Abstract
Abstract This study presents demonstration of monitoring dissolved CO2 using fiber-optic CO2 sensors for CO2 leakage detection through a small-scale field test. Theoretical analysis of CO2 leakage into a potable aquifer system with and without the presence of carbonates in the aquifer sediments suggests that dissolved CO2 is a good indicator of CO2 leakage. CO2 leakage was simulated through two pulse-like CO2 releases into a single testing well which were monitored with a fiber-optic CO2 sensor and periodic groundwater sampling. Field results show that the changes in dissolved CO2 concentrations were detected by the CO2 sensor, confirming that it is possible to use chemical sensors for real-time in situ leakage detection at a geological carbon sequestration site.
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