Fracture characterization by using resonance of penny-shaped fluid-filled crack model in Australian HDR field - Initial results

Shin Ito, Kazuo Hayashi, Hideshi Kaieda, Yasuhira Aoyagi

Research output: Contribution to journalConference articlepeer-review

Abstract

Fracture characterization was attempted using the pennyshaped fluid-filled crack model in the Australian Hot Dry Rock field. For the characterization, a seismic event observed during drilling was used. This event was a weak attenuation event and continued over 100 seconds. The characterization method, which is based on the dynamics of a penny shaped crack filled with fluid, allows the estimation of crack aperture, radius and interfacial stiffness due to partial contact between upper and lower crack surfaces. A comparison of peak frequencies detected from field data with eigen frequencies suggested by the crack modelindicates that crack radius and aperture are about 160m and 17mm. The latter result needs additional consideration since the intensity of attenuation predicted by the computed model parameters is greater than that observed in the field data.

Original languageEnglish
Pages (from-to)223-226
Number of pages4
JournalTransactions - Geothermal Resources Council
Volume28
Publication statusPublished - 2004 Dec 1
EventGeothermal Energy: The Reliable Renewable - Geothermal Resources Council 2004 Annual Meeting, GRC - Indian Wells, CA, United States
Duration: 2004 Aug 292004 Sep 1

Keywords

  • Dynamic response
  • Geothermal reservoir crack model
  • Hot Dry Rock
  • Inverse problem
  • Reservoir characterization

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

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