However, it doesn't travel freely. Metagenesis: The final stage at even higher temperatures, which can convert oil into natural gas.
Specific Conditions Required for Oil Formation: Catagenesis and Metagenesis
Its specific composition—determined by the original organic material, temperature, pressure, and length of formation—varies significantly. Heavy crude is denser and more viscous.
Catagenesis: Takes place at greater depths and temperatures (60–120°C), where kerogen "cracks" into liquid petroleum. These differences are a direct result of the unique geological history each oil field experienced during its creation.
Specific Conditions Required for Oil Formation: Catagenesis and Metagenesis
Due to its lower density compared to surrounding rock, it is buoyant and begins to migrate upward through porous rock layers. The sulfur content also varies, with "sweet" oil containing low sulfur and "sour" oil requiring more refining.
More About How is oil created
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