How did oil get under the seabed?

Oil formed from the remains of ancient marine organisms, such as plankton and algae, that accumulated on the seabed millions of years ago. Over time, layers of sediment buried these organic materials, subjecting them to heat and pressure, which transformed them into hydrocarbons. Geological processes, including tectonic movements, then trapped these hydrocarbons in porous rock formations beneath the seabed, where they accumulate until extracted through drilling.