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It may also include minor organic and inorganic chemical substances (usually < 7% in weight). 

The total range of oil densities is often classified in into the following sub-ranges (see also Fig 1):

No alt text provided for this imageImage Modified

Fig. 1 – A range of different gravity oil compositions from heavy (with dark brown colour at the left side of a bar) to the light (with light yellow colour at the right side of a bar). 
(the picture is taken from Dubost et al (2007) in SPE-108494

).One can see how the colour is changing from dark brown for Black Oil (at left) to the light yellow for Volatile Oil(at right

)

.


In
case Oil case oil does not contain dissolved gas it is called Dead Oil otherwise it is called Live Oil.

The heavier oils are usually met in Black Oil Reservoirs and lighter oils are in Volatile Oil Reservoirrs.

See also

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Natural Science / Physics / Chemistry / Chemical Substance

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