This study was conducted to detect and characterize potential CO2 leakage from the K-COSEM shallow CO2 release experiment. The study site was established in Eumseong, South Korea, and consisted of five zones divided into two lines (east and west). Approximately 1.8 t CO2 was injected from the perforated release well at Zones 1–4 from June 1–30, 2016. CO2 fluxes varied due to the uneven permeability of soil, and CO2 leakage at the surface was detected within small area (<10 m across). In-soil CO2 concentrations within 5 m from the well were also significantly higher than those measured at 10 m from the well. These results confirmed that the spatial distribution of in-soil CO2 is strongly affected by soil properties and atmospheric pressure effects. Non-linear regression and CO2:O2 ratio analyses were conducted to determine whether there is a CO2 leakage. Even though maximum CO2 concentrations at some leak points were as low as the background concentration, CO2 concentration clearly increased. The CO2:O2 ratios from the CO2 release experiments were completely different from the ratios associated with the biological reaction. Those methods seem to be practical use as indicators of CO2 leakage detection.
- CO leakage
- Environmental impact assessment
- Monitoring technique
ASJC Scopus subject areas
- Management, Monitoring, Policy and Law
- Industrial and Manufacturing Engineering