These are highly porous formations, such as sandstone or limestone, which act like sponges deep underground. Modern Extraction: Accessing the Subsurface Reservoirs.
Understanding Traps, Reservoirs, and Cap Rock in Oil Formation
The journey of crude oil begins millions of years ago, deep beneath the Earth's surface, where the remains of ancient marine microorganisms settle on the floor of long-gone oceans and seas. These occur where fractures or faults in the Earth's crust allow the pressurized oil to escape to the surface, creating pools of sticky, volatile liquid.
Its formation is entirely biological, starting with the accumulation of organic matter. Under these conditions, the complex organic molecules break down and reorganize.
How Traps, Reservoirs, and Cap Rock Form Crude Oil Reservoirs
As the sediment layers build up, the increasing weight presses the material deeper underground, subjecting it to intense heat and pressure. When these organisms died, their soft bodies would typically decompose, but in specific environments, such as the anoxic conditions of deep ocean basins, they were protected from complete decay.
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