Gas all of us are not strange, natural gas is all that exists in the nature of natural gas, including atmosphere, hydrosphere, and lithosphere in the formation of various natural process gas, including oil field gas, gas gas, mud volcano, biological generated gas and coalbed methane gas, with the progress of era and the development of science and technology is widely used by people, Is a clean source of energy, and what kinds are there?

1. According to the phase states existing underground, natural gas can be divided into free state, dissolved state, adsorbed state and solid hydrate. Only the free natural gas can be developed and utilized by the accumulation of natural gas reservoirs.

2. Natural gas can be divided into associated gas and non-associated gas according to the form of storage and generation.

Associated gas: Oil field gas that is produced at the same time as crude oil and is associated with crude oil. The associated gas is usually the volatile part of the crude oil, which exists in the form of gas above the oil bearing layer. It exists in all the formations with crude oil, but the proportion of oil and gas is different. Even oil and gas in the same field may not come from the same source. They converged in the same rock reservoir by different pathways and by different processes.

Non-associated gas: including pure gas field and condensate gas field, both of which exist in the formation as gas. After the natural gas in the condensate field flows out of the wellhead from the formation, with the decrease of pressure and the increase of temperature, it is separated into two phases: the gas phase is the natural gas in the condensate field, and the liquid phase is the condensate liquid, which is called condensate oil. If it is non-associated gas, it has nothing to do with liquid accumulation and may be generated from plant matter. Natural gas production in the world is mainly gas field and oil field gas. The exploitation of coalbed methane has been paid more and more attention.

3. According to the state of natural gas, it is divided into three kinds: structural natural gas, water-soluble natural gas and coal mine natural gas. The structural natural gas can be divided into wet natural gas produced with crude oil and dry natural gas without liquid content.

4. Natural gas can be divided into biogenic gas, oil gas and coal gas according to its origin. Inorganogenic gases, especially non-hydrocarbon gases, are highly valued.

5. According to the occurrence of natural gas underground, it can be divided into oilfield gas, gas field gas, condensate gas, water-soluble gas, coal-bed gas, and solid gas hydrate, etc.