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==Equation for porosity prediction==
 
==Equation for porosity prediction==
Scherer<ref name=ch09r53>Scherer, M., 1987, Parameters influencing porosity in sandstones: a model for sandstone porosity prediction: AAPG Bulletin, vol. 71, no. 5, p. 485–491.</ref> studied the cores of 428 worldwide sandstones and listed the most important variables for predicting sandstone porosity:
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Scherer<ref name=ch09r53>Scherer, M., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0005/0450/0485.htm Parameters influencing porosity in sandstones: a model for sandstone porosity prediction]: AAPG Bulletin, vol. 71, no. 5, p. 485–491.</ref> studied the cores of 428 worldwide sandstones and listed the most important variables for predicting sandstone porosity:
    
* Percentage of quartz grains
 
* Percentage of quartz grains

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