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首页> 外文期刊>Environmental Science & Technology >Inverse Modeling of Water-Rock-CO_2 Batch Experiments: Potential Impacts on Groundwater Resources at Carbon Sequestration Sites
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Inverse Modeling of Water-Rock-CO_2 Batch Experiments: Potential Impacts on Groundwater Resources at Carbon Sequestration Sites

机译：Water-Rock-CO_2批处理实验的逆模型：碳固存站点对地下水资源的潜在影响

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摘要

This study developed a multicomponent geo- chemical model to interpret responses of water chemistry to introduction of CO_2 into six water-rock batches with sedimentary samples collected from representative potable aquifers in the Gulf Coast area. The model simulated CO_2 dissolution in groundwater, aqueous complexation, mineral reactions (dissolution/precipitation), and surface complexation on clay mineral surfaces. An inverse method was used to estimate mineral surface area, the key parameter for describing kinetic mineral reactions. Modeling results suggested that reductions in groundwater pH were more significant in the carbonate-poor aquifers than in the carbonate-rich aquifers, resulting in potential groundwater acidification. Modeled concentrations of major ions showed overall increasing trends, depending on mineralogy of the sediments, especially carbonate content. The geochemical model confirmed that mobilization of trace metals was caused likely by mineral dissolution and surface complexation on clay mineral surfaces. Although dissolved inorganic carbon and pH may be used as indicative parameters in potable aquifers, selection of geochemical parameters for CO_2 leakage detection is site-specific and a stepwise procedure may be followed. A combined study of the geochemical models with the laboratory batch experiments improves our understanding of the mechanisms that dominate responses of water chemistry to CO_2 leakage and also provides a frame of reference for designing monitoring strategy in potable aquifers.
机译：这项研究建立了一个多组分地球化学模型，以解释水化学对将CO_2引入六个水岩批次的反应，并从墨西哥湾沿岸地区的代表性饮用水层中收集了沉积样品。该模型模拟了CO_2在地下水中的溶解，水的络合，矿物反应（溶解/沉淀）和粘土矿物表面的表面络合。逆方法用于估算矿物表面积，这是描述动力学矿物反应的关键参数。模拟结果表明，贫碳酸盐含水层中地下水pH的降低比富碳酸盐含水层中地下水pH的降低更为显着，从而导致潜在的地下水酸化。模拟的主要离子浓度显示出总体上升趋势，具体取决于沉积物的矿物学，尤其是碳酸盐含量。地球化学模型证实，痕量金属的迁移可能是由矿物溶解和粘土矿物表面的表面络合引起的。尽管溶解的无机碳和pH值可以用作饮用水层中的指示性参数，但是用于CO_2泄漏检测的地球化学参数的选择是特定于地点的，可以遵循逐步的步骤。地球化学模型的研究与实验室批处理实验的结合，增进了我们对支配水化学对CO_2泄漏响应的机制的理解，也为设计饮用水层的监测策略提供了参考框架。

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  • 来源
    《Environmental Science & Technology》 |2014年第5期|2798-2806|共9页
  • 作者

    Changbing Yang; Zhenxue Dai; Katherine D. Romanak; Susan D. Hovorka; Ramon H. Trevino;

  • 作者单位

    Bureau of Economic Geology, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, United States;

    Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States;

    Bureau of Economic Geology, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, United States;

    Bureau of Economic Geology, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, United States;

    Bureau of Economic Geology, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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