Geology Reference
In-Depth Information
14
1
2
13
12
1
2
11
10
9
8
7
6
5
4
3
2
1
110
Figure 2.15
South Caspian Depression. Ground water sulphate-ion content vs. formation
temperature in the flowing intervals:
1.
East flank,
2.
West flank.
0
50
60
70
80
90
100
t
, °C
the Balkhan zone of highs between 840 and 60 mg-equiv. (240-17.1 g/l).
It is characteristic that the salinity changes quite regularly (Figure 2.16;
Rachinsky, 1970).
Clear correlation between ground water depth and salinity indicates
the salinity association with geologo-physical environment in the specific
fields. Otherwise, it would be impossible to imagine a natural process of
sequential changes in the depositional basin's water salinity and ion-salt
composition, which would be subject to such strict pattern. It is even less
likely as the drastic changes in the ground water salinity and composition
occur not only in the entire Middle Pliocene section as a whole but often
in the section and over the area of a single formation deposited under the
unchanging environment.
The Balakhany-Sabunchi-Ramany Field is an example of vertical varia-
tions. There, the ground water salinity in the Sabunchi Fm. ranges between
