From https://en.wikipedia.org/wiki/Coal_Oil_Point_seep_field https://en.wikipedia.org/wiki/Coal_Oil_Point_seep_field 100 to 150 barrels worth of liquid petrole

From https://en.wikipedia.org/wiki/Coal_Oil_Point_seep_field https://en.wikipedia.org/wiki/Coal_Oil_Point_seep_field 100 to 150 barrels worth of liquid petroleum per day. 36,500 to 54,750 per year. It leaks about as much as the 1969 oil spill every 2 years. Or about as much as the Refugio oil spill every month. I would assume the sudden influx of oil has a hugely adverse affect on wildlife, which still makes them problematic. And 2 years worth of leaks in 10 days sounds catastrophic to the local wildlife. But long term it doesn't seem like either of these spills would be a major contributor to the tar you find on beaches in the region today.