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Specification of borehole mode contributes to frequency domain acoustic logs

Research Project

Project/Area Number 18560778
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Earth system and resources enginnering
Research InstitutionHirosaki University

Principal Investigator

SAITO Hiroyuki  Hirosaki University, Hirosaki University, Graduate School of Science and Technology, Associate Professor (70264091)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,830,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsAcoustic logging / Borehole mode / Stoneley mode / Subsurface fracture / Permeability / き裂 / 疑似レーリーモード / カットオフ周波数
Research Abstract

The ability of the frequency-domain Stoneley wave log to detect formation boundaries have been tested with field data. The dominant frequencies of Stoneley waves are highly dependent on formation properties. Formation boundaries detected from the frequency-domain Stoneley wave logs are in excellent agreement with the logs of degree of welding and lithology in the well EE-4 of the Higashi-Hachimantai geothermal field.
And, a new technique to detect thin permeable fractures in a well in which the elastic properties of the surrounding rock vary widely has been proposed. The method utilizes several Stoneley wave amplitude logs at different frequencies. The location of a permeable fracture detected with this technique agrees with the result of acoustic logging with full well-bore pressurization.
In addition, overshoot and its oscillation appearing on the transmission coefficient of Stoneley wave have been investigated. The overshoot and its oscillation are attributable to backflow of borehole … More fluid from the permeable fracture zone. The characteristic of oscillation in the backflow wave is similar to the refection wave, though the magnitude of the backflow wave is larger than that of refection wave. Therefore, the period of oscillation appearing on transmission coefficient is concerned with the thickness of a permeable fracture zone. The detailed modelling of backflow wave is important for developing a new characterization method of the permeable fracture zone.
These examples demonstrate that the frequency-domain Stoneley wave log can be used as an effective method for detection of formation boundaries and permeable fractures. The proposed technique does not require knowledge of the wave source spectrum. Only multiple Stoneley amplitude logs at different frequencies are required. The proposed technique is therefore applicable not only to logging data obtained with a broad-band logging tool, but also to the use of a variable-frequency logging tool, although in the latter case repeated measurements at different frequencies are required. Less

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (10 results)

All 2007 2006

All Journal Article (5 results) Presentation (5 results)

  • [Journal Article] 周波数領域ストンリー波検層による透水性き裂と構造の推定2007

    • Author(s)
      齊藤玄敏, 林 一夫
    • Journal Title

      日本地熱学会平成19年度学術講演会要旨集 1

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Journal Article] Fracture permeability and structure from frequency-domain Stoneley wave logs2007

    • Author(s)
      Hiroyuki SAITO and Kazuo Hayashi
    • Journal Title

      Proc. of GRSJ annual meeting 1

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] 孔内モードの周波数特性に基づく透水性き裂の計測2006

    • Author(s)
      齊藤玄敏
    • Journal Title

      自動計測制御学会東北支部第232研究集会資料 232-12

      Pages: 1-5

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Measurement of a permeable fracture based on frequency response of borehole mode2006

    • Author(s)
      Hiroyuki SAITO
    • Journal Title

      Proc of the 232nd SEIS Tohoku blanch research meeting 232-12

      Pages: 1-5

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] 孔内モードの周波数特性に基づく透水性き裂の計測2006

    • Author(s)
      齊藤 玄敏
    • Journal Title

      計測制御学会東北支部第233回研究集会論文集 233-12

      Pages: 1-5

    • Related Report
      2006 Annual Research Report
  • [Presentation] 周波数領域ストンリー波検層による透水性き裂と構造の推定2007

    • Author(s)
      齊藤玄敏, 林 一夫
    • Organizer
      日本地熱学会平成19年度学術講演会
    • Place of Presentation
      文部科学省研究交流センター(つくば)
    • Year and Date
      2007-11-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Fracture permeability and structure from frequency-domain Stoneley wave logs2007

    • Author(s)
      Hiroyuki SAITO and Kazuo Hayashi
    • Organizer
      GRSJ annual meeting 2007
    • Place of Presentation
      Tsukuba
    • Year and Date
      2007-11-28
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 周波数領域ストンリー波検層による透水性き裂と構造の推定2007

    • Author(s)
      齊藤玄敏
    • Organizer
      日本地熱学会
    • Place of Presentation
      文部科学省研究交流センター
    • Year and Date
      2007-11-28
    • Related Report
      2007 Annual Research Report
  • [Presentation] 孔内モードの周波数特性に基づく透水性き裂の計測2006

    • Author(s)
      齊藤玄敏
    • Organizer
      自動計測制御学会東北支部第232研究集会
    • Place of Presentation
      東北学院大学(仙台)
    • Year and Date
      2006-12-18
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Measurement of a permeable fracture based on frequency response of borehole mode2006

    • Author(s)
      Hiroyuki SAITO
    • Organizer
      The 232nd SEIS Tohoku blanch research meeting
    • Place of Presentation
      Sendai
    • Year and Date
      2006-12-18
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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