Monitoring dissolved CO2 in groundwater for CO2 leakage detection in a shallow aquifer

Abstract

This study presents demonstration of monitoring dissolved CO 2 using fiber-optic CO 2 sensors for CO 2 leakage detection through a small-scale field test. Theoretical analysis of CO 2 leakage into a potable aquifer system with and without the presence of carbonates in the aquifer sediments suggests that dissolved CO 2 is a good indicator of CO 2 leakage. CO 2 leakage was simulated through two pulse-like CO 2 releases into a single testing well which were monitored with a fiber-optic CO 2 sensor and periodic groundwater sampling. Field results show that the changes in dissolved CO 2 concentrations were detected by the CO 2 sensor, confirming that it is possible to use chemical sensors for real-time in situ leakage detection at a geological carbon sequestration site.

Real-Time Monitoring of Gas-Phase and Dissolved CO2 Using a Mixed-Matrix Composite Integrated Fiber Optic Sensor for Carbon Storage Application

“…Carbon capture and storage as a supercritical fluid in deep geological reservoirs is a key technology to reduce carbon dioxide (CO 2 ) emissions from industrial processes. , For geological CO 2 storage to be safe, reliable, and robust strategies for CO 2 leakage detection, quantification and management are crucial. , One such strategy is the monitoring of solution-phase chemistry in geological formations. − Therefore, techniques for long-range and real-time monitoring of gas-phase and dissolved CO 2 leakage detection are required.…”