An aqueous CO₂–cement interaction experiment along with X-ray computed micro-tomography characterisation of pre- and post-exposure cement samples was carried out to investigate the cement structure evolution under geologic carbon storage conditions. An image processing framework was proposed for mapping mineral dissolution and precipitation and characterisation of carbonate shell morphology. The main workflow covered in this framework is to, 1) register cement CT images before and after reaction; 2) generate the difference image showing chemical alteration and map the difference image to local content change of pore, calcite and portlandite; 3) segment carbonate shell from the difference image; 4) generate auxiliary images including skeleton, 3D local thickness and surface boundaries for measurement focused on carbonate region, and 5) spatial quantification of the area, thickness, penetration depth and pore/calcite/portlandite content change of the carbonate shell. The effectiveness of the framework was validated through step-by-step results demonstration when deploying the framework to process the CT images of six cement samples acquired before and after reaction with CO₂. The 3D mineral precipitation and dissolution (or local content change) map and the internal and external carbonate shells were visualised. The spatial distribution of the shell area, thickness, penetration depth and pore/calcite/portlandite content change along the height of the sample was revealed. Overall, the dissolution and precipitation map gives more intuitive and interpretable result of CO₂-induced chemical alteration than direct visual comparison from the original CT images, and the morphological quantification for the carbonate shell gives reasonable interpretation of the spatial distribution of the carbonate reaction.

含水CO ₂进行了水泥-水泥相互作用实验以及X射线计算机微观断层表征前后的水泥样品，以研究地质碳储量条件下水泥结构的演变。提出了一种图像处理框架，用于绘制矿物溶解和沉淀以及碳酸盐壳形态的特征图。该框架涵盖的主要工作流程是：1）在反应之前和之后注册水泥CT图像；2）产生显示化学变化的差异图像，并将差异图像映射到孔隙，方解石和硅酸盐的局部含量变化；3）从差异图像中分割碳酸盐壳；4）生成包括骨架，3D局部厚度和表面边界在内的辅助图像，以专注于碳酸盐区域进行测量，5）对碳酸盐壳层的面积，厚度，渗透深度和孔隙/方解石/钙铁矿含量变化进行空间量化。通过使用分步结果演示验证该框架的有效性，该结果演示了将该框架部署为处理与CO反应前后采集的六个水泥样品的CT图像₂。可视化了3D矿物沉淀和溶解（或局部含量变化）图以及内部和外部碳酸盐壳。揭示了沿样品高度的壳面积，厚度，穿透深度和孔/方解石/硅酸钙含量的空间分布。总体而言，与直接从原始CT图像进行直观比较相比，溶解和沉淀图提供了CO ₂诱导的化学变化的更直观和可解释的结果，并且碳酸盐壳的形态定量给出了碳酸盐反应空间分布的合理解释。