Poroelasticity Contributes to Hydraulic‐Stimulation Induced Pressure Changes

Autor: Florian Amann, Benoît Valley, Mohammadreza Jalali, Nathan Dutler, Hannes Krietsch, Linus Villiger, Domenico Giardini, Valentin Gischig, Joseph Doetsch
Rok vydání: 2021
Předmět:
Zdroj: Geophysical research letters : GRL 48(6), e2020GL091468 (2021). doi:10.1029/2020GL091468
Geophysical Research Letters, 48 (6)
ISSN: 1944-8007
0094-8276
Popis: 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 resolutions 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 experiments confirm that fracture fluid pressure perturbations around the injection point are not limited to the near field and can extend beyond the pressurized zone.
Geophysical Research Letters, 48 (6)
ISSN:0094-8276
ISSN:1944-8007
Databáze: OpenAIRE
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