Factors Affecting CO2 Storage Capacity and Efficiency with Water Withdrawal in Shallow Saline Aquifers
Carbon sequestration in shallow aquifers can be facilitated by water withdrawal. The factors that optimize the injection/withdrawal balance to minimize potential environmental impacts have been studied, including reservoir size, well pattern, injection rate, reservoir heterogeneity, anisotropy ratio, and permeability sequence. The effects of these factors on CO2 storage capacity and efficiency were studied using a compositional simulator Computer Modeling Group-General Equation of State Model, which modeled features including residual gas trapping, CO2 solubility, and mineralization reactions. Two terms, storage efficiency and CO2 relative breakthrough time, were introduced to better describe the problem. The simulation results show that simultaneous water withdrawal during CO2 injection greatly improves CO2 storage capacity and efficiency. A certain degree of heterogeneity or anisotropy benefits CO2 storage. A high injection rate favors storage capacity, but reduces the storage efficiency and CO2 breakthrough time, which in turn limits the total amount of CO2 injected.
F. Yang et al., "Factors Affecting CO2 Storage Capacity and Efficiency with Water Withdrawal in Shallow Saline Aquifers," Environmental Earth Sciences, vol. 71, no. 1, pp. 267-275, Elsevier B.V., Jan 2014.
The definitive version is available at http://dx.doi.org/10.1007/s12665-013-2430-z
Geosciences and Geological and Petroleum Engineering
National Natural Science Foundation of China
Keywords and Phrases
CO2 sequestration; Reservoir heterogeneity; Shallow aquifer; Storage capacity; Storage efficiency; Water withdrawal; Anisotropy; Aquifers; Efficiency; Environmental impact; Equations of state; Hydrogeology; Petroleum reservoir engineering; Water injection; Carbon dioxide
International Standard Serial Number (ISSN)
Article - Journal
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