Geology Reference
In-Depth Information
t
Match between salinity and ion-salt composition of water
mixes in these areas, and the mixing model of exactly these
ingredients (see Chapter 2).
This conclusion is further supported by petroleum geology data. They
indicate the presence in the Cenozoic interval of “epigenetic oil and gas
occurrence zone” replaced in the Mesozoic by the “syngenetic oil and gas
occurrence zone”, the genetic unity of all hydrocarbons in the sedimentary
section and by the presence in the Neogene reservoirs of oils with clear
filtrate features (Gazzarini
et al
., 1967; Kalinin
et al
., 1977).
5.2.1.3
The Viennese Depression
A number of factors based in the available hydrogeological information
eliminate the assumption of functioning in the region of the infiltration
waterhead system in its classical artesian version due to the discharge of
the bulk of infiltration agents directly in the piedmont zone and to seri-
ous tectono-lithological barriers for the flow of surface waters downdip the
beds.These factors include:
t
The presence of infiltrated fresh waters in the upper
(near-surface) section (down to 200-300 m) on local structures.
t
Rugged erosion topography and river system (the Danube,
Morava, Miava, Rudava, Russbach, Pulkau, Schmida and other
rivers) with strong denudation cut draining for this reason
substantial portion of the Piedmont zone Neogene section.
t
Numerous descending cold fresh water sources.
t
Step-block descending of reservoir intervals across the faults
from the flank zones to the center of the depression.
t
Contact between reservoirs and water-barriers across the
faults.
t
Separation of the central basin from the Piedmont zone be
lengthwise regional faults with the amplitude of 1.5-2 km.
Similar factors substantially restrict the likelihood of the formation
and active functioning in the depression of typical elision water-exchange
regime with the ground water flow from its center to the flank framework.
These factors are:
t
Graben-step structure defined by regional lengthwise
(Steinberg, Leopoldsdorf, Aderklaa and Lab-Shashtin) and
crosswise (Mulberg, Zisterdorf and Danube) faults.
