527 Q16 CO2 Geologic Storage

Which of the following are feasible geological formations for CO₂ storage?

(check all that applies; no partial credit)

• Deep saline aquifers

• Basaltic rocks

• Coal bed formations

• Depleted hydrocarbon reservoirs

• Volcanic lava

Which of the following geological formations has the highest estimated storage capacity?

• Deep saline aquifers

• Basaltic rocks

• Coal bed formations

• Depleted hydrocarbon reservoirs

• Volcanic lava

Which parameter is most influential in determining the CO₂ containment security and storage capacity?

• Surface wettability

• Method of carbon capture used in power plants

• Injecting N₂ with CO₂ underground to form carbamates

• The presence of bacteria and microorganisms underground

What is CO₂ wettability?

• The ability of CO₂ to be in a liquid state

• A property of the rock, which measures the adherence of CO₂ and other aqueous fluids to it

• The miscibility of supercritical CO₂ in underground oil

• How much CO₂ can dissolve in brine water

What are the factors affecting CO₂-wettability in geological storage?

(check all that applies; no partial credit)

• Pressure

• Temperature

• Salinity

• Formation type

• Chemicals

How can wettability be quantified experimentally?

• Conduct contact-angle experiments on a tilted plate

• Spray the test surface with water before conducting the experiments

• Conduct the experiments with liquid CO₂

• Measure the maximum concentration of dissolved CO₂ in water

If the concentrations of organic acids on rock formations are high enough, they could diminish the CO₂ storage capacity.

• True

• False

Certain nanoparticles can be injected with the CO₂ underground to improve its wettability.

• True

• False

What are the competing priorities that prevent the large-scale implementation of underground CO₂ storage?

(check all that applies; no partial credit)

• Economic aspects

• Policies

• Environmental priority

• Scientific advancements

Which rock formations are better suited for mineral trapping of CO₂?

• Rocks containing sodium cations (Na⁺), like NaCl

• Rocks containing divalent cations (Ca²⁺, Fe²⁺, Mg²⁺)

• Rocks containing amine compounds

• Rocks containing carbonate salts