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Gas accumulations in Oligocene–Miocene reservoirs in the Alpine Foreland Basin (Austria): evidence for gas mixing and gas degradation

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Abstract

Two petroleum systems are present in the eastern (Austrian) sector of the Alpine Foreland Basin. Whereas oil and thermogenic gas in Mesozoic and Eocene reservoir rocks have been generated beneath the Alps in Lower Oligocene source rocks, relative dry gas in Oligocene–Miocene clastic rocks deposited in the deep marine basin-axial channel system (Puchkirchen Channel) is interpreted as microbial in origin. Detailed investigations of the molecular and isotope composition of 87 gas samples from 86 wells, representing all producing fields with Oligocene and Miocene reservoir rocks, suggest that the presence of pure microbial gas is rare and limited mainly to the northern basin flank (e.g., KK field). All other fields contain varying amounts of thermogenic gas, which has been generated from a source rock with oil-window maturity. A relation with the underlying thermogenic petroleum system is obvious. Upward migration occurred along discrete fault zones (e.g., H field) or through low-permeability caprocks. Local erosion of Lower Oligocene sediments, the principal seal for the thermogenic petroleum system, as well as a high percentage of permeable rocks within the Puchkirchen Channel favored upward migration and mixing of thermogenic and microbial gas. All gas samples in Oligocene–Miocene reservoirs are biodegraded. Biodegradation and the formation of secondary microbial gas resulted in gas drying. Therefore, the gas samples analyzed in this study are relative dry, despite significant contributions of thermogenic hydrocarbons. Biodegradation probably continues at present time. The degree of biodegradation, however, decreases with depth.

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Acknowledgements

The presented data were obtained within the frame of FFG bridge Project 836527 between Montanuniversitaet Leoben and Rohöl-Aufsuchungs AG. The authors would like to thank Rohöl-Aufsuchungs AG for access to samples, geological documentation and publication permission. Fruitful discussion with Werner Tschelaut, Wilma Troiss, Alan Reingruber and Lorenz Scheucher (Rohöl-Aufsuchungs AG), Marie-Louise Grundtner (Montanuniversitaet Leoben), Andrea Gruner (GFZ German Research Centre for Geosciences), Heinz Wilkes (Oldenburg University) improved this paper. The article was improved considerably by review of Dr. Gabor C. Tari and anonymous reviewer.

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  1. Department Applied Geosciences and Geophysics, Chair of Petroleum Geology, Montanuniversitaet, Peter-Tunner-Strasse 5, 8700, Leoben, Austria

    L. Pytlak, D. Gross, R. F. Sachsenhofer & A. Bechtel

  2. Rohöl-Aufsuchungs AG, Schwarzenbergplatz 16, 1015, Vienna, Austria

    H.-G. Linzer

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  1. L. Pytlak
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Pytlak, L., Gross, D., Sachsenhofer, R.F. et al. Gas accumulations in Oligocene–Miocene reservoirs in the Alpine Foreland Basin (Austria): evidence for gas mixing and gas degradation. Int J Earth Sci (Geol Rundsch) 106, 2171–2188 (2017). https://doi.org/10.1007/s00531-016-1421-1

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