Reservoir Properties of the St. Peter Sandstone in Illinois

cross plot of the St. Peter core measured permeabilty with porosity for wells in Illinois

A cross plot of porosity compared with permeability from St. Peter Sandstone core in the Illinois Basin suggests that a 20 md permeability cuttoff would correspond to a 13% porosity. The 20 md cuttoff was based on natural gas storage fields in Illinois.