Mineral carbonation in basaltic rock provides a permanent storage solution for the mitigation of anthropogenic CO₂ emissions in the atmosphere. 3D X-ray micro-CT (XCT) image analysis is applied to a core sample from the main basaltic reservoir of the CarbFix site in Iceland, which obtained a connected porosity of 2.05–8.76%, a reactive surface area of 0.10–0.33 mm⁻¹ and a larger vertical permeability (2.07 × 10⁻¹⁰ m²) compared to horizontal permeability (5.10 × 10⁻¹¹ m²). The calculations suggest a CO₂ storage capacity of 0.33 Gigatonnes at the CarbFix pilot site. The XCT results were compared to those obtained from a hydromechanical test applied to the same sample, during which permeability, electrical resistivity and volumetric deformation were measured under realistic reservoir pressure conditions. It was found that permeability is highly stress sensitive, dropping by two orders of magnitude for a −0.02% volumetric deformation change, equivalent to a mean pore diameter reduction of 5 μm. This pore contraction was insufficient to explain such a permeability reduction according to the XCT analysis, unless combined with the effects of clay swelling and secondary mineral pore clogging. The findings provide important benchmark data for the future upscaling and optimisation of CO₂ storage in basalt formations.

玄武岩中的矿物碳化为缓解大气中人为的CO ₂排放提供了永久的存储解决方案。将3D X射线显微CT（XCT）图像分析应用于来自冰岛CarbFix站点主要玄武岩储层的岩心样品，该岩心的连通孔隙率为2.05-8.76％，反应表面积为0.10-0.33 mm ^-1和更大的垂直磁导率（2.07×10 ^-10 米²相比水平渗透率（5.10×10）^-11 米²）。计算表明CO ₂CarbFix试点站点的存储容量为0.33 Gigatonnes。将XCT结果与从对同一样品进行的水力试验得到的结果进行比较，在此过程中，在实际油藏压力条件下测量了渗透率，电阻率和体积变形。发现渗透率是高度应力敏感的，对于-0.02％的体积变形变化，下降了两个数量级，相当于平均孔径减小了5μm。根据XCT分析，该孔隙收缩不足以解释这种渗透率的降低，除非结合粘土膨胀和次生矿物孔隙堵塞的影响。这些发现为玄武岩地层的未来CO ₂储存的规模扩大和优化提供了重要的基准数据。