What is natural gas?

It is introduced in detail in Baidu Encyclopedia or Soso Encyclopedia. Let's talk about the definition of natural gas.

in a broad sense, natural gas refers to all natural gases in nature, including gases formed by various natural processes in the atmosphere, hydrosphere, biosphere and lithosphere. The commonly used definition of "natural gas" for a long time is a narrow definition from the perspective of energy, which refers to the mixture of hydrocarbon and non-hydrocarbon gases naturally contained in strata, mainly existing in oilfield gas, gas field gas, coalbed methane, mud volcano gas and biogenic gas. Natural gas can be divided into associated gas and non-associated gas. The oilfield gas produced together with crude oil is called associated gas. Non-associated gas includes pure gas field natural gas and condensed gas field natural gas, both of which exist in gaseous state in the formation. After the natural gas in condensate gas field flows out of the wellhead from the formation, it is separated into gas and liquid phases with the decrease of pressure and temperature. The gas phase is natural gas in condensate gas field and the liquid phase is condensate liquid, which is called condensate oil.

compared with coal, oil and other energy sources, natural gas produces very few substances that can affect the health of human respiratory system during combustion, and the carbon dioxide produced is only about 4% of that of coal, and the sulfur dioxide produced is also very small. There is no waste residue and waste water after natural gas combustion, which has the advantages of safe use, high calorific value and cleanliness.