true formation resistivity

true formation resistivity

[′trü fȯr′mā·shən ‚rē·zis′tiv·əd·ē]
(geophysics)
Electrical resistivity of a clean (nonshaly) porous reservoir formation containing hydrocarbons and formation water; value is greater than the resistivity when there is added water incursion.
References in periodicals archive ?
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).
[R.sub.t] = True Formation Resistivity for uninvaded zone, ohm-m