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An evaluation of organic matter dispersed in the Menilite Formation in Silesian Nappe (Polish Outer Carpathians): an optical microscopic approach

Waliczek Marta, Machowski Grzegorz, Solecki Marek Leszek, Stefaniuk Michał

Geology, Geophysics and Environment

2022

Vol. 48, no. 3

243--256

In this study, optical microscopic analyses were applied to evaluate the thermal maturity, characteristics of solid bitumen, and other organic matter finely dispersed in Oligocene shales of the Menilite Formation in the Iwonicz-Zdrój–Rudawka Rymanowska Fold (IRF) and Bóbrka–Rogi Fold (BRF) of the Central Carpathian Synclinorium of the Silesian Nappe, Outer Carpathians, Poland. The investigation was carried out at two-unit depths of the shallow and deeper D-1 sections (430 m – IRF and 4,300 m – BRF) and outcrop samples (BRF). The mean random huminite reflectance values indicate immature conditions with respect to hydrocarbon generation in samples from the D-1 shallow section (VRo ≈ 0.40%) and in the outcrop samples (VRo = 0.36%). The degree of thermal maturity of the organic matter from a depth of about 4,300 m – BRF based on random vitrinite (VRo ≈ 0.80%) and solid bitumen (BRo ≈ 0.65%) reflectance measurements is associated with the “oil window” for petroleum generation. The organic components dispersed in the examined Menilite Formation samples are typical for hydrocarbon-prone organic matter, suggesting the dominant kerogen type II. The potential precursor maceral for solid bitumen occurring in the examined samples from the deeper D-1 sections is largely the alginite maceral.

Materia organiczna rozproszona w ciemnych turbidytach górnego eocenu płaszczowiny śląskiej (Karpaty zewnętrzne, Polska)

Waliczek Marta, Waśkowska Anna, Machowski Grzegorz

Przegląd Geologiczny

2021

Vol. 69, nr 7

458--462

In this study, weapply microscopic analysis to evaluate thematurity of organic matter and characterise the macerals dispersed in the Upper Eocene shale samples from the Hieroglyphic Formation (Silesian Nappe, Outer Carpathians). The mean vitrinite reflectance values indicate the presence of organic matter immature to hydrocarbon generation (Ro≈0.43%).The main organic component dispersed in analysed samples is vitrinite, characteristic of kerogen type III.