二酸化炭素地下貯留における貯留メカニズムの学術基盤構築

在这一年里，我们对捕获相在多孔介质中的溶解进行了全面的研究，考察了润湿性对捕获相和溶解过程的影响。以非水相液体为捕集相，用十八烷基三氯硅烷浸泡多孔介质，可使体系的润湿性由水湿变非水湿。然后进行了溶解传质实验并进行了考察。这些结果被总结并发表在《全环境科学》上。我们还研究了不同气体对捕获气体溶解的影响。通过改变不同性质的气体，如密度、溶解度和扩散系数，阐明了捕获的CO2气体独特的溶解行为，并建立了各种气体在不同流量下的无量纲数值模型关系。其中一些结果被总结并发表在日本采矿和材料加工研究所杂志上。其他部分正在分析中，不久将作为学术论文提交。另一项工作与称为溶解指法的特殊现象有关。通过改变多孔介质的特性，观察到当多孔介质与颗粒大小之比足够大时，会形成溶解指进。总结了这种溶解指进对溶解传质速率的影响，并作为研究论文发表在《水资源研究》杂志上。

In this year, we performed comprehensive studies on the dissolution of trapped phase in porous media.We investigated the effect of wettability on the trapped phase and the dissolution process. By using, non-aqueous phase liquids as the trapped phase and immersing the porous media under octadecyltrichlorosilane, the wettability of the system can be altered from water wet to non-water wet. The dissolution mass transfer was then performed and investigated. The results were summarized and published in Science of The Total Environment.We also investigated the effect of different gases on the dissolution of trapped gases. By changing the gas with different properties, such as density, solubility, and diffusion coefficient, we elucidate the unique dissolution behavior of trapped CO2 gas and also developed the non-dimensional number model relations of various gases under various flow rate. Some of the results were summarized and published in Journal of the Mining and Materials Processing Institute of Japan. Other parts are now analyzed and will be submitted as an academic paper soon.Another work is related with peculiar phenomenon called as dissolution fingering. By changing the porous media characteristics, we observed the formation of dissolution fingering when the porous media to particle size ratio is large enough. The effects of this dissolution fingering to the dissolution mass transfer rate were summarized and published as a research paper in Water Resources Research.