Development of 4D imaging technique for subsurface fluids using electromagnetic methods

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22326
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Ishizu Keiichi 東京工業大学, 理学院, 研究員 (80880054)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 電磁探査 / 4Dイメージング / 地下流体 / モニタリング / 逆解析 / 比抵抗 / 時空間変化 / 物理探査

Outline of Final Research Achievements

The focus on geothermal production enhancement systems and volcanic eruption prediction has led to a need for technology that can elucidate not only the 3D spatial distribution of subsurface fluids but also the temporal variation of that spatial distribution. In this study, I have developed a technique for elucidating the spatio-temporal distribution of subsurface fluid using electromagnetic monitoring. Specifically, I have developed a numerical analysis technique (4D imaging technique: 3D space + 1D time axis) that can estimate the spatio-temporal variation of subsurface resistivity structure from electromagnetic monitoring data.

Free Research Field

地球物理

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した電磁探査法による4Dイメージング技術では，地表の観測から地下流体の時空間分布を把握できる。本技術は，様々な地下流体へ適用可能であるため，地熱増産システムなどの資源分野のみならず，マグマ水蒸気噴火予知などの防災分野，核廃棄物地層処分などの環境分野にも貢献できる。また，本技術は，非破壊で地下流体の時空間分布を調査できるため，既存の地下掘削を用いた技術に比べて低コストである。