CSIR-NET JUNE 2018
101) The Formation factor obtained for the data
given below is
Resistivity of the flushed zone=1.30Ωm
Resistivity of the mud filtrate=0.65Ωm
Residual oil saturation=25%
Saturation exponent = 2
a)0.125
b)1.125
c)2.125
d)3.125
(Thanks to Suresh Sir ANU)
(Thanks to Neeraja AU)
Sol:
The relation between Resistivity of the flushed zone, Resistivity of the mud filtrate, Water Saturation and Formation factor is.
S_w^n=\frac{FR_{mf}}{R{xo}}-(1)
n=2
Above problem Residual oil saturation is given, using this we can calculate the Water Saturation using below formula.
S_w=1-S_h
S_w=1-0.25
S_w=75%
S_w=0.75
S_w^2=\frac{FR_{mf}}{R{xo}}
FR_{mf}=S_w^2R_{xo}
F=\frac{S_w^2R_{xo}}{R_{mf}}
F=\frac{(0.75)^2\times1.30}{0.65}=\frac{0.7312}{0.65}=1.125
Tq sir.
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