Nontechnical Guide to Petroleum Geology - Hyde

Jun 28th, 2015
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Crude Oil: • Aromatic molecules are 6 carbon atoms and longer in length. At the refinery, an aromatic-rich crude oil yields the highest octane gasoline and makes a valuable feedstock for the petrochemical industry. Therefore, a refiner often pays a premium for this type of crude oil. • An aromatic-rich crude oil has a fruity odor

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Nontechnical Guide to Petroleum Geology - HydeThursday, August 1, 20134:44 PMChapter 1: Nature of Oil and GasCrude Oil:Aromatic molecules are 6 carbon atoms and longer in length. At the refinery, an aromatic-rich crude oil yields the highest octane gasoline and makes a valuable feedstock for the petrochemical industry. Therefore, a refiner often pays a premium for this type of crude oil. An aromatic-rich crude oil has a fruity odorA normal crude oil has a pungent odor of gasolineAn asphaltic based crude oil contains little or no paraffin waxAsphaltic molecule has 40 to over 6- carbon atoms. (when refined it contains a large percentage of high-grade gasoline and asphalt)Paraffin-based = little to no asphaltLight oils = 35-45 APIVery fluid, often transparent, rich in gasoline and are often the most valuableWater = 10 APIHeavy oils = below 25 APIVery viscous, dark-colored, contain considerable asphalt, and are lease valuableSweet crudes: have less than 1% sulfur by weightSour crudes: more than 1% sulfur by weightIn general, heavy oils tend to be sour, whereas light oils tend to be sweet. Low sulfur crude: 0-0.6% sulfurIntermediate crude: 0.6-1.7% sulfurHigh sulfur crude has 1.7% sulfurAll crude oils contain some paraffin molecules. If the paraffin molecules are 16 carbon atoms or longer, they are waxes. The amount of wax crude oil is indicated by the pour point of the oil. Pour points of crude oils: 104- -75 degrees F (40--60C)Extremely wax

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