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a
400
File Name: 30cen
300
200
100
0
2
4
6
8 10 12 14 16
Number of Wells
18 20 22 24 26 28 30
b
180
File Name: ceno3
160
140
120
100
80
60
40
20
0
2
4
6
8
10 12 14 16
Number of Wells
18 20 22 24 26 28
Fig. 9.17 Cumulative fossil event frequency distributions for Cenozoic Foraminifera and other
microfossil events within North Sea Basin (a) and along northwestern Atlantic margin (b). The
RASC threshold parameter for Minimum Number of Sections (MNS) was set equal to six and
seven for datasets (a) and (b), respectively (Source: Agterberg et al.
2013
, Fig. 4)
curves are “hollow” because relatively many events are observed in one or a few
exploratory wells only. By means of the chi-square test for goodness of fit,
Agterberg and Liu (
2008
) have shown that the frequencies for dataset (A) satisfy
the logarithmic series distribution model (see Sect.
2.2.4
). The frequencies shown
in Fig.
9.17
are also the marginal frequencies of the two-dimensional frequency
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