About Oil and Gas Deposits
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© THINKSTOCK - Hydrocarbons formed over millions of years, at the heart of major geological formations.
It takes millions of years for oil or gas to form. During this time, the molecules migrate slowly to the surface and are "trapped" in natural reservoirs.
The Slow Formation of Oil and Natural Gas Deposits
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How Oil and Gas Deposits Are Formed
Deep in the Earth, oil and natural gas are formed from organic matter from dead plants and animals. These hydrocarbons take millions of years to form under very specific pressure and temperature conditions.
How Oil and Gas Migrate
Starting out from the source rock where they are formed, hydrocarbon molecules, which are light, set off on an upward journey to the surface. They accumulate in porous rock and are blocked by impermeable rock, thereby creating oil and gas deposits.
From Traps to Commercial Deposits
Commercial oil and gas deposits occupy closed spaces created by deformations in geological layers. These spaces, known as traps, must be large enough to make developing the deposit economically viable.
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