KS Consider a shale-free, dry, sandstone core plug. By measure-
ment, the following data are known: d=2.54 cm, L=5.00 cm,
and mass (dry) =54.8 g.
a. Knowing that the grain density of most sandstones is about
2.65 g/cm³, estimate the porosity of the core plug.
b. The plug is completely saturated with 145,000-ppm NaCl
brine whose specific gravity is 1.1. The mass of the satu-
rated core plug is now 60.38 g. Calculate the porosity of
c. Estimate the end-to-end resistance of the saturated core plug
in 12 at 80°F.
d. By actual measurement, the end-to-end resistance of the
plug is 83.3 2. Calculate the Ro value of the plug.
e. Some of the brine is removed from the core plug; i.e., the
core is partially desaturated. Its mass is now 57.03 g. Cal-
culate the water saturation.
f. For an exponent n of 2, what would be the end-to-end
resistance of the core and its true resistivity?
1 6 a Calculate the more of N.
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