AB5_Lab12_AmandaHeikes - why Cementation of sediment grains...

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Lab12 Amanda Heikes AB5 3. Describe the relationship between permeability, porosity and sediment type (grain size)? Can you explain this (i.e. what must change with grain size)? As grain size increases, the porosity increases and the permeability increases. This is because the larger the grain size, the larger the pores and therefore increasing permeability also. 4. Given that sandstone is a rock composed of sand grains that have been cemented together, and that the porosity and permeability of sandstones range from 0.05-0.3 and 9.9x10-12-4.9x10-9 cm2, respectively; (a) How does cementation of sediment grains effect porosity and permeability? Explain
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Unformatted text preview: why. Cementation of sediment grains decreases porosity and permeability. This is because the process of cementation is taking the preexisting pores and filling them with new material causing the porosity and permeability to decrease. (b) Under ideal conditions and in general, can you get more or less water from an aquifer of sandstone compared to an aquifer of loose sand? You would get less water from an aquifer of sandstone compared to an aquifer of loose sand. 5. How does the velocity of groundwater flow vary with permeability? The higher the permeability the higher the velocity of groundwater....
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This note was uploaded on 04/07/2008 for the course GEOL 103 taught by Professor Stewart during the Fall '07 term at University of Illinois at Urbana–Champaign.

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