Page 207 - Petrophysics

180 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

TABU 3.13
FREQUENCY DISTRIBUTION FOR THE PERMEABlLlN DATA
Cumulative
Number of Samples Frequency
Core Permeability With Larger Distribution
No. k, md Frequency Permeability (% >ki)

6 4400 1 0 0.0
31 3200 1 1 3.4
35 2200 1 2 6.9
32 2100 1 3 10.3
5 1920 1 4 13.8
23 1560 1 5 17.2
28 1180 1 6 20.7
12 410 1 7 24.1
38 370 1 8 27.6
20 330 1 9 31.0
4 220 1 10 34.5
15 200 1 11 37.9
10 145 1 12 41.4
40 130 1 13 44.8
39 115 1 14 48.3
22 98 1 15 51.7
1 90 1 16 55.2
37 88 1 17 58.6
17 70 1 18 62.1
16,25 36 2 19 65.5
11 25 1 21 72.4
36 19 1 22 75.9
34 18 1 23 79.3
14 9 1 24 82.8
33 8 1 25 86.2
2 7 1 26 89.7
3 4 1 27 93.1
13 3 1 28 96.6
Total samples, n = 29

PERMEABILITY FROM WELL TEST DATA

Despite the considerable value of core analysis and well log
interpretation, some doubt always remains concerning the potential
productivity of a well, especially during the exploratory stage. This
doubt is not dispelled until a sizable sample of formation fluids has been
recovered during a production test, commonly known as drill-stem test.