Reactivity of Mount Simon Sandstone and the Eau Claire Shale Under CO2 Storage Conditions

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• 作者：Susan A. Carroll ; Walt W. McNab ; Zurong Dai ; Sharon C. Torres
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：January 2, 2013
• 年：2013
• 卷：47
• 期：1
• 页码：252-261
• 全文大小：554K
• 年卷期：v.47,no.1(January 2, 2013)
• ISSN：1520-5851

文摘

The Mount Simon sandstone and Eau Claire shale formations are target storage and cap rock formations for the Illinois Basin鈥揇ecatur Geologic Carbon Sequestration Project. We reacted rock samples with brine and supercritical CO₂ at 51 掳C and 19.5 MPa to access the reactivity of these formations at storage conditions and to address the applicability of using published kinetic and thermodynamic constants to predict geochemical alteration that may occur during storage by quantifying parameter uncertainty against experimental data. Incongruent dissolution of iron-rich clays and formation of secondary clays and amorphous silica will dominate geochemical alterations at this CO₂ storage site in CO₂-rich brines. The surrogate iron-rich clay in the model required significant adjustments to its thermodynamic constants and inclusion of incongruent reaction terms to capture the change in solution composition under acid CO₂ conditions. This result emphasizes the need for experiments that constrain the conceptual geochemical model, calibrate mean parameter values, and quantify parameter uncertainty in reactive-transport simulations that will be used to estimate long-term CO₂ trapping mechanisms and changes in porosity and permeability.