1. CO long-term diffusive leakage into biosphere in geological carbon storage.
- Author
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Li, Qin-Yi, Chen, Qun, and Zhang, Xing
- Subjects
CARBON dioxide ,GEOLOGICAL carbon sequestration ,DIFFUSION ,BIOSPHERE ,ENVIRONMENTAL risk assessment - Abstract
Prediction of CO leakage into biosphere is very important for risk assessment in geological carbon storage projects. Underground CO can be transported into biosphere through short term leakage due to fractures of wellbores or cap rocks, which has been extensively investigated, and long term leakage due to diffusion, which has few relevant studies. This paper presents a diffusive model for CO gradual leakage into biosphere during a long period after CO injection. First, the paper describes a general diffusive model with long term secondary trapping effects for CO fluxes from underground into biosphere. Secondly, a simplified one-dimensional model is presented and solved for the CO concentrations in groundwater. The results show that the groundwater CO concentration will reach the maximum value at about 50th year after CO injection and then slowly decrease due to secondary trapping effects. Moreover, the partition coefficient is the dominant parameter for predicting the groundwater CO concentration while the convective mass transfer coefficient plays an insignificant role. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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