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  2. Petroleum - Wikipedia

    en.wikipedia.org/wiki/Petroleum

    Petroleum [a] is a naturally occurring yellowish-black liquid mixture. It consists mainly of hydrocarbons, [1] and is found in geological formations.The term petroleum refers both to naturally occurring unprocessed crude oil, as well as to petroleum products that consist of refined crude oil.

  3. Extraction of petroleum - Wikipedia

    en.wikipedia.org/wiki/Extraction_of_petroleum

    When an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. Historically in the United States, in some oil fields the oil rose naturally to the surface, but most of these fields have long since been used up, except in parts of Alaska.

  4. History of the petroleum industry - Wikipedia

    en.wikipedia.org/wiki/History_of_the_petroleum...

    Oil field in California, 1938. The modern history of petroleum began in the nineteenth century with the refining of paraffin from crude oil. The Scottish chemist James Young in 1847 noticed a natural petroleum seepage in the Riddings colliery at Alfreton, Derbyshire from which he distilled a light thin oil suitable for use as lamp oil, at the same time obtaining a thicker oil suitable for ...

  5. Oil - Wikipedia

    en.wikipedia.org/wiki/Oil

    An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) and lipophilic (mixes with other oils).

  6. List of oil fields - Wikipedia

    en.wikipedia.org/wiki/List_of_oil_fields

    This list of oil fields includes some major oil fields of the past and present. Countries by proven oil reserves 2017. The list is incomplete; there are more than 25,000 oil and gas fields of all sizes in the world. [1] However, 94% of known oil is concentrated in fewer than 1,500 giant and major fields. [2]

  7. Petroleum geology - Wikipedia

    en.wikipedia.org/wiki/Petroleum_geology

    This is when most of the hydrocarbons are generated. Approximately 50%-90% petroleum is made and expelled at this point. The next step is the hydrocarbons entering the oil window. The oil window has to do with the source rock being the appropriate maturity, and also being at the right depth for oil exploration.

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