Study on the universal scaling behavior of residual gas phases using micro-computed tomography

CO2气体的毛细管捕集和溶解是CCS（Carbon Capture Storage）技术的两个重要的储存过程，本研究的主要目的是利用逾渗理论预测的普适标度律，对捕获气体团簇的孔尺度性质进行标度化。首次采用解析近似法计算有效溶出速率，并通过比较宏观模型（MIN3P和TOUGH2）进行检验。最重要的问题是在何种条件下该项目所研究的多孔介质属于同一普适类，以及孔隙结构、固体表面微观结构和非均匀润湿性对捕获过程的影响。系统地，孔隙结构和孔隙空间拓扑结构将使用微计算机断层扫描进行分析和量化。基于团簇分析，研究了被困气体团簇的几何形状和静态分布。捕获行为的动力学将在玻璃球单分子膜内通过光学可视化实验进行研究。流体的选择，使他们的代理CO2注入到深aquifers.The预期的结果是既有根本利益和极大的实际意义，因为它们提高了CCS技术和地下水修复（溶解残留NAPL（非水相液体）或混合气相）的预测模型。

The capillary trapping of CO2-gas and its subsequent dissolution are two important storage processes of CCS (Carbon Capture Storage) technology, which will be studied in the framework of the applied project.The central objective is an upscaling of pore-scale properties of trapped gas clusters by universal scaling laws predicted by percolation theory. For the first time, an analytical approximation method is used to calculate the effective dissolution rate and tested by comparative macroscale modeling (MIN3P and TOUGH2). Of fundamental interest is the question under which conditions the porous media studied within the project belong to the same universality class, and what is the influence of pore structure, microstructure of the solid surface and heterogeneous wettability on the trapping process.Methodically, the pore structure and the pore space topology will be analyzed and quantified using micro-computed tomography. Based on cluster analysis the geometry and the static distribution of trapped gas clusters will be studied. The dynamics of the trapping behavior will be investigated by optical visualization experiments within glass sphere monolayers. The fluids are selected so that they are proxies for CO2-injection into deep aquifers.The expected results are both of fundamental interest and of great practical relevance, as they improve predictive modeling for CCS-technology and for groundwater remediation (dissolution of residual NAPL (non aqueous phase liquid) or mixed gas phases).