In the plot of the true formation resistivity
versus effective porosity, the Archie's parameters were calculated (a=1, m=2.06 and n=2).
Archie  first studied the relationship between soil resistivity and its structure and proposed the soil structural factor-resistivity structure factor F (formation resistivity
The formation resistivity
may be affected by salinity, anisotropy, and temperature; therefore, corrections are needed when these effects are profound.
The log readings of the formation resistivity
and gamma ray in the bentonite-rich shale interval clearly indicate that the thick bentonite beds in the mid to upper part are characterized by low formation resistivity
and high Gr values (Fig.
In the past twenty years, many authors presented induction tools comparing the apparent resistivity achieved at several hundred kHz and 2 MHz for detection of porous formation resistivity
Oil generation inferred from formation resistivity
Bakken Formation, Williston Basin, North Dakota.
of Oklahoma) and Donaldson (retired after a long career in public, private, and academic spheres) introduce mineralogy and petroleum geology before covering porosity and permeability, formation resistivity
and water saturation, capillary pressure, wettability, applications of Darcy's Law, naturally fractured reservoirs, and the effect of stress on reservoir rock properties, among other topics.
It allows imaging groundwater salinity with relatively high spatial resolution, since formation resistivity
as determined ERT strongly depends on groundwater salinity.