As a gaseous fossil fuel, nautral gas is found in oil fields, coal beds and natural gas fields.
Natural gas must undergo a series of treatments before it is used to remove all other components except for methane. Some of the by-poducts include ethane, propane, butanes, pentanes and higher molecular weight hydrocarbons.
Natural gas is measured in normal cubic meters or in standard cubic feet. Many challenges are faced when transporting and storing natural gas because of its low density. Pipelines are used, but are impractical across oceans.