-
oa Monitoring Shallow CO2 Release with Time-lapse VSP and DAS Seismic Techniques
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 4th EAGE Workshop on Fiber Optic Sensing for Energy Applications, Aug 2024, Volume 2024, p.1 - 3
Abstract
A controlled CO2 release test involving the injection of 38 tonnes of CO2 into a fault zone between 336–342 m depth over four days was conducted successfully at CSIRO In-Situ Laboratory, Western Australia, in February 2019. The experiment aimed to assess the detection and monitoring of shallow CO2 accumulations. Seismic monitoring, employing offset vertical seismic profiling (VSP) and distributed acoustic sensing (DAS), conducted eight consecutive surveys during CO2 injection.
To verify complete CO2 release, a ninth VSP survey resembling previous surveys was conducted in March 2023. However, modifications in DAS system acquisition parameters for the last dataset posed challenges during seismic time-lapse data processing.
The study showcases a successful time-lapse processing workflow and highlights the reliability of a monitoring system with fiber optic sensors, enabling detection and observation of injected CO2 and its complete release or dissolution over time.
