Changes

* '''Trap fluids'''—physical and chemical contrasts—especially differences in miscibility, solubility, and density—between the common reservoir fluids (primarily water, gas, and oil) that allow hydrocarbons to migrate, segregate, and concentrate in the sealed reservoir.

* '''Trap fluids'''—physical and chemical contrasts—especially differences in miscibility, solubility, and density—between the common reservoir fluids (primarily water, gas, and oil) that allow hydrocarbons to migrate, segregate, and concentrate in the sealed reservoir.

=='''Trap boundaries'''==

==Trap boundaries==

Trap boundaries define the limits of the trap and usually consist of (1) boundaries between solids, such as the contact between reservoir and seal, or (2) boundaries between fluids, such as oil–water or gas–water contacts. Temperature can also control a trap boundary as displayed by gas hydrate traps.

Trap boundaries define the limits of the trap and usually consist of (1) boundaries between solids, such as the contact between reservoir and seal, or (2) boundaries between fluids, such as oil–water or gas–water contacts. Temperature can also control a trap boundary as displayed by gas hydrate traps.