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Sedimentary rocks are quite common, covering about 75% of the Earth's surface.
However, the volume of Sedimentary rocks is low, indicating limited thickness of these rocks.
Sedimentary rocks are normally split into two categories:
It holds the most of Hydrocarbon Reserves, both explored and estimated.
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology + Petrophysics / Rock
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