FLYSCH VIENNA BASIN - TECTONICS, STRATIGRAPHY, LITHOFACIES, RESERVOIR PROPERTIES AND CLAY MINERALOGY OF THE RHENODANUBIC FLYSCH UNITS IN THE SUBCROP OF THE VIENNA BASIN
01/2011-12/2012: Funded by OMV Exploration and Production AG
Kurt Decker, Michael Wagreich, Susanne Gier
OMV PROJECT LEADERS:
Philipp Strauss, Ronald Peschl
Andrea Schicker, Stephanie Neuhuber, Omar Mohammed
Andreas Beidinger, Maria Hoprich
Raffaela Löffler, Doris Rupprecht
The project Flysch Vienna Basin will establish a stratigraphic, lithofacies and structural database for the Rhenodanubian Flysch units in the pre-Neogene basement of the Vienna Basin using an interdisciplinary approach with stratigraphy, sedimentology, structural geology, tectonics and sedimentary petrology techniques to achieve its goals. Research focuses on three items:
- The correlation of the Flysch units exposed in the Wienerwald area with the Vienna Basin subcrop. Correlations are based on stratigraphy and the construction of depth extrapolated cross sections through the Wienerwald area. The sections will be based on stratigraphic / lithologic reference sections of the main tectonic units, seismic and well data. The available data are supplemented by new data on biostratigraphy and petrology.
- Assessment of the reservoir properties of the Eocene Glaukonitsandstein Fm. (Greifenstein Fm.) forming the main reservoir within the Flysch units in the Vienna Basin subcrop. Production indicates that these sandstones behave in a complex manner combining properties of porous and fractured reservoirs. Flysch Vienna Basin therefore is scheduled to describe sandstone petrology, intergranular porosity / permeability and fracture porosity / permeability. The project results will also include outcrop-derived data on fracture density and fracture geometry.
- Data on the clay mineralogy and on the interaction between clay minerals in shale-rich lithostratigraphic units and drilling muds. Interlayering of shales and sands within the Flysch causes problems during drilling as the shales react with the drilling mud. The shales of selected lithostratigraphic units will be characterized with respect to clay mineralogy and the reaction of clay minerals with different drilling fluids, additives and inhibitors.