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Thermal history of the Carboniferous strata in the northern part of the Intra-Sudetic Basin (SW Poland): a combined Raman spectroscopy and organic petrography study

Botor Dariusz, Toboła Tomasz, Waliczek Marta

Acta Geologica Polonica

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2020

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Vol. 70, no. 3

363--396

EN

Raman spectroscopy and vitrinite reflectance measurements of dispersed organic matter from Carboniferous shales in boreholes in the northern part of the Intra-Sudetic Basin were used for thermal history reconstruction. Microscopic investigations have shown that the organic matter is dominated by the vitrinite maceral group. In analysed samples, organic matter shows a varied degree of thermal alteration determined by the mean random vitrinite reflectance (VRo) ranging from 0.72% to 3.80%. Mean apparent maximum vitrinite reflectance (R’max) values reached 4.98%. The full width at half maximum of D1 and G bands in Raman spectra are well-correlated with mean VRo and R’max. Thermal maturity in the boreholes shows a regular increase with depth. Geological data combined with Raman spectroscopy and mean vitrinite reflectance results indicate that the analysed Carboniferous strata reached maximum paleotemperatures from c. 110 to c. 265°C. The regional paleogeothermal gradient in the late Paleozoic was c. 80°C/km. The Variscan heating event presumably caused a major coalification process of organic matter. The Carboniferous–Permian magmatic activity must have contributed to high heat flow, adding to the effect of sedimentary burial on the thermal maturity.

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Petrologiczne rozpoznanie materii organicznej rozproszonej w sylurskich łupkach Gór Bardzkich (Sudety)

Nowak Grzegorz J.

Przegląd Geologiczny

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2019

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Vol. 67, nr 3

183--185

EN

The present paper is focused on the petrological characteristics of dispersed organic matter of the Silurian part of the Graptolite Shales from the Bardo Mts. (Sudetes). The most abundant organic component is secondarily altered organic matter represented by solid bitumen. Based on the results obtained by optical microscopy, it was possible to distinguish several types of solid bitumen. They were determined as granular, porous, coke-like, mosaic andfluidal types. All bitumen types are optically isotropic. Bitumen reflectance varies between 1.37 and 1.62%. Based on the % reflectance values, the solid bitumen identified in the studied samples are classified as pyrobitumen.

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Kilka uwag w sprawie badań materii organicznej w Państwowym Instytucie Geologicznym

Nowak Grzegorz

Przegląd Geologiczny

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2019

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Vol. 67, nr 6

461--464

EN

The inspiration to write this text was the article of Ewa Klimuszko (2019) on organic matter studies conducted in the Polish Geological Institute. This paper shortly reviews the history and present-day of coal and dispersed organic matter petrological studies conducted in the Polish Geological Institute. The focus of this review is on some aspects to coal petrology with respect to coal genesis as well as application of organic petrology to petroleum geology and to recognition ore mineralization processes. Futher possibilities of this research in the Polish Geological Institute have been mentioned.

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Rozpoznanie petrologiczne rozproszonej materii organicznej skał karbonu podłoża monokliny przedsudeckiej

Nowak G. J.

Przegląd Geologiczny

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2016

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Vol. 64, nr 12

1005--1007

EN

Intense program of shale gas prospecting in the territory of Poland is currently on going. Among the steps towards better examination of dispersed organic matter (DOM) in clastic Carboniferous rocks of the basement of the Fore-Sudetic Homocline are petrologic studies. The paper provides data on the DOM composition, kerogen type determination, and identification of thermal maturity degree of Carboniferous rocks in the basement of the Fore-Sudetic Homocline. In general, organic matter from the Carboniferous rocks is represented only by vitrinite and inertinite. Such composition of DOM permits to define it as humic organic matter typical for kerogen type III. Carboniferous rocks display a high and very high degree of thermal maturity, expressed by a wide range of vitrinite reflectance values (from below 1.50% to above 5.50%).

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Rozpoznanie petrologiczne i dojrzałość termiczna materii organicznej w utworach kambru, ordowiku i syluru na obszarach bałtyckim oraz podlasko-lubelskim

Grotek I.

