Geological Traps and Reservoir Formation Crude oil does not remain in the source rock but migrates through porous and permeable rocks until it is trapped by non-porous rock layers called cap rocks. Typically, temperatures between 60°C to 120°C (140°F to 250°F) and pressures from thousands of atmospheres caused the organic material to break down.
Millions Years Crude Oil Formation Timeline: From Organic Matter to Reservoir Traps
The hydrocarbons migrated through porous rock formations, eventually accumulating in reservoir rocks where they formed oil pools. Sedimentation: The Burial Process Over millions of years, layers of sediment accumulated on top of the organic matter, burying it deeper beneath the Earth's surface.
These geological structures, such as anticlines, fault traps, and salt domes, act as reservoirs that hold the oil in place until extraction. This process, known as diagenesis, converted the organic matter into a waxy substance called kerogen.
Millions of Years: The Formation Timeline of Crude Oil
This stage, known as catagenesis, occurred at temperatures between 90°C to 160°C (194°F to 320°F). This continuous burial process isolated the organic material from oxygen, preventing complete decomposition.
More About How crude oil was made
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More perspective on How crude oil was made can make the topic easier to follow by connecting earlier points with a few simple takeaways.
