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

Published online by Cambridge University Press:  09 July 2018

S. Gier
S. Gier*
Affiliation:
Institute of Petrology, University of Vienna, Althanstraûe 14, 1090 Vienna, Austria
*
*E-mail: susanne.gier@univie.ac.at
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Abstract

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

AustriadiagenesisFischschiefer formationillite-smectiteMolasse Basinorganic mattervitrinite reflectance
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 4 , September 2000 , pp. 709 - 717
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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