In-situ stress constraints on the focal mechanisms of induced seismicity

Y. Mukuhira, T. Ito, M. C. Fehler, M. Naoi, H. Moriya, H. Asanuma, M. O. Häring

研究成果: Conference contribution

抄録

Microseismic monitoring is a crucial technique for successful hydraulic stimulation/fracking for various types of subsurface development. Knowledge about the geometry of the fracture is also essential for a better understanding of many phenomena in reservoirs. Fracture orientation can be estimated by the seismological method under very good monitoring situation. However, we often face difficulty in constraining the focal mechanism of microseismicity from first motion due to the small number of stations. We develop a method to constrain the range of focal mechanisms solutions by introducing in-situ stress information. We can reject candidate focal mechanisms which are consistent with first motion but not consistent with in-situ stress by checking two conditions. 1) consistency between shear vector estimated from in-situ stress and the rake from first motion analysis, 2) state of stress of the fracture and its stability considering the injection pressure. We use field data to demonstrate that this method can significantly constrain the range of focal mechanisms.

本文言語English
ホスト出版物のタイトルRock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
編集者Sergio A.B. da Fontoura, Ricardo José Rocca, José Félix Pavón Mendoza
出版社CRC Press/Balkema
ページ1380-1387
ページ数8
ISBN(印刷版)9780367422844
出版ステータスPublished - 2020
イベント14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019 - Foz do Iguaçu, Brazil
継続期間: 2019 9月 132019 9月 18

出版物シリーズ

名前Rock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019

Conference

Conference14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
国/地域Brazil
CityFoz do Iguaçu
Period19/9/1319/9/18

ASJC Scopus subject areas

  • 地質学
  • 地盤工学および土木地質学
  • 土木構造工学

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