Effect of dissolved H₂SO₄ on the interaction between CO₂-rich brine solutions and limestone, sandstone and marl

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• 作者：E.M. Thaysen^a ; ^b ; ^{eikethaysen@gmail.com} ; Josep M. Soler^a ; ^b ; Marijn Boone^c ; ^d ; Veerle Cnudde^c ; Jordi Cama^a ; ^b
• 关键词：CO2 storage ; Impurities ; SO2- and CO2-water-rock interactions ; Reactive transport modeling ; Micro-CT ; SEM ; XRD
• 刊名：Chemical Geology
• 出版年：2017
• 出版时间：5 February 2017
• 年：2017
• 卷：450
• 期：Complete
• 页码：31-43
• 全文大小：2048 K
• 卷排序：450

文摘

H2SO4 addition lowered the injected brine pH by ~ 1.5 pH units with respect to the H2SO4-free brine (pH 3.6). Total porosities in limestone, sandstone and marl in H2SO4-rich brine were 6–250% higher than in H2SO4-free brine. Near-column inlet porosities in H2SO4-rich brine were 1–250% higher than in H2SO4-free brine, depending on rock type. Calcite dissolution rates were increased by 27–48% in H2SO4-rich brine, depending on rock type. Gypsum precipitation rates were increased by 25–75% in H2SO4-rich brine, depending on rock type.