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Abstract

AAPG Bulletin, V. 98, No. 10 (October 2014), P. 19671994.

Copyright copy2014. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/02211413049

Occurrence of Upper Jurassic–Lower Cretaceous black organic-rich pelitic sediments as targets for unconventional hydrocarbon exploration in the Outer Carpathians and adjacent part of the Alps

Andrzej Ślączka,1 Jan Golonka,2 Nestor Oszczypko,3 Marek Cieszkowski,4 Tadeusz Słomka,5 and Irena Matyasik6

1Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-376 Kraków, Poland; [email protected]
2Akademia Górniczo-Hutnicza University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Mickiewicza 30, 30-059, Kraków, Poland; [email protected]
3Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-376 Kraków, Poland; [email protected]
4Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-376 Kraków, Poland; [email protected]
5AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Mickiewicza 30, 30-059, Kraków, Poland; sł[email protected]
6Oil And Gas Institute, ul. Lubicz 25a, 31-503, Kraków, Poland; [email protected]

ABSTRACT

Our work on the dark pelitic sediments of the Polish Carpathians and eastern Alps shows that these Jurassic through Lower Cretaceous sediments owe their organic content to a combination of global processes, such as climatic changes and changes to the carbonate compensation depth (CCD), and local controls, such as basin morphology, input of terrestrial organic material, and local volcanic activity. These sediments developed in basins both floored by oceanic crust as well as within the continental crust (North European platform). Our data show that these anoxic or poorly oxygenated deposits (average total organic carbon [TOC] value is around 2.5 wt. %) were laid down in the individual basins at different times, from the Late Jurassic to the Barremian and almost continuously up to the early Cenomanian, a period of 30 to 50 m.y., and their thickness reached hundreds of meters. This long time span made it impossible to distinguish precisely the known Aptian and Albian oceanic anoxic events (OAE). Our data show that sedimentation of dark organic-rich deposits was not only controlled by global events such as climatic and CCD changes, but also by local ones as a result of differences in their basin morphology and development, input of land-plant detritus, and local volcanic activity. As an example of the anoxic succession, a detailed description of the black sediments of the proto-Silesian basin is presented. Some of these anoxic shales were buried to a depth of a few thousand meters during the folding and overthrusting movements. We propose that these shales could represent a unique shale-oil and shale-gas resource in an intensely structured basin.

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