Changes

[[file:predicting-reservoir-system-quality-and-performance_fig9-63.png|300px|thumb|{{figure number|4}}After Wilson and Pittman.<ref name=ch09r68>Wilson, M. D., Pittman, E. D., 1977, Authigenic clays in sandstones: recognition and influence on reservoir properties and [[paleoenvironmental analysis]]: Journal of Sedimentary Petrology, vol. 47, no. 1, p. 3–31.</ref> Copyright: Journal of Sedimentary Petrology.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-63.png|300px|thumb|{{figure number|4}}After Wilson and Pittman.<ref name=ch09r68>Wilson, M. D., Pittman, E. D., 1977, Authigenic clays in sandstones: recognition and influence on reservoir properties and [[paleoenvironmental analysis]]: Journal of Sedimentary Petrology, vol. 47, no. 1, p. 3–31.</ref> Copyright: Journal of Sedimentary Petrology.]]

Detrital clays can be part of sandstone matrix or grains. As matrix, detrital clays can obliterate permeability. Detrital grains of clay are often ductile and can be compacted into pore spaces during burial. The percentage of detrital clay in a rock determines permeability. [[:file:predicting-reservoir-system-quality-and-performance_fig9-63.png|Figure 4]] shows different types of detrital clays in a sandstone.

Detrital clays can be part of sandstone matrix or grains. As matrix, detrital clays can obliterate permeability. Detrital grains of clay are often [[Ductility|ductile]] and can be compacted into pore spaces during burial. The percentage of detrital clay in a rock determines permeability. [[:file:predicting-reservoir-system-quality-and-performance_fig9-63.png|Figure 4]] shows different types of detrital clays in a sandstone.

==Effect of quartz overgrowths==

==Effect of quartz overgrowths==