Changes

==Effect of fractures==

==Effect of fractures==

[[Fracture]]s enhance the permeability of any sandstone reservoir. Fractures are especially important for improving the permeability of sandstone reservoirs with abundant microporosity or disconnected dissolution porosity.

[[Fracture]]s enhance the [[permeability]] of any sandstone [[reservoir]]. Fractures are especially important for improving the permeability of sandstone reservoirs with abundant [Wikipedia:Microporous material microporosity] or disconnected dissolution porosity.

===Predicting from texture and clay content===

===Predicting from texture and clay content===

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| Estimate [[grain size]], [[Core_description#Maturity|sorting]], and [[porosity]] using the [[Depositional environments|depositional environment]]. For example, if a reservoir is a beach sand, it should be fine to medium grained and well sorted with well-rounded quartz grains

| Estimate [[grain size]], [[Core_description#Maturity|sorting]], and [[porosity]] using the [[Depositional environments|depositional environment]]. For example, if a reservoir is a [[beach]] sand, it should be fine to medium grained and well sorted with well-rounded quartz grains

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| Determine if authigenic clay is present. If so, what kind: pore lining, discrete particle, or pore-throat bridging? Adjust permeability downward according to clay type present.

| Determine if [ http://dictionary.reference.com/browse/authigenicauthigenic] clay is present. If so, what kind: pore lining, discrete particle, or pore-throat bridging? Adjust permeability downward according to clay type present.

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| Determine if detrital clay is present using depositional environment (i.e., high energy = low clay content). If detrital clay is likely, then expect permeability to be low.

| Determine if [ http://www.thefreedictionary.com/Detrital detrital] clay is present using depositional environment (i.e., high energy = low clay content). If detrital clay is likely, then expect permeability to be low.

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