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Abstract

Summary

Characterising the risk of vertical gas migration through fault zones is essential for Carbon Capture and Storage (CCS) projects and requires appropriate monitoring strategies. Previous studies have demonstrated that the time-lapse analysis of ocean-generated Rayleigh-wave amplitudes recorded by downhole distributed acoustic sensing (DAS) could help detect changes related to CO2 injection in thin subsurface layers. In this study, we investigate the potential of this methodology to detect CO2 leakage. To do so, we analyse passive seismic data recorded using downhole DAS during the injection of a small amount of gaseous CO2 near a shallow fault zone. Results reveal amplitude anomalies close to the injection interval shortly after the start of the injection. One day after the start of the injection, amplitude anomalies are seen further up the well, which could be related to the migration of the CO2 plume up along the fault. These results highlight the potential of this methodology to provide a near-real-time monitoring technique to augment current CCS monitoring technologies.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202510560
2025-06-02
2026-02-15

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References

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/content/papers/10.3997/2214-4609.202510560
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Monitoring of a Shallow CO2 Controlled Release Experiment Using Time-lapse Analysis of Downhole DAS Rayleigh Waves
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202510560
/content/papers/10.3997/2214-4609.202510560
/content/papers/10.3997/2214-4609.202510560
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