Conventional oil and gas occur in typical geologic traps near the earth's surface within porous sedimentary rocks, whereas unconventional oil and gas occur in<u> shale</u> rock thousands of feet below the surface.
In the field of geography, such a kind of oil or gas that can be pulled from the ground through pumps is referred to as conventional oil and gas. On the other hand, such a kind of oil or gas that cannot be pulled by traditional methods and are difficult to be extracted is referred to as unconventional oil and gas.
Conventional oil and gas are easier to be pumped because they are extracted from sedimentary rocks that are porous and are present near the surface of the earth.
On the other hand, unconventional oil and gas are present in the shale rocks that are neither much porous and also are buried deep in the surface.
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