Variations of yields and molecular and isotopic compositions in gases generated from Miocene strata of the Carpathian Foredeep (Poland) as determined by hydrous pyrolysis

Hydrous pyrolysis (HP) experiments at 330 and 355 °C for 72 h have been performed to simulate gas generation and expulsion, and to evaluate the yields of hydrocarbon and non-hydrocarbon components of thermogenic gases generated and expelled from shales of the Miocene strata of the Polish Outer Carpa...

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Bibliographic Details
Published in:International journal of earth sciences : Geologische Rundschau 2022-09, Vol.111 (6), p.1823-1858
Main Authors: Kotarba, Maciej J., Bilkiewicz, Elżbieta, Bajda, Tomasz, Waliczek, Marta, Jurek, Krzysztof
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbonates
Chemical bonds
Composition
Decarboxylation
Decomposition
Earth and Environmental Science
Earth Sciences
Expulsion
Gases
Geochemistry
Geology
Geophysics/Geodesy
Hydrocarbons
Hydrogen
Hydrogen sulfide
Inorganic compounds
Isotope composition
Isotopes
Kerogen
Mineral Resources
Miocene
Nitrogen
Organic matter
Original Paper
Pyrolysis
Reflectance
Sedimentology
Shales
Strata
Structural Geology
Sulfur
Sulfur isotopes
Sulphur
Yields
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Summary:Hydrous pyrolysis (HP) experiments at 330 and 355 °C for 72 h have been performed to simulate gas generation and expulsion, and to evaluate the yields of hydrocarbon and non-hydrocarbon components of thermogenic gases generated and expelled from shales of the Miocene strata of the Polish Outer Carpathian Foredeep (POCF). Mechanisms of thermogenic gas generation and expulsion were established based on the results of Rock–Eval, vitrinite reflectance R o and δ 13 C of organic matter and mineralogical analyses of the matrix of original shales and shales after HP experiments, as well as the yields, molecular and stable carbon, hydrogen, nitrogen and sulphur isotope compositions of gases generated during HP. The analysed Miocene immature dispersed organic matter in clayey–muddy deposits is mainly type III kerogen. The yield of methane generated from shales of the Lower and Upper Badenian Skawina Formation in the western sector of POCF is higher than that the Upper Badenian and Lower Sarmatian strata of the eastern sector. A partial isotopic reversal of δ 13 C 1  
ISSN:1437-3254
1437-3262
DOI:10.1007/s00531-022-02206-0