Changes

==Effect of quartz overgrowths==

==Effect of quartz overgrowths==

In general, as quartz cement precipitates, the pore–pore throat size ratio approaches 1 (Hartmann et al., 1985). Throats are reduced less than pore space; therefore, permeability is affected less than porosity. During cementation, the size of the pore spaces between the pore-filling crystals decreases until it approaches the size of the pore throats. Throats become more tabular or sheet-like. Sandstone porosity may be quite low (

In general, as quartz cement precipitates, the pore–pore throat size ratio approaches 1 (Hartmann et al., 1985{{citation needed}}). Throats are reduced less than pore space; therefore, permeability is affected less than porosity. During cementation, the size of the pore spaces between the pore-filling crystals decreases until it approaches the size of the pore throats. Throats become more tabular or sheet-like. Sandstone porosity may be quite low (

==Effect of fractures==

==Effect of fractures==