What type of energy produces oil?

Answer 1

The energy stored in mineral oil is in the form of carbon that produces energy when it forms atomic bonds with oxygen to form carbon dioxide in the burning process.

That energy was originally stored when plants used to Sun's energy to separate carbon and oxygen from atmospheric carbon dioxide millions of years ago, by photosynthesis. Plants used the carbon to form tissues made from long chains of carbon atoms.

In that way, burning oil, coal and natural gas releases the Sun's energy, stored millions of years ago.

1 kg of fossil fuel burns with approximately 2.5 kg of oxygen to produce 3.5 kg of carbon dioxide.