My guess is that we are currently using oil faster than the earth is producing it, but it does show that there is a lot more out there than previously thought and we should go use it. The more oil they find and the more we use, the more skeptical I am that it was formed only from decomposing animal matter. There is too much oil in too many different rock types and formations for that.
Coal, on the other hand, while also plentiful, is more than likely formed from decaying plant matter. It does have the fossils in it. Lots more plant matter than animal matter. Always has been.
Considering we can make light, sweet crude from our own garbage, I would say that the idea that oil can only be made of decaying animals is a fantasy that should have been removed from the public idea 50 years ago.
Igneous, metamorphic, and sedimentary.
If you find hydrocarbons located within the igneous rock, you can make the case for abiotic oil, but if you find the hydrocarbon trapped by the igneous rock, you can't make the case.
If you find hydrocarbons located within metamorphic and/or sedimentary rock, you made the case for an organic origin. If you find hydrocarbons trapped by metamorphic and/or sedimentary rock, you can't make the case for abiotic oil.
And there are more than a dozen different varieties of coal.
For any that think differently than that, they should try applying the math of our current consumption rate times a few hundred million years.
The volume would suggest if that was possible, the problem would not be finding oil, but how to keep from drowning in it.