The stress-strain state modelling of the autochthonous sedimentary complex in the dynamic influence zone of the thrust wedge

Journal Title: Геодинаміка - Year 2014, Vol 16, Issue 1

Abstract

Purpose. Computer modelling in the framework of continuum mechanics is a powerful tool to obtain qualitative and quantitative deformation parameters in the geological media. The purpose of this work was to study stress and strain fields of the sedimentary autochthonous complex owing to moving a thrust wedge. Subject of inquiry is layered rocks with different geometrical and mechanical properties bounded by the basement of the peleobasin and compressive thrust wedge taking into account the gravitational forces and contact frictions. Methodology. Series of the finite-element 2D-models of dynamic influence of thrust wedge on the sedimentary autochthonous complex are constructed. We consider layered structures with different mechanical properties, transferring of tectonic compression through mechanical frictional contact, morphology of a fault surface and dependence on deformation ratio. The stress-strain state of rocks in front of the thrust wedge are calculated. The developed technique of the complex analysis of stress and strain invariants for visualization was used. Distributions of the equivalent strains and stresses, pressures, maximal tangential stresses, stress trajectories and slide lines traced under angle of the internal friction to them, as well the probable fracturing zones that defined by Byerlee's criterion are mapped. All together they are most important for geological interpretation. Results. The analyzed stress and strain fields of the models found that successive thrust fault in the autochthonous occurred in front of the allochthonous structure and had primarily an arc-like surface. The sizes of thrust structures depend on sedimentary rocks thickness, order of competent and incompetent layers, less – on velocity of sliding. Originality. The explanation of morphology, the thrusts proportion and pattern of the stress and strain distribution inside these structures are resulted. Practical significance. The revealed regular dependences of the thrust formation mechanism are important to consider controversial questions of tectonic zoning and structural evolution of the Ukrainian Carpathians, interpretation of geophysical data about deep parts of the thrust nappes and its para-autochthon, in particular, related to exploration of the oil-and-gas bearing structures.

Authors and Affiliations

L. N. Khomyak, M. M. Khomiak

Keywords

Related Articles

The Earth: virtuality of plate tectonics, conformality of fixism and mobilism

Aim. The need to revise the views on the tectonic evolution of the Earth is caused by dissatisfaction with its modern paradigm - the tectonics of lithospheric plates. The purpose of this article is a healthy critical ana...

Prospects of nuclear-physical methods for the distinction of gas-saturated reservoir rocks in complicated neogene sediments

Purpose. The purpose of this work is to establish features of geological structure of complicated reservoir rocks, creation the petrophysics interpretation basics of integrated geophysical research for the results of the...

The link of radon and magnetic anomalies on the territory of Ukrainian shield and Kyiv

The aim of this research is to detect the connection between geomagnetic and radon anomalies in the area of Kyiv Ukraine, studying the geoecological situation of the territory, and assessing its ecological safety. Geom...

Gas-generation potential estimation of silurian shale deposits of Volhyno-Podillya margin of East European platform

Purpose. Estimation of gas-shale potential of rocks on the base of experimental researches of core-samples and thermobaric terms determination, that are most favorable for the emission of gaseous hydrocarbons from rocks....

Thermodynamic and hydrogeological conditions of forming the hydrocarbon deposits of the Pre-Black Sea aquiferous basin

Purpose. Finding the connection between the thermodynamic conditions of hydrocarbon mixtures synthesis and zones of oil and gas accumulation. Methodology. The thermodynamic eguilibrium depths of gas and gas-condensate de...

Download PDF file
  • EP ID EP459261
  • DOI -
  • Views 91
  • Downloads 0

How To Cite

L. N. Khomyak, M. M. Khomiak (2014). The stress-strain state modelling of the autochthonous sedimentary complex in the dynamic influence zone of the thrust wedge. Геодинаміка, 16(1), 58-71. https://europub.co.uk/articles/-A-459261