Abstract
Ocean sequestration is one of the technologies for mitigation of the global warming. Seabed aquifer sequestration is that stored CO_2 in the aquifer approximately 500m depth. CO_2 hydrate generated in the aquifer acts as Cap rock and it makes a possible by storing CO_2 under the hydrate layer. It is supposed that the injected CO_2 under the hydrate layer is dissolved in pore water and stored long term. But geologic properties of the aquifer influence the hydrate generation. Namely, to research on the influence of the geologic properties, such as porosity and particle diameter, on the hydrate generation and dissolution properties of the liquid CO_2 is indispensable in the estimation of the CO_2 storage capacity. However, in previous study, it is focused on the process of CO_2 diffusion in the aquifer. Therefore, knowledge of the geologic properties and solubility properties of the CO_2 is poor. In this study, influence of geologic properties on the hydrate is researched by the hydrate generation experiment. And, the thickness of the CO_2 dissolved water is observed by using ultrasonic testing.
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