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Poroelasticity Contributes to Hydraulic-Stimulation Induced Pressure Changes
Auteur(s)
Amann, F.
Jalali, M.
Villiger, L.
Krietsch, H.
Gischig, V.
Doetsch, J.
Giardini, D.
Date de parution
2021-2
In
Geophysical Research Letters
Vol.
1029
No
10
De la page
1468
A la page
1479
Revu par les pairs
1
Résumé
High-pressure fluid injections cause transient pore pressure changes over large distances, which may induce seismicity. The zone of influence for such an injection was studied at high spatial esolutions in six decameter-scaled fluid injection experiments in crystalline rock. Pore pressure time series revealed two distinct responses based on the lag time and magnitude of pressure change, namely, a near- and far-field response. The near-field response is due to pressure diffusion. In the far-field, the fast response time and decay of pressure changes are produced by effective stress changes in the anisotropic stress field. Our xperiments confirm that fracture fluid pressure perturbations around the injection point are not limited to the near field and can extend beyond the pressurized zone.
Identifiants
Type de publication
journal article
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