Cap Rock 1
Cap Rock 1 :
(n.) Geology. A relatively impermeable rock, commonly shale, anhydrite or salt, that forms a barrier or seal above and around reservoir rock so that fluids cannotmigrate beyond the reservoir. It is often found atop a salt dome. Thepermeability of a cap rock capable of retaining fluids through geologic time is ~ 10-6-10-8 darcies. Syn: Seal. Alt. form: Caprock. See: Halite, Migration, Petroleum System
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