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

    研究成果: Contribution to journalArticle査読

    5 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)679-686
    ページ数8
    ジャーナルMaterials Transactions
    56
    5
    DOI
    出版ステータス出版済み - 1 1 2015

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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