Page 205 - Petrophysics 2E

178 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

32 30 28 26 24 22 20 18 16 14 12 10 8
Porosity, %
Figure 3.52. Distribution of porosity capacity.

TABLE 3.12
CALCULATION OF POROSIN DISTRIBUTION FROM CLASSIFIED DATA FOR
DETERMINATION NET PAY SAND
OF
Mid- Cumulative
value Frequency capacity,
Porosity of range, No. of Fraction, n
Range %, $i samples Fi Qi Fi !?$!
Qt
i=l
Less than 10 9 1 0.0345 0.31 0.01 1 .oo
10-12 11 0 0.0000 0.00 0.00 0.99
12-14 13 1 0.0345 0.45 0.02 0.99
14- 16 15 3 0.1034 1.55 0.07 0.96
16-18 17 4 0.1379 2.34 0.11 0.89
18-20 19 8 0.2759 5.24 0.25 0.78
20-22 21 1 0.0345 0.72 0.03 0.53
22-24 23 1 0.0345 0.79 0.04 0.49
24-26 25 3 0.1034 2.59 0.12 0.45
26-28 27 3 0.1034 2.79 0.13 0.33
28-30 29 2 0.0690 2.00 0.10 0.20
30+ 31 2 0.0690 2.14 0.10 0.10
Totals 29 1.0000 20.9310