Geology Reference
In-Depth Information
Figure 2.14 South Caspian Depression (Lower Kura Depression). Sulphate content
in ground water of the Productive Sequence and its primary alkalinity and secondary
salinity factors.
of pore water expulsion and bound water release from compacting clays
with increasing pressure and temperature (up to 16-20 mg-equiv. under
the thermobaric environment corresponding to depths of up to 12-15 km;
Kotov, Yermolayev and Fedotova, 1973).
We will now review the distribution of total ground water salinity in the
fields.
As noted above, ground water salinity decreases down the section in the
crestal areas in the fields of the South Caspian region. This phenomenon
is accompanied by a change in the water type from the chlorine-calcium
through the chlorine-magnesium and sulphate-sodium to the hydrocar-
bonate-sodium. The salinity values range in the Apsheron area between
800 and 30 mg-equiv. (228-68.6 g/l), in the Lower Kura Depression and
Baku Archipelago between 700 and 40 mg-equiv. (200-11.4 g/l), and in
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