# Difference between revisions of "Dictionary:Dar Zarrouk"

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where ''z''<sub>''i''</sub> are layer thicknesses. See Maillet (1947). | where ''z''<sub>''i''</sub> are layer thicknesses. See Maillet (1947). | ||

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## Revision as of 13:22, 28 May 2014

(dar zar ruk’) The name given by Maillet to resistivity parameters or curves that deal with layered anisotropic materials. The **dar Zarrouk variable** is the **transversal unit resistance** (ρ_{T}), the depth integral of the transverse resistivity perpendicular to the strata; the **dar Zarrouk function** is the **longitudinal unit conductance** (1/ρ_{L}), the depth integral of the conductivity parallel to the strata; and the **dar Zarrouk curve** is a plot of the mean resistivity (ρ_{T}) of the formation down to the depth *z*, plotted versus the anisotropy coefficient times *z*(ρ_{T}ρ_{L})^{1/2}:

_{T}=Σρ

_{i}

*z*

_{i}and 1/ρ

_{L}=Σ

*z*

_{i}/ρ

_{i},

where *z*_{i} are layer thicknesses. See Maillet (1947).