Page 303 - Petrophysics 2E

274 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

and

F* = 8.86(1 + 1.14 x 0.30) = 11.8.

Values of Qv and F* for the seven core samples are included in
Table 4.12. The laboratory brine salinity and temperature (and
not salinity and temperature of the formation water at reservoir
conditions) were used to calculate F*. Subsequent calculations of
reservoir water saturation, however, require use of the formation
water salinity with its corresponding water resistivity and C,, values
at reservoir temperature [30].
(2) From a logarithmic plot of F* versus $ (Figure 4.44) one obtains
a curve-fit straight-line portion having a slope m* = 1.92 and

TABLE 4.12
VALUES OF Qv AND F" IN THE SHANNON SAND FIELD
Sample No. @ FRL CEC Qv F"

0.2 46.10 2.99 103.00 0.2 46.10
0.3 17.56 2.94 32.00 0.3 17.56
0.4 8.85 2.91 14.00 0.4 8.85
0.5 5.21 2.88 7.36 0.5 5.21
0.6 3.37 2.86 4.35 0.6 3.37
0.7 2.34 2.84 2.80 0.7 2.34
0.8 1.70 2.82 1.90 0.8 1.70
0.9 1.28 2.77 1.35 0.9 1.28

Figure 4.44. Formation resistivity factor for Shannon sand Wyoming 1321.