CO2 Leakage Identification in Geosequestration Based on Real Time Correlation Analysis Between Atmospheric O2 and CO2

The paper describes a method for monitoring CO2 leakage in geological carbon dioxide sequestration. A real time monitoring parameter, apparent leakage flux （ALF）, is presented to monitor abnormal CO2 leakage, which can be calculated by atmospheric CO2 and O2 data. The computation shows that all ALF...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 22; no. 6; pp. 634 - 642
Main Author 马登龙 邓建强 张早校
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2014
Subjects
carbon storage
CO2 monitor
CO2浓度
correlation analysis
gas leakage
O2/CO2 exchange
二氧化碳
地质
大气
实时分析
无泄漏
线性扰动
鉴定
carbon storage
correlation analysis
CO2 monitor
gas leakage
O2/CO2 exchange
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Summary:The paper describes a method for monitoring CO2 leakage in geological carbon dioxide sequestration. A real time monitoring parameter, apparent leakage flux （ALF）, is presented to monitor abnormal CO2 leakage, which can be calculated by atmospheric CO2 and O2 data. The computation shows that all ALF values are close to zero-line without the leakage. With a step change or linear perturbation of concentration to the initial CO2 concen-tration data with no leakage, ALF will deviate from background line. Perturbation tests prove that ALF method is sensitive to linear perturbation but insensitive to step change of concentration. An improved method is proposed based on real time analysis of surplus CO2 concentration in least square regression process, called apparent leakage flux from surplus analysis （ALFs）, which is sensitive to both step perturbation and linear perturbations of concen-tration. ALF is capable of detecting concentration increase when the leakage occurs while ALFs is useful in all pe-riods of leakage. Both ALF and ALFs are potential approaches to monitor CO2 leakage in geosequestration project.
Bibliography:11-3270/TQ
CO2 monitor, carbon storage, gas leakage, O2/CO2 exchange, correlation analyysis
The paper describes a method for monitoring CO2 leakage in geological carbon dioxide sequestration. A real time monitoring parameter, apparent leakage flux （ALF）, is presented to monitor abnormal CO2 leakage, which can be calculated by atmospheric CO2 and O2 data. The computation shows that all ALF values are close to zero-line without the leakage. With a step change or linear perturbation of concentration to the initial CO2 concen-tration data with no leakage, ALF will deviate from background line. Perturbation tests prove that ALF method is sensitive to linear perturbation but insensitive to step change of concentration. An improved method is proposed based on real time analysis of surplus CO2 concentration in least square regression process, called apparent leakage flux from surplus analysis （ALFs）, which is sensitive to both step perturbation and linear perturbations of concen-tration. ALF is capable of detecting concentration increase when the leakage occurs while ALFs is useful in all pe-riods of leakage. Both ALF and ALFs are potential approaches to monitor CO2 leakage in geosequestration project.
MA Denglong , DENG Jianqiang , ZHANG Zaoxiao （1 State Key Laboratory of Multiphase Flow in Power Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China 2 School of Chemical Engineering and Technology, Xi＇an Jiaotong University, Xi＇an 710049, China）
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(14)60094-X