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==Gross composition==
 
==Gross composition==
Most common is the breakdown of the heavier (C<sub>15+</sub>) fraction into saturated hydrocarbons (saturates), aromatic hydrocarbons (aromatics), lighter nonhydrocarbons (NSOs, polars, or resins), and heavier nonhydrocarbons (asphaltenes). Oils with terrestrial input often have high saturate/aromatic ratios, whereas those from carbonate sources have low saturate/aromatic ratios and high content of nonhydrocarbons. Saturate–aromatic ratios probably increase slightly with increasing maturity and decrease with biodegradation.
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Most common is the breakdown of the heavier (C<sub>15+</sub>) fraction into saturated hydrocarbons (saturates), aromatic hydrocarbons (aromatics), lighter nonhydrocarbons (NSOs, polars, or resins), and heavier nonhydrocarbons (asphaltenes). Oils with terrestrial input often have high saturate/aromatic ratios, whereas those from carbonate sources have low saturate/aromatic ratios and high content of nonhydrocarbons. Saturate–aromatic ratios probably increase slightly with increasing maturity and decrease with [http://www.oiltracers.com/services/exploration-geochemistry/oil-biodegradation.aspx biodegradation].
    
==Other parameters==
 
==Other parameters==
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