Abstract In previous work, the impact of lithological variations on the transport properties of the Boom Clay and EigenbiIzen Sands and their correlation was studied. However, some questions such as understanding the variability of the geometric factor with the size of the diffusing molecule remain. Therefore, linking transport properties to the microstructure was an essential step in solving remaining questions. A detailed petrographical study, including medical CT, micro-CT and light microscopy of thin sections was performed on the same sample set. Results indicated clear differences in the microstructure of the Boom Clay and Eigenbilzen Sands. Boom Clay samples were dominated by a clay matrix with a homogeneous distribution of quartz grains. Pores were small and mainly located in the clay matrix. In contrast, samples of the Eigenbilzen Sands showed large amounts of quartz, heterogeneous distribution of the clay phase and interparticle porosity between quartz grains. Porosity was mainly located in between the quartz grains, only a small fraction was located in the clay matrix. Larger pores could be linked to increased hydraulic conductivity and diffusivity of dissolved gases in samples of the Eigenbilzen Sands. Results of CT, micro-CT and light microscopy were complementary and provided a global view on the pore structure, supported by the pore size distribution derived from N2-desorption and MIP measurements.

中文翻译：

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将岩石学和岩石物理特性与输运特征联系起来：来自 Boom Clay 和 Eigenbilzen Sands 的案例

摘要 在以往的工作中，研究了岩性变化对Boom Clay 和EigenbiIzen Sands 输运性质的影响及其相关性。然而，一些问题仍然存在，例如理解几何因子随扩散分子大小的变化。因此，将传输特性与微观结构联系起来是解决剩余问题的必要步骤。对同一样本集进行了详细的岩相研究，包括医学 CT、显微 CT 和薄片光学显微镜检查。结果表明 Boom Clay 和 Eigenbilzen Sands 的微观结构存在明显差异。Boom Clay 样品以具有均匀分布的石英颗粒的粘土基质为主。孔隙很小，主要位于粘土基质中。相比之下，Eigenbilzen Sands 的样品显示出大量的石英、粘土相的不均匀分布以及石英颗粒之间的颗粒间孔隙度。孔隙主要位于石英颗粒之间，只有一小部分位于粘土基质中。较大的孔隙可能与 Eigenbilzen Sands 样品中溶解气体的水力传导率和扩散率增加有关。CT、显微 CT 和光学显微镜的结果是互补的，并提供了孔结构的全局视图，由 N2 解吸和 MIP 测量得出的孔径分布支持。较大的孔隙可能与 Eigenbilzen Sands 样品中溶解气体的水力传导率和扩散率增加有关。CT、显微 CT 和光学显微镜的结果是互补的，并提供了孔结构的全局视图，由 N2 解吸和 MIP 测量得出的孔径分布支持。较大的孔隙可能与 Eigenbilzen Sands 样品中溶解气体的水力传导率和扩散率增加有关。CT、显微 CT 和光学显微镜的结果是互补的，并提供了孔结构的全局视图，由 N2 解吸和 MIP 测量得出的孔径分布支持。