CO2 long-term diffusive leakage into biosphere in geological carbon storage

Qin Yi Li, Qun Chen, Xing Zhang

研究成果: Contribution to journalArticle査読

抄録

Prediction of CO2 leakage into biosphere is very important for risk assessment in geological carbon storage projects. Underground CO2 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 CO2 gradual leakage into biosphere during a long period after CO2 injection. First, the paper describes a general diffusive model with long term secondary trapping effects for CO2 fluxes from underground into biosphere. Secondly, a simplified one-dimensional model is presented and solved for the CO2 concentrations in groundwater. The results show that the groundwater CO2 concentration will reach the maximum value at about 50th year after CO2 injection and then slowly decrease due to secondary trapping effects. Moreover, the partition coefficient is the dominant parameter for predicting the groundwater CO2 concentration while the convective mass transfer coefficient plays an insignificant role.

本文言語英語
ページ(範囲)3686-3690
ページ数5
ジャーナルChinese Science Bulletin
59
28
DOI
出版ステータス出版済み - 8 1 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • 一般

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