Geology Reference
In-Depth Information
fields) (Gorin and Buniat-Zadeh, 1971; Durmishyan, Zulfugarov and
Rachinsky, 1970; Durmishyan, Muradian and Rachinsky, 1974; Potapov,
1954).
5.2.1.2
he Padan Depression
The geo-fluid-dynamic environment in the region is manifested by several
factors:
t
By a system of large-throw lengthwise faults fringing
the Alps and Apennine slopes facing the depression and
separating these mountain ranges from its main subsided
portion.
t
By the presence in the Cenozoic interval of strong lithologi-
cal, stratigraphic and formational unconformities associated
with alternations with transgressive and regressive deposi-
tion cycles.
t
By lens-shaped nature of clastic reservoir members.
t
By step-block structure. It is defined by sequential subsidence
of individual sequences on the system of inter-basinal cross-
cutting faults in the direction from the Alps, Apennines and
Ferrara high to the axial zone of the Alpine and Apennine
foredeeps/troughs.
t
By a drastic decline in Mesozoic carbonates' permeability
outside of local structures and down the regional slope.
All of these indicate low likelihood of the currently functioning in
the Padan depression either infiltration water-exchange (ground water
flow from its periphery to the center) or oppositely directed elision
water-exchange.
The major form of fluid-mass transfer in the region is vertical ground
water migration through a system of faults It includes the Triassic-Neogene
stratigraphic range. That is predetermined by:
t
Spatial hydrochemical zoning (see Chapter 2).
t
The association between the Cenozoic commercial
hydrocarbon saturation and manifestations of injected
high-salinity Mesozoic chlorine-calcium water against a
low-salinity hydrocarbonate-sodium regional background
(see Chapter 6).
