Changes

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|  

* Kaolinite, chlorite, and illite precipitate as a result of feldspar dissolution   

* Kaolinite, chlorite, and illite precipitate as a result of feldspar dissolution   

* Ferroan carbonate and quartz cement

* Ferroan carbonate and [[quartz]] cement

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| Deep || > 140°C or 284°F

| Deep || > 140°C or 284°F

==Effect of age==

==Effect of age==

In general, sandstones lose porosity with age. In other words, porosity loss in sandstone is a function of time. According to Scherer,<ref name=ch09r53 /> a [[Tertiary]] sandstone with a Trask sorting coefficient of 1.5, a quartz content of 75%, and a burial depth of [[depth::3000 m]] probably has an average porosity of approximately 26%. A Paleozoic sandstone with the same [[Core_description#Maturity|sorting]], quartz content, and burial depth probably has an average porosity of approximately 13%.

In general, sandstones lose porosity with age. In other words, porosity loss in sandstone is a function of time. According to Scherer,<ref name=ch09r53 /> a [[Tertiary]] sandstone with a Trask sorting coefficient of 1.5, a [[quartz]] content of 75%, and a burial depth of [[depth::3000 m]] probably has an average porosity of approximately 26%. A Paleozoic sandstone with the same [[Core_description#Maturity|sorting]], quartz content, and burial depth probably has an average porosity of approximately 13%.

==See also==

==See also==