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oa Downhole Seismic Monitoring of a Small-Scale CO2 Injection: First Phase of CO2CRC Otway Stage 4
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, World CCUS Conference 2025, Sep 2025, Volume 2025, p.1 - 5
Abstract
The CO2CRC Otway Project in Victoria, Australia, has progressed to Stage 4, building on previous research into carbon capture and storage (CCS). This phase involves injecting 10 kilotonnes of CO2 into a reservoir approximately 50 metres above the Stage 3 zone. Advanced seismic monitoring methods, including downhole distributed acoustic sensing (DAS), surface orbital vibrators (SOVs), and 4D vertical seismic profiling (VSP), are used to track the CO2 plume.
A network of fibre-optic cables installed in six wells enables continuous data collection, generating around 6 terabytes daily. The first monitor survey (M9) in February 2025 maintained 97% of the previous survey’s coverage, despite some data gaps due to land-use changes.
This phase enhances the understanding of CO2 plume dynamics and reservoir behaviour through active and passive seismic monitoring. The next injection, scheduled for late 2025 to early 2026, will provide further insights into optimising CCS monitoring techniques and ensuring effective long-term CO2 storage solutions.
