Changes

Pore-bridging clays, like [[illite]], decrease porosity slightly but can destroy sandstone [[permeability]]. Discrete particle clay, like [[kaolinite]], lowers [[porosity]] and permeability only slightly. [[:file:predicting-reservoir-system-quality-and-performance_fig9-61.png|Figure 2]] compares porosity-permeability relationships for kaolinite-, [[chlorite]]-, and illite-cemented sandstones. Note there is no significant change in porosities, but permeabilities range over four orders of magnitude.

Pore-bridging clays, like [[illite]], decrease porosity slightly but can destroy sandstone [[permeability]]. Discrete particle clay, like [[kaolinite]], lowers [[porosity]] and permeability only slightly. [[:file:predicting-reservoir-system-quality-and-performance_fig9-61.png|Figure 2]] compares porosity-permeability relationships for kaolinite-, [[chlorite]]-, and illite-cemented sandstones. Note there is no significant change in porosities, but permeabilities range over four orders of magnitude.

[[file:predicting-reservoir-system-quality-and-performance_fig9-62.png|thumb|300px|{{figure number|3}}After Neasham.<ref name=ch09r40>Neasham, J. W., 1977, The morphology of dispersed clay in sandstone reservoirs and its effect on sandstone shaliness, pore space, and fluid flow properties: Proceedings of the SPE Annual Meeting, October 9–12, paper SPE-6858.</ref> Copyright: SPE.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-62.png|thumb|300px|{{figure number|3}}Pore lining and discrete particle clays. After Neasham.<ref name=ch09r40>Neasham, J. W., 1977, The morphology of dispersed clay in sandstone reservoirs and its effect on sandstone shaliness, pore space, and fluid flow properties: Proceedings of the SPE Annual Meeting, October 9–12, paper SPE-6858.</ref> Copyright: SPE.]]

[[:file:predicting-reservoir-system-quality-and-performance_fig9-62.png|Figure 3]] shows pore lining and discrete particle clays that decrease porosity and permeability only slightly in contrast to pore-bridging clays, which decrease porosity slightly but substantially lower permeability.

[[:file:predicting-reservoir-system-quality-and-performance_fig9-62.png|Figure 3]] shows pore lining and discrete particle clays that decrease porosity and permeability only slightly in contrast to pore-bridging clays, which decrease porosity slightly but substantially lower permeability.