Geology Reference
In-Depth Information
P
res
, MPa
0
10
20
30
40
50
60
70
80
90 100
110
120 130
500
Konkian, Karaganian
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
H, m
Figure 3.11
Initial formation pressure in waterhead complexes of Tersk-Caspian
Trough. Fields, prospects:
Sunzha anticlinorium: 1.
Zamankul,
2.
Karabulak-Achaluki,
3.
Starogroznenskoye,
4.
Sernovodskoye,
5.
Oktyabrskoye;
Tersk Anticlinorium:
6.
Malgobek-Voznesenskoye,
7.
Orlinoye,
8.
Eldarovskoye,
9.
Khayan-Kort,
10.
Braguny,
11.
Andreyevskoye,
12.
Mineralnoye,
13.
Gudermes,
14.
W.Gudermes,
15
.N. Malgobek,
16.
Alkhazovo,
17.
Yastrebinaya,
18.
Gorskaya,
19.
N.Mineralnoye;
Terek zone of highs:
20.
Pravoberezhnaya
,
21.
Burunnaya,
22.
Chervlennaya; Chernogor
Monocline
:
23.
Zmeyskaya,
24.
Datykh.
Chokrackian
Maikopian
Foraminifera beds
Up. Eocene
Jurassic
L. Cretaceous
Triassic
the Upper Cretaceous reservoir between various parts of the Malgobek-
Voznesensk structure is 270 to 500 m (Volobuyev, 1986; Durmishyan,
Muradian and Rachinsky, 1974; Kortsenshtein, 1970).
The actual data indicate more differentiated vertical AHFP distribution
compared with the Indolo-Kuban Trough. The Triassic-Lower Cretaceous
interval displays lower abnormality factor values (on the average 1.45) than
in the overlying Upper Cretaceous -Middle Miocene sequence where it is
1.61. The highest average factors are recorded in the Upper Cretaceous and
Oligocene-Lower Miocene (Maikopian) complexes (correspondingly 1.71
and 1.92; see Table 3.7, Figure 3.11).
When estimating quoted data, it is necessary to keep in mind that the
abnormality factor value, 1.45 for the Triassic-Lower Cretaceous intervals,
is the average including the 1.20 value based on a single formation pressure
measurement in the Triassic sediments (Zaterechny District, Burunnaya
