Source rock potential of the oligocene menilite formation in the czech sector of the subsilesian unit (Flysch Carpathians)

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External Organisational units

  • Masaryk University
  • Institute of Plasma Physics, Academy of Sciences of the Czech Republic
  • Czech Geological Survey, Prague

Abstract

The Oligocene Menilite Formation represents the most important hydrocarbon source rock in the Flysch Carpathians. The formation is laterally uniform across long distances but shows strong vertical heterogeneity reflecting changes in depositional environments, which control the source rock potential. In the Czech Republic, the Menilite Formation is subdivided into the Subchert Member (nannofossil zone NP22), Chert Member (upper NP22 to lower NP23), Dynów Marlstone (NP23) and Šitbořice Member (upper NP23 to lower NP25). The present study describes in detail the Bystřice nad Olší section in the Subsilesian Unit where all four members are exposed including the uppermost part of the underlying Frýdlant Formation (Sheshory Marls). The present Frýdlant Formation has a negligible source rock potential compared to the Menilite Formation. The Menilite Formation in the Bystřice nad Olší section has mostly “good” source rock potential, although the TOC indicates “very good” potential. The Subchert Member (average TOC: 3.6 wt. %; HI up to 505 mg HC/g TOC) and the Chert Member (average TOC: 2.2 wt. %; HI up to 790 mg HC/g TOC) are the most prolific units. Based on organic petrography and HI, the kerogen is classified as type II and I. Indications of admixtures of type III kerogen are limited to samples with low TOC contents

Details

Original languageEnglish
Pages (from-to)402-417
Number of pages16
JournalGeologica Carpathica
Volume71.2020
Issue number5
DOIs
Publication statusPublished - Oct 2020