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:<math>R_{\rm xo} = \frac{a R_{\rm mf}}{\phi^{2}S_{\rm xo}{}^{2}}</math> In such a zone, ''S''_w = ''S''_xo = 1 and ''a'' and ϕ are the same in both the flushed and uninvaded z

...eep || 7 ft || 50 in. || rowspan=3 | Estimate ''R''_t, ''R''_xo, and ''D''_''i'' in relatively fresh and oil mud systems || ...eep || 3 ft || 65 in. || rowspan=3 | Estimate ''R''_t, ''R''_xo, and ''D''_''i'' in relatively fresh and oil mud systems; r

:<math>FII = \frac{\frac{1}{R_{xo}} - \frac{1}{R_t}}{\frac{1}{R_{mf}} - \frac{1}{R_w}}</math> ...istivity in ohm-m, R_LLS dan R_LLD equivalent to R_xodan R_t,

...water front moves through a rock sample, resaturating it with water (S_xo)

| Mudcake thickness, ''R''_xo zone resistivity, mudcake resistivity, and hole size