At the time of logging, the resistivity of a 12 lbm/ gal drilling mud is measured with an instrument on the surface. A value of 1.78 m is obtained at a temperature of 90F.

a.What is the apparent salinity of the mud?

b.What is the estimated mud resistivity at a depth of 9,000 ft in the hole where the formation temperature is 190F?

c.Estimate the resistivities of the mud filtrate at 90 and 190F, respectively.

d.Can you justify the statistical approximation for predominantly NaCl muds:Rmf=0.75Rm?

e.Estimate the resistivity of the mudcake at 190F.

f.Can you justify the statistical approximation for predominately NaCl muds:Rmc=1.5Rm?

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