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Abstract
Despite public concerns, only a few CO2 injections into saline aquifers have reported microseismicity. We analyze passive seismic monitoring of a small (15,000 tonnes and 0.15 MPa pressure) injection of supercritical CO2-rich mixture for Stage 2C of the CO2CRC Otway Project (Victoria, Australia), which induced 19 detectable events with maximum moment magnitude MW-0.5. The locations and dynamic parameters of the triggered events indicate a reactivation of a small fault patch where CO2 flowed through the fault. Time-lapse seismic images of the plume and reservoir simulations show that the reactivation occurred when the CO2 plume reached this fault. This might be indicative of a fault weakening by the plume that enabled subsequent reactivation by pressure variations. Our observations suggest that a leakage from a commercial-scale storage may trigger felt seismicity in the overburden without strong overpressure, thus, the de-risking workflows should involve a detailed study of small faults.
Original language | English |
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Article number | e2022GL098062 |
Number of pages | 12 |
Journal | Geophysical Research Letters |
Volume | 49 |
Issue number | 12 |
DOIs | |
Publication status | Published - 28 Jun 2022 |
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Dive into the research topics of 'A Small CO2 Leakage May Induce Seismicity on a Sub-Seismic Fault in a Good-Porosity Clastic Saline Aquifer'. Together they form a unique fingerprint.Projects
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Constricted hydraulic fracture opening
Dyskin, A. (Investigator 01), Pasternak, E. (Investigator 02), Gurevich, B. (Investigator 03), Lebedev, M. (Investigator 04), Bunger, A. (Investigator 05) & Shapiro, S. (Investigator 06)
ARC Australian Research Council
6/06/19 → 31/12/24
Project: Research