As the burial depth increases, so does the temperature, following a predictable pattern known as the geothermal gradient. Microscopic organisms like algae and zooplankton, along with vast quantities of plant material, accumulate on the floors of oceans, seas, and lakes.
How Oil Reservoirs Become Trapped Underground
This fundamental disparity defines the challenge of sustainability and underscores why oil is classified as a non-renewable resource, despite its origins in the continuous cycle of life and death on Earth. This complex process, known as the formation of fossil fuels, specifically creates liquid hydrocarbons we recognize as crude oil over millions of years.
The increasing heat and pressure begin to break down the complex organic molecules. Modern extraction techniques range from primary recovery, where natural pressure pushes the oil to the surface, to enhanced recovery methods that involve injecting water, steam, or gas to displace the remaining oil.
How Oil Reservoirs Become Trapped Underground
Due to its lower density compared to the surrounding rock and water, it is buoyant and begins to migrate upward through porous rock layers. This initial transformation phase is called diagenesis.
More About How is oil created in the earth
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