Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
The pre-salt layer refers to deep-sea geological formations found beneath thick layers of salt deposits. These formations contain significant reserves of hydrocarbons (oil and gas) and are located off the coasts of certain countries.
Related terms
Offshore Drilling: The process of extracting oil or gas from beneath the seabed.
Salt Domes: Underground structures formed by thick layers of salt that can trap hydrocarbons.
Deepwater Horizon: An offshore drilling rig that experienced a major oil spill in 2010, highlighting environmental risks associated with deep-sea drilling.