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Clay mineral and organic diagenesis of the Lower Oligocene Scho ¨neck Fishshale, western Austrian Molasse Basin

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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 m 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

Document Type: Research Article

DOI: https://doi.org/10.1180/000985500547151

Publication date: 2000-09-01

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