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Open AccessArticle

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

1
Czech Geological Survey, 118 21 Prague 1, Czech Republic
2
Department of Geological Sciences, Masaryk University, 601 77 Brno, Czech Republic
3
Faculty of Agronomy, Mendel University in Brno, 613 00 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(11), 481; https://doi.org/10.3390/geosciences9110481
Received: 19 September 2019 / Revised: 12 November 2019 / Accepted: 14 November 2019 / Published: 15 November 2019
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. View Full-Text
Keywords: shale gases; carbon isotopes; chemical composition; diffusion shale gases; carbon isotopes; chemical composition; diffusion
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Frantisek, B.; Eva, G.; Milan, G.; Bohuslava, C.; Ivana, J.; Zdena, L. Evaluation of the Gas Content in Archived Shale Samples: A Carbon Isotope Study. Geosciences 2019, 9, 481.

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