Przegląd Geologiczny

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2016

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Vol. 64, nr 12

1000--1004

EN

The paper provides issues concerning dispersed organic matter in the lower Palaeozoic deposits of the Baltic and Podlasie-Lublin areas: its composition, genetic types, and thermal maturity degree. Organic matter in these rocks is represented by vitrinite-like material showing optical characteristics of vitrinite (bitumen/solid bitumens), phytoclasts and zooclasts (graptolite fragments). The UV light analysis commonly reveals a significant content of macerals from the liptinite group, represented mainly by well-preserved algae and alginite. The concentrations of organic matter varies from trace to 10% (Baltic area), and from trace to 9.20% (Podlasie Lublin area).The degree of thermal maturity of the Cambrian-Silurian deposits corresponds to the “oil and gas window”, with the average values of vitrinite-like reflectance index ranging from 0.52 to 2.03% Ro (Baltic area) and 0.75–2.09% Ro (Podlasie-Lublin area).

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Budowa petrograficzna lądowej materii organicznej we fliszu Karpat Zachodnich w Polsce

Zielińska M.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2010

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T. 36, z. 4

567-584

PL

Przedmiotem niniejszego opracowania jest budowa petrograficzna uwęglonej lądowej materii organicznej w skałach fliszu Karpat Zachodnich. W trakcie analizy petrograficznej materię organiczną podzielono na odmiany, mając na uwadze rozmiar szczątków organicznych. Materia organiczna reprezentowana jest przez DOM (Dispersed Organic Matter) i uwęglony detrytus roślinny. Ustalono, że zarówno DOM, jak i detrytus nie występują w skałach grubookruchowych, takich jak piaskowce gruboziarniste i zlepieńce. We wszystkich próbkach zawierających materiał węglowy dominuje grupa witrynitu, stanowiąca od 70% do 100% materii organicznej, przy udziale grupy inertynitu w zakresie od 0 do 30%. W trakcie badań próbek w świetle ultrafioletowym w żadnej nie stwierdzono macerałów grupy liptynitu. Największy udział w próbce całkowitego węgla organicznego TOC (ang. Total Organic Carbon) od 1.09% do 8.2%, wykazały warstwy krośnieńskie, grybowskie, formacja szczawnicka, beloweska i wierzowska. Wartości średniej refleksyjności witrynitu w poszczególnych jednostkach są do siebie zbliżone, choć w obrębie jednostek są silnie zróżnicowane i wyniosły odpowiednio: 0.39-0.62% w jednostce śląskiej, 0.38-0.71% w jednostce magurskiej i 0.42-0.67% w jednostce grybowskiej. Najwyższe wartości odnotowano w oknie tektonicznym Mszany Dolnej (0.67%) oraz w południowych partiach jednostki magurskiej (0.65-0.71%).

EN

The objective of this study was a petrographic analysis of terrestrial organic matter in the Western Flysch Carpathians. During the petrographic analysis, organic matter was divided with respect to the size of organic remains into two types. Organic matter is represented by the acronym DOM (Dispersed Organic Matter) and coalified detritus. It was found that both DOM and detritus do not occur in coarse grained rocks, such as coarse sandstones and conglomerates. Vitrinite is the dominant component in all samples, it constitutes 70% to 100% of the organic matter content, whereas the inertinite group makes up the remaining 0% to 30%. No exinite group macerals were detected during fluorescence microscope analysis. Krosno beds, Grybów beds, Szczawnicka, Beloveza and Verovice formation revealed the greatest contribution of TOC (Total Organic Carbon) in the sample, which was from 1.09% to 8.2%. The random mean vitrinite reflectance values in the individual units are similar and vary from 0.39 to 0.62% in the Silesian unit, 0.38% to 0.71% in the Magura unit and 0.42% to 0.67% in the Grybów unit. The highest values were observed in the Mszana tectonic window (0.67%) and in the southern parts of the Magura unit (0.65-0.71%).