Petroleum is a general term for crude oil and natural gas. Primary source of automative fuels and lubricant oils. Thought to have been formed from decomposition of animal and vegetables life under heat and pressure during geologic periods it occur usually in deep rock but sometimes near to the surfeve. When refined it produced hundred of petrochemical that are converted into unlimited products with new ones appearing continually. In most oil fields oil and natural gas occur together gas being the top layer on crude oil under which may lay water.
Top four largest oil deposits in the world: oil reserve left for about 40 years.
1 The piceance & unit basins USA discovery date: 1912
Est total resources: 2.855 trillion barrels Est remaining: 2.855 trillion barrels.
The total area covered by the deposits is about 41440sq. Kms.
2 The Orinoco belt Venezuela discovery date: 1930s
Est total resources: 1.3. Trillion barrels. Est remaining : 530 billion barrels...
3 The Alberta oil stans Canada discovery date: 1980
Est total resources: 173 billion barrels Est remaining: 169 billion barrels.
4 Ghawar Saudi Arabia discovery date: 1948
Est total resources: 162 billion barrels Est remaining: 107 billion barrels
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