Actually, no, not necessarily.
A regional university once calculated that natural seeps on the bottom of the Gulf release the equivalent of an Argonaut or an Amoco Cadiz into the water column annually, and have done so for perhaps 40 or 60 million years; but biological activity cleans it all up, burps, and calls for more.
People don’t realize that petroleum is an organic food for micro-organisms. Petroleum is formed from ancient plants growing via solar power. Oil is part of a grand eco-cycle, condensed and carbonized ancient biomass. Oil is not an evil toxic substance. It’s an organic fuel of organic origin. Dittos for coal.