Fracture characterization from microseismic events at Hijiori and Ogachi fields in Japan

Shin Ito, Kazuo Hayashi, Hideshi Kaieda, Kazuhiko Tezuka

研究成果: Conference article査読

抄録

By using a two-dimensional fluid-filled crack model, fracture characterization was attempted from microseimic events observed at the Hijiori and Ogachi HDR fields, Japan. In the model, the effects of fluid viscosity, rock permeability and stiffness due to partial contact between the upper and lower surfaces of the crack were taken into account. It is possible to estimate length, aperture and interfacial stiffness of a reservoir crack; the ratio of partial contact area to crack area can be estimated from the interfacial stiffness. In the case of the Hijiori field, the characterization was successful from two events. Crack length and aperture characterized from one of the two are about 11 m and 0.7 mm, respectively. Those from the other event are about 20 m and 35 mm, respectively. In the case of the Ogachi field, the characterization was successful from only one event. Crack length and aperture are about 50 m and 10 mm, respectively. The ratio of partial contact area for both fields is estimated to be no more than 0.2%. However, there remained many events for which characterization was not successful. For such events, the mechanism responsible for crack oscillation must be different from that employed in the present model.

本文言語English
ページ(範囲)265-270
ページ数6
ジャーナルTransactions - Geothermal Resources Council
23
出版ステータスPublished - 1999 12月 1
イベントGlobal Geothermal Resources: Sustainable Energy for the Future - Reno, NV, USA
継続期間: 1999 10月 171999 10月 20

ASJC Scopus subject areas

  • 地質学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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