The world's three major energy refers to

Mainly composed of carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus and other elements, carbon, hydrogen, oxygen and the sum of about 95% of the organic matter, is a very important energy source, but also an important raw material for metallurgical and chemical industries, lignite, bituminous coal, anthracite, semi-anthracite, which are classified. As of 2011, China is the world's largest coal producer, coal production of 3.24 billion tons, equivalent to 1.804 billion tons of oil equivalent, accounting for the world's proportion of up to 48,3%.

2, oil

is one of the main objects of geological exploration, is a viscous, dark brown liquid, known as the "blood of industry". Oil is stored in some parts of the upper crust of the earth. The main component is a variety of alkanes, cycloalkanes, aromatic hydrocarbons mixture. The mechanism of petroleum oil and petrochemical oil deposition of biological oil and petrochemical oil two doctrines, the former more widely accepted, that oil is the ancient ocean or lake organisms after a long evolutionary formation, belonging to the biological deposition of oil, can not be renewed.

3, natural gas

refers to all naturally occurring gases in nature, including the atmosphere, the hydrosphere, and the lithosphere in the formation of a variety of natural processes of the gas (including oil field gas, gas field gas, mud volcanic gas, coal bed methane, and biogenic gas, etc.).