This stage, known as catagenesis, occurred at temperatures between 90°C to 160°C (194°F to 320°F). Primary recovery relies on natural pressure, while secondary recovery involves injecting water or gas to push more oil to the surface.
Sedimentation and Burial: How Organic Matter Transforms into Crude Oil
Crude oil is a fossil fuel formed from the remains of tiny aquatic organisms called plankton that lived millions of years ago. 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.
Enhanced oil recovery methods, such as thermal injection and chemical flooding, are used to extract remaining reserves efficiently. The hydrocarbons migrated through porous rock formations, eventually accumulating in reservoir rocks where they formed oil pools.
Sedimentation and Burial: How Organic Matter Transforms into Crude Oil
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. These geological structures, such as anticlines, fault traps, and salt domes, act as reservoirs that hold the oil in place until extraction.
More About How crude oil was made
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