Archie cementation exponent (m) versus porosity

• Chert conglomerate mavg=2.59+0.27

• Autoclastic chert w/clay mavg=2.3659+0.27

• Autoclastic chert mavg=2.25+0.25

• Nodular chert mavg=1.92+0.05

• Chert dolomite mudstone mavg=1.97+0.11

• Bioclastic wacke-grainstone mavg=1.77+0.05

• Trendline for m versus porosity

m = 0.014*?a+1.66

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