64
Statistical Methods for Estimating Petroleum Resources
0
0
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1000 2000 3000
Value
Value
Frequency
Frequency
Frequency
Frequency
Value
Value
4000 5000 6000 7000
0
0
10
20
30
40
50
A
C
20 40 60 80 100 120 140
2 Ϫ7
0
10
20
30
40
50
2 Ϫ3
2 1
2 5
2 9
2 13
2 Ϫ7
0
10
20
30
40
50
2
Ϫ5 2 Ϫ3 2 Ϫ1 2 1
2 3
2 5
2 7
B
D
Figure 4.1. (A–D) J-shaped histograms of the lognormal population (A) and
Weibull population (C) plotted on a linear scale. Bell-shaped histograms of the
lognormal population (B) and Weibull population (D) plotted on a logarithmic
scale (base 2).
Statistical Methods for Estimating Petroleum Resources
0
0
10
20
30
40
50
1000 2000 3000
Value
Value
Frequency
Frequency
Frequency
Frequency
Value
Value
4000 5000 6000 7000
0
0
10
20
30
40
50
A
C
20 40 60 80 100 120 140
2 Ϫ7
0
10
20
30
40
50
2 Ϫ3
2 1
2 5
2 9
2 13
2 Ϫ7
0
10
20
30
40
50
2
Ϫ5 2 Ϫ3 2 Ϫ1 2 1
2 3
2 5
2 7
B
D
Figure 4.1. (A–D) J-shaped histograms of the lognormal population (A) and
Weibull population (C) plotted on a linear scale. Bell-shaped histograms of the
lognormal population (B) and Weibull population (D) plotted on a logarithmic
scale (base 2).