Comprehensive evaluation of the initial rock stress carried out as part of a 2000m all core borehole investigation

T. Nayuki, K. Ando, K. Onishi, N. Nishizaka, Y. Ishikawa, Y. Ohno, S. Kato, T. Ito

研究成果: Conference contribution

抄録

In the field of tectonic stress measurement, it is generally acknowledged that measuring the initial stress with high accuracy is difficult. We think the best approach to evaluate the initial rock stress is to carry out tests using multiple stress measurement techniques, to organize their mutual relationship and after reviewing the results, to performing a comprehensive evaluation, rather than reaching a conclusion based on a single measurement. A hydraulic fracturing test has been carried out in-situ. Using the retrieved core, the DSCA method and a new technique that uses the Diametrical Core Deformation Analysis (DCDA) has been carried out. Furthermore, using BHTV measurements, the breakout of the borehole has been confirmed and its occurrence has been interpreted. In this study, the maximum and minimum principal stress, as well as the direction of the maximum principal stress in the horizontal plane, has been estimated based on a comprehensive evaluation of the above mentioned results. Based on the each tests and the comprehensive evaluation, the direction of the maximum principal stress in the horizontal plane is estimated to be 85 degrees, the magnitude of the maximum principal stress at 1,700m depth to be between approximately 37 and 42MPa, and the magnitude of the minimum principal stress to be between approximately 34 and 38MPa. These results are consistent with the regional stress field derived from focal mechanism analysis.

本文言語English
ホスト出版物のタイトルISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
編集者 Kaneko, Kodama, Shimizu
出版社International Society for Rock Mechanics
ページ2215-2223
ページ数9
ISBN(電子版)9784907430030
出版ステータスPublished - 2014
イベント8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, Japan
継続期間: 2014 10月 142014 10月 16

出版物シリーズ

名前ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014

Other

Other8th Asian Rock Mechanics Symposium, ARMS 2014
国/地域Japan
CitySapporo
Period14/10/1414/10/16

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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