A gas well whereas, mostly comprises of heavy and light hydrocarbons, both in gaseous forms.
When in condensed form, these are called condensate. Condensate resembles petrol in
appearance and has similar physical properties to crude oil.
Petroleum retrieved from different places may vary in composition and therefore will have
different physical and chemical properties. It may vary greatly in color and viscosity, etc.
Source:
http://www.researchomatic.com/the-composition-and-uses-of-petroleum-147177.html
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