Its formation is entirely biological, starting with the accumulation of organic matter. Engineers analyze these properties to determine how much oil can be extracted economically.
How Modern Drilling Extracts Oil from Deep Underground Reservoirs
As the sediment layers build up, the increasing weight presses the material deeper underground, subjecting it to intense heat and pressure. This transformation typically takes millions of years, locking the energy of the sun in a dense, black liquid.
Kerogen, a waxy substance, is the intermediate stage, and with further heat and time, this kerogen undergoes thermal cracking, breaking into the smaller hydrocarbon chains that constitute liquid crude oil. Without these natural traps, the oil would continue to migrate until it reached the surface, where it would degrade or be consumed by bacteria.
The Biological Origin of Modern Oil Reservoirs
This process, known as diagenesis, occurs at temperatures generally between 60° and 120° Celsius. The primary contributors are plankton—tiny floating animals—and algae, which thrived in ancient seas.
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