TY - JOUR
T1 - CO2 leakage detection in the near-surface above natural CO2-rich water aquifer using soil gas monitoring
AU - Kim, Jihyun
AU - Yu, Soonyoung
AU - Yun, Seong Taek
AU - Kim, Kyoung Ho
AU - Kim, Ji Hoon
AU - Shinn, Young Jae
AU - Chae, Gitak
N1 - Funding Information:
This research was supported by the fundamental research project of KIGAM (Korea Institute of Geoscience and Mineral resources) and was partially supported by Korea Ministry of Environment (MOE) as K-COSEM (Korea CO 2 Storage Environmental Management) Research Program . The authors acknowledge diligent field works by Min-Zi Kim and Hyunseong Song. The authors also would like to thank Youn-Young Jung, Yong Hwa Oh, Kil Yong Lee, and Stephen Taylor for their helps on groundwater sampling and soil gas analysis.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/9
Y1 - 2019/9
N2 - Conventional soil gas monitoring methods were applied above a natural low-level CO2 reservoir to locate natural CO2 leakage and assess effectiveness in monitoring geological carbon storage sites. The concentrations of the soil gas (N2, O2, and CO2) and carbon-13 isotopes of soil CO2 (δ13CCO2) were determined for ninety-four soil gas samples that were collected at a depth of ∼60 cm. The CO2 flux was also measured at the same sampling locations. The 93 soil gas samples were divided into two groups: Group A with low soil CO2 concentrations and high δ13CCO2, which was influenced by the atmospheric air, and Group B with high soil CO2 concentrations and low δ13CCO2, which originated from microbial processes. Sample M17, which was close to a CO2-rich water well, had an exceptionally high soil CO2 (36.0% v/v), δ13CCO2 (-5.7‰), and flux (546.2 g/m2/d), indicating geogenic CO2 inflow to the soil layer and discharge through the surface. This study shows that conventional soil gas monitoring methods are useful for locating CO2 leakage. A dense grid soil CO2 sampling near wells and periodic investigations are crucial for further understanding of the CO2 flow paths in the soil layer.
AB - Conventional soil gas monitoring methods were applied above a natural low-level CO2 reservoir to locate natural CO2 leakage and assess effectiveness in monitoring geological carbon storage sites. The concentrations of the soil gas (N2, O2, and CO2) and carbon-13 isotopes of soil CO2 (δ13CCO2) were determined for ninety-four soil gas samples that were collected at a depth of ∼60 cm. The CO2 flux was also measured at the same sampling locations. The 93 soil gas samples were divided into two groups: Group A with low soil CO2 concentrations and high δ13CCO2, which was influenced by the atmospheric air, and Group B with high soil CO2 concentrations and low δ13CCO2, which originated from microbial processes. Sample M17, which was close to a CO2-rich water well, had an exceptionally high soil CO2 (36.0% v/v), δ13CCO2 (-5.7‰), and flux (546.2 g/m2/d), indicating geogenic CO2 inflow to the soil layer and discharge through the surface. This study shows that conventional soil gas monitoring methods are useful for locating CO2 leakage. A dense grid soil CO2 sampling near wells and periodic investigations are crucial for further understanding of the CO2 flow paths in the soil layer.
KW - CO leakage
KW - Carbon-13 isotope
KW - Geological CO storage
KW - Natural analogue
KW - Near-surface geochemical monitoring
UR - http://www.scopus.com/inward/record.url?scp=85067871247&partnerID=8YFLogxK
U2 - 10.1016/j.ijggc.2019.06.015
DO - 10.1016/j.ijggc.2019.06.015
M3 - Article
AN - SCOPUS:85067871247
SN - 1750-5836
VL - 88
SP - 261
EP - 271
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
ER -