9:15 AM - 9:30 AM
[R4-02] Pore size dependence of the rates of water infiltration and air dissolution inside a rock
Keywords:Pore size, Infiltration, Entrapped air, Capillary pressure
We studied which size pores are filled with water and in what order as water infiltrates into the rock. Fontainebleau sandstone, main pore radii ranged from a few µm to several tens of µm, was used. The water saturation S was adjusted between 63% and 100%, and under each S, the amount of water in each pore radius was measured. As S increased, narrow pipes were filled with water first, then the thick pipes were. The reason seems to be that the narrower the pore, the greater the pressure of trapped air, and the air in the narrower pore is more soluble in water and the air dissolution rate is greater.