The organic matter trapped in anaerobic environments—such as ocean basins—does not fully decompose. Subjected to intense heat and pressure deep within the Earth, these organic materials transform into the liquid hydrocarbon mixture we identify as crude.
Crude Oil Definition Heavy Dense API Gravity
Crude oil definition describes a naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials. Different basins contain unique combinations of source rock, reservoir rock, and trap formations, resulting in crude that ranges from the light, sweet grades found in the North Sea to the heavy, sour varieties common in Venezuelan oil sands.
This geographic diversity means the crude oil definition must account for a wide spectrum of physical and chemical properties found in nature. Consequently, specific benchmark crudes, such as West Texas Intermediate (WTI) and Brent Crude, act as the primary price references for the international market, with their values fluctuating based on global supply, demand, and geopolitical stability.
Crude Oil Definition Heavy Dense API Gravity
Sulfur content classifies the material as "sweet" (low sulfur) or "sour" (high sulfur), as sulfur compounds require complex removal processes during refining to meet environmental standards and prevent corrosion in equipment. This complex mixture forms from the remains of ancient marine organisms that settle on the ocean floor, becoming buried under layers of sediment over millions of years.
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