Abstract
The paper presents a method for monitoring CO2 leakage in geological carbon dioxide sequestration. The unsteady state dispersion of leakage CO2 from geosequestration simulation results showed that the ensemble trend of elevated concentration caused by CO2 leakage can be viewed as a concentration step change perturbation to the background variation and the initial stage of dispersion process is an increasing variation. The correlation between O2 and CO2 variation is well linear if there is no leakage. The external linear perturbation decreases the correlation coefficient. Moreover, too large step change concentration will also reduce the average correlation coefficient. Therefore, online correlation analysis between O2 and CO2 in atmosphere is useful to distinguish the leakage CO2 from complex background variation especially at the beginning of leakage occurring.
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