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Anisotropy of Strength and Elastic Properties of Lower Paleozoic Shales from the Baltic Basin, Poland

Author

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  • Przemyslaw Michal Wilczynski

    (Faculty of Geology, University of Warsaw, Zwirki i Wigury 93 Str., 02-089 Warszawa, Poland)

  • Andrzej Domonik

    (Faculty of Geology, University of Warsaw, Zwirki i Wigury 93 Str., 02-089 Warszawa, Poland)

  • Pawel Lukaszewski

    (Faculty of Geology, University of Warsaw, Zwirki i Wigury 93 Str., 02-089 Warszawa, Poland)

Abstract

The paper presents the results of laboratory studies on the strength–strain properties of shales representing four siltstone-claystone lithostratigraphic units occurring in the Baltic Basin. Laboratory studies in a triaxial stress state were conducted as single failure tests on cylindrical samples oriented parallel and perpendicular to lamination within the rocks. Mutually perpendicular samples were cut out from the same drill core sections in order to determine mechanical anisotropy. Samples oriented parallel to lamination were characterised by values of the static Young’s modulus twice as high as from samples oriented perpendicular to lamination. Similar variability was observed in the case of maximum differential stress values and Poisson’s ratio. Samples parallel to lamination registered notably lower axial strains, which influenced increased values of Young’s modulus and Poisson’s ratio. The rocks studied are characterised by VTI type (vertical transverse isotropy) internal anisotropy of the rock matrix, which significantly influences the anisotropy of their geomechanical properties.

Suggested Citation

  • Przemyslaw Michal Wilczynski & Andrzej Domonik & Pawel Lukaszewski, 2021. "Anisotropy of Strength and Elastic Properties of Lower Paleozoic Shales from the Baltic Basin, Poland," Energies, MDPI, vol. 14(11), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:2995-:d:559820
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    References listed on IDEAS

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    1. Hadi Parvizi & Sina Rezaei Gomari & Farhad Nabhani & Abolfazl Dehghan Monfared, 2018. "Modeling the Risk of Commercial Failure for Hydraulic Fracturing Projects Due to Reservoir Heterogeneity," Energies, MDPI, vol. 11(1), pages 1-14, January.
    2. Hong Xue Han & Shunde Yin, 2018. "Determination of In-Situ Stress and Geomechanical Properties from Borehole Deformation," Energies, MDPI, vol. 11(1), pages 1-13, January.
    3. Klaudia Wilk, 2019. "Experimental and Simulation Studies of Energized Fracturing Fluid Efficiency in Tight Gas Formations," Energies, MDPI, vol. 12(23), pages 1-17, November.
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    Cited by:

    1. Małgorzata Słota-Valim & Anita Lis-Śledziona, 2021. "The Use of Well-Log Data in the Geomechanical Characterization of Middle Cambrian Tight Sandstone Formation: A Case Study from Eastern Pomerania, Poland," Energies, MDPI, vol. 14(19), pages 1-25, September.
    2. Przemyslaw Michal Wilczynski & Andrzej Domonik & Pawel Lukaszewski, 2021. "Brittle Creep and Viscoelastic Creep in Lower Palaeozoic Shales from the Baltic Basin, Poland," Energies, MDPI, vol. 14(15), pages 1-22, July.

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