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You are watching: Is the volume of voids or open space in a rock or unconsolidated material.





The pore space of one aquifer is the spaces or voids between the solid material. The porosity that the aquifer is the volume that void room to the complete volume, frequently expressed as a percentage.
Effective porosity
is the room available for fluid to flow, and is calculated as the volume that interconnected void an are to the total volume, frequently given as a percentage.
Porosity can be considered either primary or secondary. Void spaces in major porosity
created at the moment the geologic product was created. Void spaces in secondary porosity formed after the rock was created. Examples of secondary porosity encompass fractures, solution-created channel ways, etc.
Porosity is extremely dependent ~ above the arrangement, the shape, and also the dimension of the material. However the diameter of the grain size does not impact porosity, because it is the ratio of open an are volume to full volume. Because that example, a box full of football balls and also a box complete of tennis balls will have actually the very same porosity, provided they are packed the same way. To assist illustrate this, view the complying with example:
The setup of miscellaneous grains is dubbed the degree of sorting
and is portrayed below. Well-sorted samples typically have higher portosiy 보다 poorly sorted samples. Poorly sorted samples contain seed that have tendency to to fill in the void spaces.
Angularity deserve to also affect porosity. Samples through angular grains have tendency to have lower porosity than well rounded grains, especially of similar sizes:
The porosity the rocks and also unconsolidated sediments vary. Some examples include (Source: Cheery and also Freeze, 1979):
Rocks
Porosity (%) Fractured basalt 0.05 - 0.50 Karst limestone 0.05 - 0.50 Sandstone 0.05 - 0.30 Limestone, dolomite 0.00 - 0.20 Shale 0.00 - 0.10 Fractured crystalline rock 0.00 - 0.10 Dense crystalline rock 0.00 - 0.05 Unconsolidated Deposits Gravel 0.25 - 0.40 Sand 0.25 - 0.50 Silt 0.35 - 0.50 Clay 0.40 - 0.70


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Permeability is the lull in i m sorry water flows with the rock"s spicy structure. A rock may be highly porous, however if the spicy spaces are not connected, it is not permeable. The following diagram represents hypothetical flow paths through a porous media.