As a companion to oil, the conditions for generating natural gas are more diverse than oil. Oil can only be generated in large quantities when it reaches a certain burial depth, while natural gas is available from shallow to deep. Shallow may be only a few hundred meters, and deep may have In terms of material sources, petroleum is mainly composed of organic matter that floats in the water, and natural gas can also have organic matter such as higher plants. For the cause, most of the current transfers in the geological sciences agree with the organic theory, saying that oil And natural gas are transformed from various organisms that died in ancient times. What cannot be learned from this text is:. ['Oil is buried deeper than natural gas.', 'Petroleum is mostly converted from aquatic organisms.', 'Oil and gas are transformed by various organisms.', 'Floating animal and plant organic matter is also a source of natural gas.']