![]() A lower pour point is better than a higher pour point as it indicates fewer paraffins in the crude oil and the oil will flow better. Crude oil can also been characterized using pour point - the lowest temperature at which the liquid will flow just before it becomes solid. Conversely, heavier crude oils flow less easily through pores in rock and are thus difficult to extract. Thus this type of crude oil is more easy to extract. Light to medium crude oils can pour easy, slightly more viscous than water, and this type of crude oil can flow through porous rock more easily. Since crude oil can vary so much in its composition, it can have different viscosity. Light crude oil contains a significant amount of natural gas liquids, whereas heavy crude oil has little or no natural gas liquids and instead contains a large number of heavy hydrocarbons. There are several different general types of crude oil. As pressure and temperature increased, the organic material slowly turned into crude oil and natural gas. After much time passed, bacteria decomposed the organic material in the absence of oxygen and the temperature of the material increased with the increased pressure on it from sediment above. In these oceans, dead organic matter fell to the ocean floor and was mixed with inorganic material. Crude oil was formed hundreds of millions of years ago in ancient oceans. ![]()
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