Back in the 1970’s, Exxon drilled several exploration wells off the coast of Santa Barbara. They found huge deposits. The state of California ordered them to cap them and move on. The oil is still there and be accessed with old technology. No telling how much they could extract with directional drilling.
They shut down the drilling but they didn’t shut down the wells already drilled.
http://www.cccarto.com/leases/santabarbara/
There are several offshore platforms off the California coast still producing.