There are many theories about the origin of oil, but none of them have been officially certified, so the question of the origin of this oil is still a very interesting mystery. The most widely circulated one is from the fossils of previously dead creatures. Because of several crustal movements, many previous ancient creatures were perished for various reasons. became a lot of fossils. These once-living fossils, together with soil sand and gravel, descended through a kind of subsidence, and became sedimentary rocks through the action of pressure. This stone is the predecessor of oil.
