Abstract. The northern Upper Rhine Graben is due to its tectonic setting and the
positive geothermal anomaly a key region for geothermal heat and power
production in Europe. In this area the Upper Eocene to Lower Oligocene
Pechelbronn Group reaches depths of up to 2800 m with temperatures of
locally more than 130 ∘C. In order to assess the hydrothermal
potential of the Pechelbronn Group a large dataset is compiled and evaluated.
Petrophysical parameters are measured on core samples of eight boreholes
(courtesy of Exxon Mobil). Additionally, 15 gamma-ray logs, 99 lithology logs
as well as more than 2500 porosity and permeability measurements on cores of
some of these boreholes are available. The Lower Pechelbronn Beds are composed of fluvial to lacustrine sediments,
the Middle Pechelbronn Beds were deposited in a brackish to marine
environment and the Upper Pechelbronn Beds consist of fluvial/alluvial to
marine deposits. In between the western and eastern masterfaults of the
Upper Rhine Graben several fault blocks exist, with fault orientation being
sub-parallel to the graben shoulders. During the syntectonic deposition of
the Pechelbronn Group these fault blocks acted as isolated depocenters,
resulting in considerable thickness and depositional facies variations on
the regional and local scale (few tens to several hundreds of meters). Laboratory measurements of sonic wave velocity, density, porosity,
permeability, thermal conductivity and diffusivity are conducted on the core
samples that are classified into lithofacies groups. Statistically evaluated
petrophysical parameters are assigned to each group. The gamma-ray logs
serve to verify the lithological classification and can further be used for
correlation analysis or joint inversion with the petrophysical data. Well data, seismic sections, isolines and geological profiles are used to
construct a geological 3-D model. It is planned to use the petrophysical,
thermal and hydraulic rock properties at a later stage to parametrize the
model unit and to determine, together with the temperature and thickness of
the model unit, the expected flow rates and reservoir temperatures and thus
the hydrothermal potential.
Wie in anderen Alpenregionen auch, erfolgt die Trinkwasserversorgung in den Zillertaler Alpen vorwiegend privat oder in Genossenschaften aus nahe gelegenen Quellen, typischerweise mit kleinen Einzugsgebieten. Durch eine Veränderung der österreichischen Trinkwasserverordnung wurde der Arsengrenzwert von 50 µg/l auf 10 µg/l herabgesetzt, wodurch Quellwässer vielerorts nicht mehr den Anforderungen genügen. Es sind Maßnahmen zur Einhaltung des Grenzwertes herbeizuführen. In dieser Studie werden Ergebnisse der Stichtagsbeprobung des Zemmbacheinzugsgebietes auf einer Gesamtfläche von 225 km 2 vorgestellt. Binnen elf Tagen wurden 135 Quellen und Oberflächengewässer beprobt. Die Untersuchungen dienten der Auswahl alternativer Quellen anhand trinkwasserrechtlich relevanter Kennwerte mit Fokus auf Arsen und Uran. In einigen Teilen des Untersuchungsgebietes variiert die Grundwasserbeschaffenheit aufgrund diverser Wechsel petrographischer Einheiten kleinräumig. Das angewendete Konzept einer Stichtagsbeprobung ist gut dazu geeignet, einen weiträumigen Überblick der Grundwasserbeschaffenheit zu erhalten und Quellen zur Ergänzung oder Ersetzung der lokalen Wasserversorgung zu identifizieren. Diese Quellen sind intensiver zu beobachten, um letztlich mittels Zeitreihen Entscheidungen zu treffen.
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