Further Conversion to Crude Oil With increased depth and temperature, kerogen underwent thermal cracking, transforming into liquid hydrocarbons. Crude oil is a fossil fuel formed from the remains of tiny aquatic organisms called plankton that lived millions of years ago.
Deep Underground Crude Oil Formation Conditions
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. This organic-rich sediment was crucial for oil formation, as it contained the necessary carbon-based materials that would eventually become fossil fuels.
Enhanced oil recovery methods, such as thermal injection and chemical flooding, are used to extract remaining reserves efficiently. The Biological Origins: Ancient Plankton and Algae The story of crude oil begins in ancient oceans, lakes, and seas where microscopic organisms such as algae and plankton thrived.
Deep Underground Crude Oil Formation Conditions
This process, known as diagenesis, converted the organic matter into a waxy substance called kerogen. 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.
More About How crude oil was made
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