Which statement correctly describes porosity and permeability for clays?

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Multiple Choice

Which statement correctly describes porosity and permeability for clays?

Explanation:
The key idea is that porosity and permeability describe different aspects of the pore space: porosity is how much void space exists, while permeability is how easily fluid can move through connected pore channels. Clays often have a lot of tiny, poorly connected pore spaces and interlayer gaps, so their porosity can be relatively high, but the pathways for fluid are extremely narrow and tortuous. This makes flow very slow, giving a very low permeability. So the statement that describes high porosity paired with low permeability matches the behavior of clays.

The key idea is that porosity and permeability describe different aspects of the pore space: porosity is how much void space exists, while permeability is how easily fluid can move through connected pore channels. Clays often have a lot of tiny, poorly connected pore spaces and interlayer gaps, so their porosity can be relatively high, but the pathways for fluid are extremely narrow and tortuous. This makes flow very slow, giving a very low permeability. So the statement that describes high porosity paired with low permeability matches the behavior of clays.

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