Oil is Abiotic and in Unlimited Supply
The universe is 75% hydrogen, about 24% helium and one per cent everything else. Therefore if suns planets and moons are formed from condensed matter, there should be a hell of a lot of these elements present in the initial vortex. Obviously less light elements will be retained than heavy, particlularly for the lighter planets, because there will be gravitational fractionation competing with centrifugal force. Obviously gravity wins, or planet will not form.
Helium is 2x heavier than hydrogen gas H2, yet there is almost none on Earth, because most has escaped into space. However hydrogen is plentiful in all sorts of compounds. How come if it is lighter? It turns out that hydrogen is ultrasoluble in iron at high temperature and pressure. In fact, I think it can perhaps lose a shell electron into the metal. Know what happens when hydrogen loses a shell electron? It becomes a solitary proton.
Another possibility is that at high temp and pressure the nuclear reaction can take place e + p > n.
Therefore there are at least 2 possible mechanisms whereby the cores of moons and planets can accomodate vast amounts of superdense hydrogen. We could be talking anything up to 99% of the core. More likely the % hydrogen trapped this way is dependent on the mass of the body.
Now what would happen as this planet cools as it must due to black body radiation? Since solubility depends on temperature the core cannot hold as much hydrogen as initially. Released hydrogen re-forms in atomic form, greatly expanding the volume of the planet. Here we have the true mechanism for the expanding Earth. By studying the OP in this section, you can see expansion on Mars the Moon and other planets. It seems all of these release hydrogen.
Hydrogen coming up through the hot mantle will reduce (chemical term) rocks in the mantle to form hydrogen compounds. Excess hydrogen will outgas into the atmosphere and even under todays gravity can escape into space. Today we still have methane, hydrogen sulphide and ammonia exhaling from volcanoes and geothermal vents. Water too is a hydrogen compound, covering 2/3 of the planet.
There have been huge Earth changes, and these have come from the core.
Once hydrogen is released in quantity from the core, not only does the Earth begin to expand, but the compounds needed for life are formed. Now we see why there is so much natural gas around. Now we see how we can have hydrocarbon lakes on Titan, and methane releases on Mars.
Please review the evidence showing expansion all over the Solar System, then we will try to account for the dinosaurs