Geology Reference
In-Depth Information
2.1.3 The Viennese Basin
The ground waters in the region are alkaline and hard varieties. The for-
mer dominate the clastic Lower Miocene-Pliocene intervalе (Burdigalian,
Helvetian, Tortonian, Sarmatian and Pannonian Stages), and the latter are
typical of mostly flysh Paleogene-Upper Cretaceous deposits and folded
Mesozoic carbonates (Tables 2.10, 2.11).
The major waterhead complexes in the depression are Triassic-Jurassic,
Upper Cretaceous-Paleogene, Lower-Middle Miocene, Middle-Upper
Miocene and Pliocene. Regional water barriers are formed by clayey-
shaly-marly series of the Upper Jurassic, Lower Miocene clays (lower part
of the Burdigalian) and marly-clayey series of the Lower Sarmatian (Upper
Miocene).
Water flows from the
Triassic
dolomites and
Jurassic
limestones in the
internal nappes from commercial gas, condensate and oil fields. These
fields are Brittenlee, Strassow-Tief, Schonkirchen-Uber Tief, Reiersdorf
(Luntz and Frankenfels nappes) and the structures are Luxenberg, Lab,
Vysoka and Malazki (where productive intervals in the specified units are
not yet discovered). From the buried erosion highs in contact with Neogene
rocks water was produced in oil-bearing prospects Aderklaa, Baumgarten,
Matzen, Schonkirchen-Tief, Protes-Tief (the Otsscher nappe) and in the
Shashtin and Borsli-Yur areas. The former group of prospects has in both
intervals chlorine-calcium brines with the salinity 303.8
−
467.6 mg.-equiv.
(86.8
37%-equiv. The
latter group of prospects with the same chlorine-calcium water type (sec-
ondary salinity factor of up to 10%-equiv.) has substantially lower salinity
of 42.4
−
133.6 g/l) and secondary salinity factor about 22
−
18.6 g/l).
Ground waters from the
Upper Cretaceous-Paleogene
flysh were produced
at the Раg, Hesting, Prottes-Tief, Sankt-Ulrich-Hauskirchen, Pioneer-
Kreizfeld, Maustrenk-Scharfenek, Paasdorf, Matzen, Schonkirchen-Uber
Tief, Aderklaa, Schonfeld, Brittenlee and Himberg prospects. At the
Aderklaa and Раg prospects in the contact zone of the flysh erosion highs
with Miocene rocks are recorded hydrocarbonate-sodium waters with
salinity 26.1
−
65.3 mg.-equiv. (12.1
−
−
53.0 mg.-equiv. (7.5
−
15.1 g/l) and primary alkalinity factor
4.4
20.6%-equiv. Ground waters on all other structures are of the chlo-
rine-calcium type, secondary salinity factor 4.0
−
−
33%-equiv. and salinity
34.2
130 g/l). Minimum values of the said param-
eters are found in nonproductive areas of buried erosion highs and in the
zones of conducting faults connecting the flysh and Neogene intervals.
Maximum values are recorded in the internal parts of nappes where evap-
orite members and lenses are locally recorded (the Schonfeld, Brittenlee
and Himberg prospects: Agabekov, 1963; Dolenko, 1974; Reznikov, 1970;
−
455.0 mg.-equiv. (9.8
−
