I am not an oil expert but have read that off the coast of Loonacali there is oil seeping from under the sea, close enough that some of the beaches have to be cleaned. Don’t know if true but would not doubt it.
Back in the 1970’s Exxon drilled several exploration wells off the coast of Santa Barbara. They found huge deposits.
The State of Insanity then made drilling off limits.
The wells were capped off then, but the oil is still there.
As far as I know, none of the oil was ever extracted from those reserves. But yes it is seeping out and ending up on the beach.
Bet that most Cali residents have no idea of this.
Google “Long Beach oil fields”................