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Reservoir Rock

Porosity and permeability are two key properties of rocks which enable the formation of an oil and gas reservoir (or an underground aquifer).A reservoir will typically consist of an impermeable cap rock above porous and permeable reservoir rock. This type of geological structure (anticline) is ideal for trapping fluids.(D.Tompkins & J. Watkins, Exploring Earth and Environmental Science, ESWA) Porosity is a measure of the ratio of the pore spaces (holes) to the volume of the bulk rock and is usually expressed as a percentage. Pumice is an example of a very porous rock, which is why it is often used in gardening.In sedimentary rocks (which are the main rock types in an ocean basin), the porosity will depend on the grain size and shape, the sorting and how well cemented the sediments are.Large rounded grains will not compact together as tightly as small grains, making them more porous.Sandstone is a sedimentary rock which often has quite high porosity.This makes it an ideal rock type f…

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