu, Jui Yu ; Wu, Wen Jie ; Shimamoto, Toshi ; Hung, Jih Hao ; Yeh, En-Chao ; Wu, Yun Hao ; Sone, Hiroki. / Stress-dependence of the permeability and porosity of sandstone and shale from TCDP Hole-A. In: International Journal of Rock Mechanics and Mining Sciences. 2010 ; Vol. 47, No. 7. pp. 1141-1157.
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