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首页> 外文期刊>Environmental Science & Technology >Dissolved CO_2 Increases Breakthrough Porosity in Natural Porous Materials
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Dissolved CO_2 Increases Breakthrough Porosity in Natural Porous Materials

机译：溶解的CO_2增加了天然多孔材料中的突破性孔隙

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摘要

When reactive fluids flow through a dissolving porous medium, conductive channels form, leading to fluid breakthrough. This phenomenon is caused by the reactive infiltration instability and is important in geologic carbon storage where the dissolution of CO_2 in flowing water increases fluid acidity. Using numerical simulations with high resolution digital models of North Sea chalk, we show that the breakthrough porosity is an important indicator of dissolution pattern. Dissolution patterns reflect the balance between the demand and supply of cumulative surface. The demand is determined by the reactive fluid composition while the supply relies on the flow field and the rock's microstructure. We tested three model scenarios and found that aqueous CO_2 dissolves porous media homogeneously, leading to large breakthrough porosity. In contrast, solutions without CO_2 develop elongated convective channels known as wormholes, with low breakthrough porosity. These different patterns are explained by the different apparent solubility of calcite in free drift systems. Our results indicate that CO_2 increases the reactive subvolume of porous media and reduces the amount of solid residual before reactive fluid can be fully channelized. Consequently, dissolved CO_2 may enhance contaminant mobilization near injection wellbores, undermine the mechanical sustainability of formation rocks and increase the likelihood of buoyance driven leakage through carbonate rich caprocks.
机译：当反应性流体流过溶解的多孔介质时，形成导电通道，导致流体突破。这种现象是由反应性渗透的不稳定性引起的，并且在地质碳存储中很重要，在二氧化碳存储中，CO_2在流动水中的溶解会增加流体的酸度。使用具有北海白垩的高分辨率数字模型的数值模拟，我们表明突破的孔隙度是溶解模式的重要指标。溶解模式反映了累积表面的供需之间的平衡。需求取决于反应流体的组成，而供应则取决于流场和岩石的微观结构。我们测试了三种模型场景，发现含水的CO_2均匀地溶解了多孔介质，从而导致较大的突破孔隙度。相比之下，不含CO_2的溶液会形成细长的对流通道，称为虫孔，穿透孔隙率低。方解石在自由漂移系统中的不同表观溶解度解释了这些不同的模式。我们的结果表明，CO_2可以增加多孔介质的反应体积，并减少反应流体可以完全通道化之前的固体残留量。因此，溶解的CO_2可能会增强注入井眼附近的污染物动员，破坏地层岩石的机械可持续性，并增加通过浮力驱动通过富碳酸盐岩层泄漏的可能性。

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  • 来源
    《Environmental Science & Technology》 |2017年第14期|7982-7991|共10页
  • 作者

    Yang Y.; Bruns Stefan; Stipp Susan Louise Svane; Sørensen Henning Osholm;

  • 作者单位

    Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark;

    Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark;

    Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark;

    Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, Denmark;

  • 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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