What is a caprock?

Understand the Problem

The question is asking for a definition or explanation of what a caprock is, typically in the context of geology. Caprock refers to a hard layer of rock that lies above softer rock or sediment, often serving as a barrier for the migration of fluids, such as oil and gas.

Answer

A resistant, impermeable rock layer that seals reservoir rocks.

Caprock is a more resistant, relatively impermeable rock layer that forms a barrier or seal above and around less resistant rock types, commonly reservoir rocks such as those containing hydrocarbons.

Answer for screen readers

Caprock is a more resistant, relatively impermeable rock layer that forms a barrier or seal above and around less resistant rock types, commonly reservoir rocks such as those containing hydrocarbons.

More Information

Caprocks play a critical role in the formation and preservation of hydrocarbon reservoirs by trapping oil and gas beneath them.

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