MEASUREMENT OF SEISMIC SIGNAL WHILE DRILLING USING SMALL-SIZE DOWNHOLE THREE COMPONENT SEISMIC DETECTOR AND ESTIMATION OF SUBSURFACE STRUCTURE

DOI Web Site 3 References
  • SOMA Nobukazu
    社団法人 土木学会 産業技術総合研究所 地圏資源環境研究部門
  • UTAGAWA Manabu
    社団法人 土木学会 産業技術総合研究所 エネルギー利用研究部門
  • SETO Masahiro
    社団法人 土木学会 産業技術総合研究所 企画本部 総括企画
  • CHO Akio
    産業技術総合研究所 地圏資源環境研究部門
  • ASANUMA Hiroshi
    東北大学大学院 環境科学研究科

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Other Title
  • 小型軽量坑井内3成分弾性波検出器による坑井掘削音の観測と地下構造推定法の検討

Abstract

A geophysical prospecting technique using seismic signal while drilling has been applied to a relatively small-scale drilling in a civil engineering such for high level nuclear waste disposal repository. For the purpose of it, a small-size downhole three component seismic detector was developed for measuring drilling signal. Then, the performance of the measurement system was verified by a calibration test using an artificial seismic source. A data acquisition of in-situ drilling signal was conducted during a drilling at a granitic quarry, and subsurface structure were estimated by the triaxial drillbit VSP method. The distribution of underground reflection coefficients was obtained to a depth of about 300m by drilling signals from only 10m drilling, and the estimated image agrees well with other borehole observations.

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