Geological Carbon Dioxide Storage - Latest Trends in Petroleum Engineering - Petroleum Engineering Previous Year Questions

Match the following:
(P) Aquifer      (I) Slows down the movement of water and not good for water (or CO₂) injection
(Q) Aquitard      (II) Evaporite rocks, such as halides or anhydrite, retarding upward movement of water/CO₂
(R) Aquicludes      (III) Preferentially stores CO₂ but not water
                         (IV) Rocks with sufficient permeability to conduct water, into which water (or CO₂) may be injected

When CO₂ and liquid water are brought in contact with each other, they may form solid hydrates. The three-phase hydrate boundary is shown in the Pressure -Temperature plot given below.
Identify the correct statements.
G = Gas Phase, H = Hydrate Phase, L = Liquid Phase

Schematic of phase diagrams for a pure gas hydrate system of methane (CH₄), carbon dioxide (CO₂), hydrogen sulphide (H₂S) and nitrogen (N₂) between the lower and upper quadruple points are shown in figure. Arrowheads indicate the stable hydrate region for a particular gas hydrate system.

Match the phase diagram with the corresponding pure gas hydrate.