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Effect of shale properties on CH4 and CO2 sorption capacity in Czech Silurian shales
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SYSNO ASEP 0532106 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of shale properties on CH4 and CO2 sorption capacity in Czech Silurian shales Author(s) Řimnáčová, Daniela (USMH-B) ORCID, SAI
Weishauptová, Zuzana (USMH-B) RID, ORCID
Přibyl, Oldřich (USMH-B) RID
Sýkorová, Ivana (USMH-B) RID, ORCID
René, Miloš (USMH-B) RID, ORCID, SAIArticle number 103377 Source Title Journal of Natural Gas Science and Engineering. - : Elsevier - ISSN 1875-5100
Roč. 80, AUG 2020 (2020)Number of pages 12 s. Publication form Online - E Language eng - English Country GB - United Kingdom Keywords silurian shales ; sorption capacity ; carbon dioxide ; methane ; organic and inorganic components ; porosity Subject RIV DD - Geochemistry OECD category Geology Method of publishing Limited access Institutional support USMH-B - RVO:67985891 UT WOS 000549567300006 EID SCOPUS 85085627861 DOI 10.1016/j.jngse.2020.103377 Annotation The study involved an experimental assessment of the CO2 and CH4 sorption capacity of seven dark Silurian shale samples from three formations in the Barrandian Basin (Czech Republic). The shale samples had dominant inorganic matter consisting mainly of clay minerals, quartz, calcite and plagioclase, and very low organic matter. Most of the organic particles were the remains of zooclasts, especially graptolites and bitumens. The graptolite reflectance (R-r) reflecting the degree of thermal maturation of the shales ranges between 0.56% in the Kopanina Formation and 1.09% in the Litohlavy Formation, with the exception of the probably thermally altered part of the Motol Formation, which has reflectance higher than 1.70%. The total organic carbon (TOC) content was found to be in the range of 0.34-2.37 wt%. The porosity values were from 4.6% to 18.8%. In all shale samples, the high pressure excess sorption isotherms of CO2 and CH4 were measured at a temperature of 45 degrees C for both gases at pressures up to 8 MPa for CO2 and up to 15 MPa for CH4 on dry samples, using a manometric sorption apparatus. The Gibbs equation was used for evaluation of the maximum excess sorption (n(max, CO2) and n(max,CH4)). The n(max, CO2) values ranged from 0.118 mmol/g to 0.244 mmol/g, while the n(max, CH4) values were more than twice lower (0.050 mmol/g - 0.088 mmol/g). The x(CO2/CH4) ratio ranged from 1.47 to 2.98, with a median value of 2.54, calculated without the sample from the Kopanina Formation (4.36). The influence of the shale parameters on the CO2 and CH4 sorption capacity was determined. No relation has been proven between the value of R-r and the TOC-normalized CO2 and CH4 sorption capacities. The CO2 sorption capacity showed a negative correlation with TOC and with clay minerals but a positive correlation with quartz, while the behaviour of CH4 was opposite in these cases. A strong positive correlation was found between the volume of micropores and the CO2 excess sorption capacity, and negative dependence was found for CH4. The CO2 sorption capacities always depend on the micropores content, and the CH4 capacities depend on the shale components. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S1875510020302316?via%3Dihub
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