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2000 Fiscal Year Final Research Report Summary

Development of a measurement techniques of coherent waves by a downhole double three compnent seismic detector

Research Project

Project/Area Number 11555265
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section展開研究
Research Field 資源開発工学
Research InstitutionTohoku University

Principal Investigator

ASANUMA Hiroshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (50250717)

Co-Investigator(Kenkyū-buntansha) TATENO Masayuki  JMC Geo-E Corp.Group Leader, 探査部・物理グループ, 課長(研究職)
MORIYA Hirokazu  Graduate School of Tohoku University, Faculty of Engineering, Research Associate, 大学院・工学研究科, 助手 (60261591)
NIITSUMA Hiroaki  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90108473)
Project Period (FY) 1999 – 2000
KeywordsF-T Coherence / Downhole 3C detector / AE reflection method / SWD / Superresolution mapping / Crosshole measurement
Research Abstract

1.Application to super resolution mapping : We investigated a method to use crossvariance matrix from upper and lower detector in frequency domain for precise detection of polarization of P wave. It has been revealed that effect of uncorrelated noise is effectively suppressed by this method.
2.Application to AE reflection method : Software for three dimensional TFC method, where coherency of hodogrmas is evaluated, was developed. Reflectors at Kakkonda geothermal field was successfully imaged by this method.
3.Application to drill bit reflection method : The TFC method was used in the analysis existing data sets and the effectiveness of this method was investigated.
4.Application to cross hole measurement : Field experiments to detect coherent waves from pressurized fracture were made in Tohoku University Higashi Hachimantai Field, Iwate. Some coherent component appeared in the coherence index associated with water injection, although interpretation of origin and characteristics of thie wave has not done yet.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] H.Asanuma,J.Takayama and H.Niitsuma: "Discrimination of coherent waves by a time-frequency representation of 3D hodogram and application to microseismic reflection method"SEG Expanded Abstracts. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi Asanuma,Hakusei Liu,Hiroaki Niitsuma,and Roy Baria: "Comparison of reflection image by the traixial drill-bit VSP at Soultz HDR field with geological information"Transactions GRC. 121-124 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroshi Asanuma,Hakusei Liu,Hiroaki Niitsuma,and Roy Baria: "Characterization of HDR reservoir by seismic signal while drilling"Proc.WGC 2000. (in CDROM). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Asanuma, J.Takayama and H.Niitsuma: "Discrimination of coherent waves by a time-frequency representation of 3D hodogram and application to microseismic reflection method"SEG Expanded Abstracts. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Asanuma, Hakusei Liu, Hiroaki Niitsuma, and Roy Baria: "Comparison of reflection image by the traixial drill-bit VSP at Soultz HDR field with geological information"Transactions GRC. 121-124 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Asanuma, Hakusei Liu, Horiaki Niitsuma, and Roy Baria: "Characterization of HDR reservoir by seismic signal while drilling"Proc.WGC2000. (in CD-ROM). (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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