Quantitative assessment of soil CO 2 concentration and stable carbon isotope for leakage detection at geological carbon sequestration sites

Changbing Yang, Keith Jamison, Lianqing Xue, Zhenxue Dai, Susan Hovorka, Leif Fredin and Ramón Treviño

Greenhouse Gases: Science and Technology, 2017, vol. 7, issue 4, 680-691

Abstract: This study presents a quantitative method to evaluate CO 2 concentration ([CO 2 ]) and stable carbon isotope ratio (δ-super-13C) as indicators for leakage detection at a geological carbon sequestration site by combining use of field release tests and a numerical modeling approach. A numerical model was developed to simulate CO 2 dynamics by considering diffusion, dissolution in soil water, and soil respiration. The numerical model fits the background dynamics of [CO 2 ] (360 to 550 ppm) and δ-super-13C (‐16‰ to ‐6‰) well and reproduces fairly the overall trend observed during the CO 2 release test. The model was further applied to assess detection probability (DP) of [CO 2 ] and δ-super-13C for leakage detection in terms of various factors, such as CO 2 leakage rate, background variations, δ-super-13C of the CO 2 leaked, and the threshold value of signal‐to‐noise ratio. Modeling results suggest that δ-super-13C may have a higher DP than [CO 2 ]. This study also shows that DP of δ-super-13C for the IEA Weyburn project is close to 0, implying δ-super-13C is inappropriate to be an indicator for CO 2 leakage at the site. The quantitative method developed can also be used to design a monitoring plan or strategy in a near‐surface environment for geological carbon sequestration. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:7:y:2017:i:4:p:680-691

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