In Santa Barbara, California there are massive oil leaks from the seabed. Every year going on forever. You can see oil literally oozing out of the cliff faces there onto the beach. The action of the ocean waves turn the rivulets of oil into tar balls. Fun to walk on...
About one million gallons of crude oil per year naturally leak out there.
This site is just one of many on the planet. Microbes eat most of the oil.
Popular site for beach goers.
Photos of the tar http://bubbleology.com/2020/02/14/seep-science-tar-on-the-beach/
The Santa Barbara oil spill of 1969 allowed an estimated 3 million gallons of crude oil into the ocean. So not much compared to nature.
Same in the Gulf of Mexico, except that the leakage is so far out from shore it evaporates before it gets to land.............