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Line 39: − Pore-bridging clays, like illite, decrease porosity slightly but can destroy sandstone permeability. Discrete particle clay, like kaolinite, lowers porosity and permeability only slightly. The diagram below 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. − + + +
Sandstone permeability prediction from texture (view source)
Revision as of 17:09, 18 February 2014
, 17:09, 18 February 2014→Effect of authigenic clays
==Effect of authigenic clays==
==Effect of authigenic clays==
[[file:predicting-reservoir-system-quality-and-performance_fig9-61.png|thumb|{{figure number|9-61}}. Copyright: North, 1985; courtesy Allen & Unwin.]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-61.png|thumb|{{figure number|2}}. Copyright: North, 1985; courtesy Allen & Unwin.]]
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 geometry and clay minerals==
==Pore geometry and clay minerals==