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Open Geosciences

formerly Central European Journal of Geosciences

Editor-in-Chief: Jankowski, Piotr

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Integrated petrographic – rock mechanic borecore study from the metamorphic basement of the Pannonian Basin, Hungary

László Molnár
  • Corresponding author
  • Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Hungary
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/ Balázs Vásárhelyi
  • Corresponding author
  • Deptartment of Geotechnics and Engineering Geology, Budapest University of Technology and Economics, Budapest, Hungary
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/ Tivadar M. Tóth
  • Corresponding author
  • Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Hungary
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/ Félix Schubert
  • Corresponding author
  • Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Hungary
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Published Online: 2015-01-16 | DOI: https://doi.org/10.1515/geo-2015-0004

Abstract

The integrated evaluation of borecores from the Mezősas-Furta fractured metamorphic hydrocarbon reservoir suggests significantly distinct microstructural and rock mechanical features within the analysed fault rock samples. The statistical evaluation of the clast geometries revealed the dominantly cataclastic nature of the samples. Damage zone of the fault can be characterised by an extremely brittle nature and low uniaxial compressive strength, coupled with a predominately coarse fault breccia composition. In contrast, the microstructural manner of the increasing deformation coupled with higher uniaxial compressive strength, strain-hardening nature and low brittleness indicate a transitional interval between the weakly fragmented damage zone and strongly grinded fault core. Moreover, these attributes suggest this unit is mechanically the strongest part of the fault zone. Gougerich cataclasites mark the core zone of the fault, with their widespread plastic nature and locally pseudo-ductile microstructure. Strain localization tends to be strongly linked with the existence of fault gouge ribbons. The fault zone with ∼15 m total thickness can be defined as a significant migration pathway inside the fractured crystalline reservoir. Moreover, as a consequence of the distributed nature of the fault core, it may possibly have a key role in compartmentalisation of the local hydraulic system.

Keywords : fractured metamorphic reservoir; rock mechanical parameters; fault rocks; brittle deformation

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About the article

Received: 2014-03-25

Accepted: 2014-10-13

Published Online: 2015-01-16


Citation Information: Open Geosciences, ISSN (Online) 2391-5447, DOI: https://doi.org/10.1515/geo-2015-0004.

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© 2015 L. Molnár et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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