Wildcatter's used to taste and classify oils as sweet, medium sour, and sour based on what property of oil?

Wildcatter's used to taste and classify oils as sweet, medium sour, and sour based on what property of oil?

• A. Sulfur Content
• B. Viscosity
• C. API Gravity
• D. Density

Answer: (A)

Sweet versus sour crude is defined by the sulfur content. Oil with low sulfur is considered sweet, while oil with higher sulfur is called sour. Wildcatters historically tasted (and smelled) crude to gauge this sulfur content, since sulfur compounds give a noticeable taste and odor and signal how corrosive the oil could be and how much refining work it will need. In practice, the cutoff is around 0.5% sulfur by weight: below that is sweet, above that is sour, with higher sulfur levels often labeled as intermediate. This classification isn’t about density, API gravity, or viscosity—those properties affect flow and refining steps, not whether the oil is sweet or sour.

Sweet versus sour crude is defined by the sulfur content. Oil with low sulfur is considered sweet, while oil with higher sulfur is called sour. Wildcatters historically tasted (and smelled) crude to gauge this sulfur content, since sulfur compounds give a noticeable taste and odor and signal how corrosive the oil could be and how much refining work it will need. In practice, the cutoff is around 0.5% sulfur by weight: below that is sweet, above that is sour, with higher sulfur levels often labeled as intermediate. This classification isn’t about density, API gravity, or viscosity—those properties affect flow and refining steps, not whether the oil is sweet or sour.