Fluids and Rocks - Introduction to Carbon Capture and Sequestration - page 450

c. CO 2 is trapped as isolated bubbles
d. Brine is trapped in the smaller capillaries
9.2. Mineral dissolution
1. What properties infl uence the characteristic time scales of
mineral dissolution? (Choose all that apply)
a. Capillary pressure
b. Surface coatings
c. Mineral type (for example, clays dissolve more rapidly than
calcite)
d. The time scale of observation
9.3. Capillary breakthrough pressure
1. What parameters determine the capillary breakthrough pressure
of a rock sample? (Choose all that apply)
a. The size of the largest pores
b. The size of the smallest pores
c. The size of the critical pore
d. The CO 2 -water interfacial tension
e. The CO 2 -water-mineral wetting angle
9.4. Residual CO 2 saturation
1. What is the expected range of residual CO 2 saturation in
sandstone?
a. 0.10 to 0.40 according to most studies
b. About 0.75
c. 0.30 to 0.50
d. It depends on the initial CO 2 saturation