Bedrock instability of underground storage systems in the Czech Republic, Central Europe

0463219 - ÚSMH 2017 RIV CN eng J - Článek v odborném periodiku
Nováková, Lucie - Brož, Milan - Záruba, J. - Sosna, K. - Najser, J. - Rukavičková, L. - Franěk, J. - Rudajev, V.
Bedrock instability of underground storage systems in the Czech Republic, Central Europe.
Applied Geophysics. Roč. 13, č. 2 (2016), s. 315-325. ISSN 1672-7975. E-ISSN 1993-0658
Grant CEP: GA MPO(CZ) FR-TI1/367
Institucionální podpora: RVO:67985891 ; RVO:67985530
Klíčová slova: underground storage * instability * seismicity * Bohemian Massif
Kód oboru RIV: DD - Geochemie
Impakt faktor: 0.796, rok: 2016

Underground storage systems are currently being used worldwide for the geological storage of natural gas (CH4), the geological disposal of CO2, in geothermal energy, or radioactive waste disposal. We introduce a complex approach to the risks posed by induced bedrock instabilities in deep geological underground storage sites. Bedrock instability owing to underground openings has been studied and discussed for many years. The Bohemian Massif in the Czech Republic (Central Europe) is geologically and tectonically complex. However, this setting is ideal for learning about the instability state of rock masses. Longterm geological and mining studies, natural and induced seismicity, radon emanations, and granite properties as potential storage sites for disposal of radioactive waste in the Czech Republic have provided useful information. In addition, the Czech Republic, with an average concentration radon of 140 Bq m(-3), has the highest average radon concentrations in the world. Bedrock instabilities might emerge from microscale features, such as grain size and mineral orientation, and microfracturing. Any underground storage facility construction has to consider the stored substance and the geological settings. In the Czech Republic, granites and granitoids are the best underground storage sites. Microcrack networks and migration properties are rock specific and vary considerably. Moreover, the matrix porosity also affects the mechanical properties of the rocks. Any underground storage site has to be selected carefully. The authors suggest to study the complex set of parameters from micro to macroscale for a particular place and type of rock to ensure that the storage remains safe and stable during construction, operation, and after closure.
Trvalý link: http://hdl.handle.net/11104/0262460