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Clay Minerals; September 2000; v. 35; no. 4; p. 709-717
© 2000 Mineralogical Society of Great Britain and Ireland
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Research Paper

Clay mineral and organic diagenesis of the Lower Oligocene Schöneck Fishshale, western Austrian Molasse Basin

S. GIER*

Institute of Petrology, University of Vienna, Althanstraße 14, 1090 Vienna, Austria

* E-mail: susanne.gier{at}univie.ac.at

(Received 28 September 1999; revised 28 February 2000)

The ‘Fischschiefer formation’ has been identified as the likely source rock for petroleum in the western Molasse Basin of Austria. The investigated cores originate from different depths (1242 m to 4294 m) of the Fischschiefer horizon. The illitization observed in the <0.2 µm fraction proceeds slowly, probably because of the low geothermal gradient (3°C/100 m) in the Molasse Basin. The illite content in illite-smectite ranges from 30% (randomly ordered) for the shallowest sample to 65% (R0+R1 ordering) for the deepest sample. The oxygen index (OI) vs. hydrogen index (HI) plot implies type I to II kerogen for the organic matter. Vitrinite reflectance and Rock Eval parameters indicate an immature stage in the diagenesis of kerogen. Only the deepest sample (4294 m, 0.6% Rr) reaches the early oil window. There is a good correlation of the illitization trend of the mixed-layer mineral I-S and the organic maturity parameters.

KEYWORDS: Austria, diagenesis, Fischschiefer formation, illite-smectite, Molasse Basin, organic matter, vitrinite reflectance




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J. AROSTEGUI, F. J. SANGUESA, F. NIETO, and J. A. URIARTE
Thermal models and clay diagenesis in the Tertiary-Cretaceous sediments of the Alava block (Basque-Cantabrian basin, Spain)
Clay Minerals, December 1, 2006; 41(4): 791 - 809.
[Abstract] [Full Text] [PDF]


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