# Resistivity - Resistivity The ability of material to resist...

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Resistivity The ability of material to resist current. R = rA L Water saturation is determined base on the resistivity of formation water and resistivity of rock saturation with water . Resistivity index = resistivity of rockat saturation resistivity of rock at 100 saturation RI = Rt Ro Formation resistivity factor : FF = Ro Rw Ro = FF Rw RI = 1 Sw n Sw = water saturation . n = saturation exponent, factor describe the tortousity of the conductive path . Sw n = FF Rw Rt At n = 2 Archie eqution Sw = FF Rw Rt Laboratory determination of formation water resistivity (Rw): 1. Dip cell (direct method) 2. Resistivity meter 3. Formation water composition(Na,Ca,…etc)

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Measurement of rock resistivity : 1. Prepare sample known dimension (L,A). 2.Sample is saturated with water. 3.Sample is placed in Electric cell and clamped between electrodes . 4.Current is passed through the rock sample. 5.Resistance is computed using ohm's law: r = V c I c 6. Rock resistivity R = rA L R o = the resistivity of the rock sample that is 100% saturated with water ,ohm-m R w = formation water resistivity ,ohm-m Rw 75 f 0 =

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