• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of physical properties of rocks for understanding fluid migration in the crust

Research Project

Project/Area Number 17K05628
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionUniversity of Toyama

Principal Investigator

Watanabe Tohru  富山大学, 学術研究部都市デザイン学系, 教授 (30262497)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords地震波速度 / 電気伝導度 / 岩石物性 / 水 / クラック / 流体 / 地震 / 浸透率 / 地殻 / 岩石 / 輸送特性
Outline of Final Research Achievements

Simultaneous measurements of elastic wave velocity and electrical conductivity on brine-saturated rocks were conducted under confining pressure and microstructure of pores examined. Some cracks have remarkable variation in aperture. Narrow aperture parts are closed under pressure, while wide aperture parts remain open at high pressure. Such wide aperture parts in cracks govern velocity and conductivity. Numerical experiments on the percolation of open grain boundary have shown that more than 25% of grain boundaries must be open to form an interconnected network of open grain boundaries. Wide aperture parts in cracks must form connected paths also in the crust. Such pores can shoe observed seismic velocity and electrical conductivity in the crust.

Academic Significance and Societal Importance of the Research Achievements

地殻内部には,さまざまなサイズのクラックが存在しており,開口もクラック内で大きく変化しているはずである。地殻内のクラックにおいても,開口の大きな部分が閉じ残っているはずである。この閉じ残りが,地震波速度や電気伝導度を支配していると考えられる。物性測定と微細構造観察を通して,地殻流体に具体的なイメージを与えたことにより,観測量から流体量を推定することが可能になった。地殻流体は,地殻の変形や地震活動に大きな影響を与えている。流体分布を具体的に推定することは,地震発生の場を理解することであり,地殻における地震活動の深い理解につながると考えている。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2019 2018

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Invited: 1 results)

  • [Journal Article] Elastic wave velocity and electrical conductivity in a brine-saturated rock and microstructure of pores2019

    • Author(s)
      Watanabe Tohru、Makimura Miho、Kaiwa Yohei、Desbois Guillaume、Yoshida Kenta、Michibayashi Katsuyoshi
    • Journal Title

      Earth, Planets and Space

      Volume: 71 Issue: 1 Pages: 129-129

    • DOI

      10.1186/s40623-019-1112-9

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Fluid distribution in the crust - inference from seismic velocity and electrical conductivity2019

    • Author(s)
      渡辺 了,吉田健太
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 地震波速度・電気伝導度から推定される地殻内の流体分布2019

    • Author(s)
      渡辺 了,富岡愛梨奈,吉田健太,Debois Guillaume
    • Organizer
      日本地質学会第126年(2019年)山口大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] A new apparatus for measuring elastic wave velocity, electrical conductivity and permeability of fluid-saturated rocks at various confining and pore-fluid pressures2018

    • Author(s)
      渡辺 了,片境 悠,荒舘佳子
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] A new apparatus for measuring elastic wave velocity, electrical conductivity and permeability of fluid-saturated rocks at various confining and pore-fluid pressures2018

    • Author(s)
      片境 遥,荒舘佳子,渡邊 了
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2017 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi