Geology Reference
In-Depth Information
Heat flow density (
q
) within the same depth range is (62.9-
134.3)
s, the same heat flow density normal-
ized for the base of PT-KT
q
PS(RS)
⋅
10
−
8
cal/cm
2
⋅
=
(8.95-21.5)
⋅
10
−
8
cal/
s/km (Table 11.3). For the PT in the Azerbaijan portion
of the basin the correlation
“temperature vs. depth”
within
the depth interval 0.05-8.5 km is
t
PS
=
13.7
cm
2
⋅
0.149
H
0.716
and
G
t
PS
- 3.51-0.82°C/100 m, for the КТ of the Turkmenistan
zone in the range of 0.05-7 km
t
RS
= 13.7
+
0.488
H
0.607
and
G
t
PS
- 6.27-0.91°C/100 m. The correlations
t
PS(RS)
=
f
(
H
) for
individual structures, anticlinal zones and areas are included
in Figures 4.3, 4.4.
t
A distinctive feature of the geothermal regime in the South
Caspian Basin is low heating of the Pliocene and Quaternary
sediments. In any areas of the basin
t
at the (
+
5) km subcrop
does not exceed 110°С and the
G
t
values are 0.80-1.05°С/100
m. In the adjacent basinаs (Fore-Caucasus, Plain Dagestan,
South Mangyshlak, East Turkmenistan and Central Iran)
these values at the same depths are: 160-180°С and
G
t
-
2.50-3.33
−
C/100 m.
t
Low heating of the Pliocene-Quaternary interval and spe-
cific temperature and its gradient distribution in depth are
caused by four major factors:
1. Non-stationary geothermal field in the Recent subsid-
ence areas and intense (sometimes avalanche) deposi-
tion. It means heat field distortion toward temperature
°
Figure 4.3
