Page 234 - Petrophysics
P. 234
FORMATION RESISTIVITY FACTOR 207
In many cases, Rw is estimated using a logging tool, e.g., from the
spontaneous potential log. Chemical analysis of uncontaminated water
samples yields representative values of formation water resistivity as a
function of the salinity of the sample and reservoir temperature, using
Figure 4.4. Salinity is a measure of the connection of dissolved salts,
which is expressed in parts per million (ppm), grains per gallon, or
Figure 4.4. Resistivity of water as a function of salinity and temperature (courtesy
of Scblumberger Go.).
