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This article is devoted to the characteristics of dispersed organic matter in selected lithostratigraphic divisions of the Skole Unit in the area of the Polish fragment of the Carpathian Mountains. The aim of this research was to broaden the state of knowledge about the Skole Unit by aspects of organic matter petrography. Due to the size of the investigated area and the numerous lithostratigraphic divisions, the presented results should be treated as an introduction to the issue. The main emphasis is placed on microscopic analyses in reflected and UV light. Microscopic observations are enriched with the results of Rock-Eval pyrolytic analysis. The research material consisted of 37 rock samples collected from 3 selected regions. The samples represented various lithostratigraphic divisions – from Spas Shales, through Inoceramian Beds, Hieroglyphic Beds, Variegated Shales, up to Menilite and Krosno Beds. The analysed rocks are characterised by a variable content of organic matter from trace (Variegated Shales), through low (TOC up to 0.5% – Inoceramian, Hieroglyphic and Krosno Beds), to relatively high (Spas Shales and Menilite Beds). In the maceral composition, macerals from all 3 groups – vitrinite (collotelinite, vitrodetrinite), liptinite (alginite, bituminite, sporinite, liptodetrinite) and inertinite (fusinite, semifusinite, inertodetrinite) – are observed. The group of liptinite macerals dominates in samples within the Spas Shales and Menilite Beds, as well as in some of the shales from the Krosno Beds. In the case of Inoceramian and Hieroglyphic Beds, macerals of the vitrinite and inertinite groups predominate. In the Spas Shales and Krosno Beds, the dominant maceral within the liptinite group is alginite, while in Menilite Beds, bituminite dominates. Alginite is present in nearly all (except Variegated Shales) investigated lithostratigraphic divisions. The content of macerals of the inertinite group is higher than the content of macerals from vitrinite group in the Spas Shales, Inoceramian Beds and in some rocks from Hieroglyphic Beds. The situation is opposite in the case of Menilite and Krosno Beds. The organic matter within all the investigated rocks is in the phase of thermal changes referred to as immature, as evidenced by the Tmax parameter reaching values lower than 435oC. The examined rocks clearly differ in terms of the assessment of their hydrocarbon generation potential, which is the poorest for Variegated Shales and slightly better (but still poor) in the case of Inoceramian, Hieroglyphic and Krosno Beds. The best generation potential is observed in rocks collected from Spas Shales and Menilite Beds, with the latter having a generation potential defined as very good and even excellent.

Characteristics of dispersed organic matter in selected lithostratigraphic divisions within the Skole Unit (Carpathian Mts., SE Poland)