TY - GEN
T1 - In-situ stress constraints on the focal mechanisms of induced seismicity
AU - Mukuhira, Y.
AU - Ito, T.
AU - Fehler, M. C.
AU - Naoi, M.
AU - Moriya, H.
AU - Asanuma, H.
AU - Häring, M. O.
N1 - Funding Information:
data sets and for permission to publish the results. This study is supported by JSPS KAKENHI Grant Number 18K14167 and ERL, MIT.
Funding Information:
We thank Geo Explorers Ltd. and Geo-Energie Suisse AG for providing the microseismic wave data sets and for permission to publish the results. This study is supported by JSPS KAKENHI Grant Number 18K14167 and ERL, MIT.
Publisher Copyright:
© 2020 ISRM.
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:85084675862
SN - 9780367422844
T3 - Rock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
SP - 1380
EP - 1387
BT - Rock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
A2 - da Fontoura, Sergio A.B.
A2 - Rocca, Ricardo José
A2 - Mendoza, José Félix Pavón
PB - CRC Press/Balkema
T2 - 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
Y2 - 13 September 2019 through 18 September 2019
ER -