Above it, a dense, non-porous caprock, like shale or salt, prevented further upward movement. The location of these reservoirs is tied to ancient geography, plate tectonics, and the specific marine environments that existed during those eras.
The Step-by-Step Process of How Crude Oil Forms
Catagenesis: The Oil Window As burial continued and temperatures rose further, kerogen underwent thermal cracking in a phase called catagenesis. With increasing depth came higher temperatures and pressures.
Tiny organisms such as algae and zooplankton thrived in these nutrient-rich waters. This complex mixture of hydrocarbons powers much of the modern world, yet its origins lie in biological and geological processes that unfolded over millions of years.
The Step-by-Step Process of How Crude Oil Forms
When these organisms died, their remains sank to the seafloor, accumulating alongside other organic matter in thick layers of sediment. In environments with low oxygen levels, bacteria could not break down all the organic matter.
More About How the crude oil is formed
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