Migration and Trapping Once formed, the oil is not static; it is buoyant and less dense than the surrounding rock. Deep beneath the Earth's surface, a slow geological alchemy transforms the remnants of ancient life into the fuel that powers modern civilization.
The Fascinating Journey of Crude Oil: How Is Oil Formed Deep Underground
Kerogen is a solid, mixture of organic chemical compounds that retains the complex molecular structure of the original biological material without yet becoming liquid oil. It breaks down further into natural gas or, eventually, into elemental carbon and graphite.
It encounters cap rocks—dense, non-porous layers like shale or salt—that act as a seal. The Origin of Organic Material The story begins in warm, shallow seas where microscopic organisms like algae and zooplankton thrived.
The Journey of Crude Oil: How Is Oil Formed Deep Underground
If the temperature exceeds 120°C for an extended period, the oil continues to degrade. When these creatures died, their bodies sank to the seafloor, mixing with sediments and mud.
More About How is oil is formed
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