constants for Archies Law

Weakly cemented detrital rocks such as sand, sandstones, and some limestones, with a porosity range from 25 to 45%, usually Tertiary in age

a = 0.88, m = 1.37

Moderately well cemented sedimentary rocks, including sandstones and limestones, with a porosity range from 18 to 35%.

a = 0.62, m = 1.72

Well cemented sedimentary rocks with a porosity range from 5 to 25%, usually Paleozoic in age

a = 0.65, m = 1.79

Highly porous volcanic rocks such as tuff, aa, and pahoehoe, with porosity in the range of 20 to 80%

a = 3.5, m = 1.44

Rocks with less than 4% porosity including dense igneous rocks and metamorphosed sedimentary rocks

a = 1.4, m = 1.58

saturation exponent n

1.5 - 3

rock constant a

0.6 - 1

cementation exponent

1 - 3