Calcite dissolution, porosity development are strongly influenced by mixing phenomenon, fluid density and heterogeneity (variability of the hydraulic proprieties). This study presents an approach for calculating porosity change in a heterogeneous porous media during mixing of seawater and freshwater. The proposed approach is based on the Phillip’s analytical solution and is determined by five main steps: (1) Generate a random K-field, (2) Calculate the flow and transport of the heterogeneous porous media, (3) Evaluate the dispersivity coefficient results of the heterogeneity aspect, (4) Evaluate the dissolution capacity of calcite during mixing of two solutions and (5) calculate the porosity change. This approach takes into account the effect of the aquifer heterogeneity on the dispersivity and is applied to simulate the effect of calcite dissolution on the porosity development in a heterogeneous idealized aquifer during seawater intrusion. Results presented in this work are preliminary to assess the effect of heterogeneity on the geochemical reaction during mixing.

中文翻译：

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海水和淡水混合过程中非均质和各向同性石灰岩沿海含水层的孔隙度变化

方解石溶解、孔隙度发展受到混合现象、流体密度和非均质性（水力特性的可变性）的强烈影响。本研究提出了一种计算海水和淡水混合过程中非均质多孔介质孔隙度变化的方法。所提出的方法基于 Phillip 解析解，由五个主要步骤确定：(1) 生成随机 K 场，(2) 计算非均质多孔介质的流动和传输，(3) 评估分散系数结果在非均质性方面，(4) 评估两种溶液混合过程中方解石的溶解能力和 (5) 计算孔隙率变化。该方法考虑了含水层非均质性对分散性的影响，并应用于模拟海水入侵期间方解石溶解对非均质理想化含水层孔隙度发展的影响。这项工作中提出的结果是评估混合过程中非均质性对地球化学反应的影响的初步结果。