Evaluation of the Gas Content in Archived Shale Samples: A Carbon Isotope Study

We examined 14 archived samples of shale for the chemical and 13C isotopic composition of residual gases produced as part of rock-crushing operations at a hammer mill. Results were compared with data on maturity from Rock-Eval pyrolysis and vitrinite reflectance measurements. The samples originated...

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Bibliographic Details
Published in:Geosciences (Basel) 2019-11, Vol.9 (11), p.481
Main Authors: Frantisek, Buzek, Eva, Gerslova, Milan, Gersl, Bohuslava, Cejkova, Ivana, Jackova, Zdena, Lnenickova
Format: Article
Language:English
Subjects:
Carbon
Carbon isotopes
Chemical composition
diffusion
Earth science
Ethane
Evaluation
Fractionation
Gases
Hammer mills
Hydrocarbons
Isotope composition
Isotope fractionation
Isotope studies
Isotopes
Mathematical analysis
Methane
Natural gas
Pyrolysis
Reflectance
Rocks
Sedimentary rocks
Shale
Shale gas
shale gases
Shales
Silurian
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Summary:We examined 14 archived samples of shale for the chemical and 13C isotopic composition of residual gases produced as part of rock-crushing operations at a hammer mill. Results were compared with data on maturity from Rock-Eval pyrolysis and vitrinite reflectance measurements. The samples originated from three different formations (Mikulov Marls, Ostrava Formation, and Liteň Formation) located in the Czech Republic. For comparison, we examined a gas-prone shale sample from the Polish Silurian. We used changes in the chemical and isotopic composition of released gases to evaluate the isotope fractionation during gas loss and retroactively calculated the initial content of gas in the shale samples. The gas content estimates (in L of gas per ton of rock) correspond with the maturity parameters of the shales. Calculated isotope fractionation for the gas release was −3‰ for both methane and ethane. The archived samples primarily lost methane (up to 90%), with subsequent changes in the content of ethane and higher hydrocarbon levels.
ISSN:2076-3263
2076-3263
DOI:10.3390/geosciences9110481