natural gas that is always in the gaseous state in the reservoir and produces little condensable hydrocarbons (compounds composed mainly of hydrogen ... Found on http://www.britannica.com/eb/a-z/d/77
Natural gas composed mainly of methane with only minor amounts of ethane, propane and butane and little or no heavier hydrocarbons in the gasoline range.
Found on http://www.oilandgasuk.co.uk/glossary.cfm