Evolution of permeability during fracturing processes in rocks under conditions of geological storage of CO2

Takashi Fujii, Takahiro Funatsu, Yasuki Oikawa, Masao Sorai, Xinglin Lei

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigated experimentally the change in permeability in three different types of soft rocks including mudstone, sandstone, and tuff from the Fureoi and Takinoue formations, which are representative of the CCS demonstration site at Tomakomai in Japan, and another type of mudstone from the Besho Fm. (B-M). Permeability during deformation, shear fracturing, and post-failure slipping is estimated from measured flow rate and differential pore pressure. In addition, the morphologies of the shear fracture zones were examined using the X-ray CT scanning technique. All the samples exhibit typical brittle-fracturing behaviors, except for the B-M sample which does not show a major shear fracture. During the fracturing process, the permeability increased by one to three orders of magnitude. Further changes in the post-failure slipping and stress relaxation regimes show strong dependence on the type of rocks. Observed changes in permeability can be interpreted as results of fracturing creation, shear zone smoothing, closure and reactivation of fractures under different stress regimes.

Original languageEnglish
Pages (from-to)679-686
Number of pages8
JournalMaterials Transactions
Volume56
Issue number5
DOIs
Publication statusPublished - Jan 1 2015

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fracturing
permeability
Rocks
rocks
shear
Pore pressure
Stress relaxation
Sandstone
Shear deformation
stress relaxation
sandstones
Demonstrations
Flow rate
smoothing
closures
Scanning
X rays
Japan
flow velocity
porosity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Evolution of permeability during fracturing processes in rocks under conditions of geological storage of CO2. / Fujii, Takashi; Funatsu, Takahiro; Oikawa, Yasuki; Sorai, Masao; Lei, Xinglin.

In: Materials Transactions, Vol. 56, No. 5, 01.01.2015, p. 679-686.

Research output: Contribution to journalArticle

Fujii, Takashi ; Funatsu, Takahiro ; Oikawa, Yasuki ; Sorai, Masao ; Lei, Xinglin. / Evolution of permeability during fracturing processes in rocks under conditions of geological storage of CO2. In: Materials Transactions. 2015 ; Vol. 56, No. 5. pp. 679-686.
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