Evaluation of the stress-strain state of the lithosphere sections and upper layers of Earth's crust in the Bazhenov Suite based on multi-scale numerical modeling
Abstract:
This paper presents the results of multiscale numerical modeling of the stress-strain state of the lithosphere sections and upper crustal layers in one of the West Siberian Plate regions containing oil and gas deposits. Two-dimensional computer models of the structure of lithosphere sections and upper crustal layers of the Bazhenov Suite's oil and gas areas based on the Rubin-2-1990 geologic profile were selected as the objects of research. To calculate the inelastic deformation and stress fields in the lithosphere and crust, the model of elastic-plastic medium with Drucker-Prager-Nikolaevsky yield criterion and plastic potential was used. Constitutive equation parameters for the structurally inhomogeneous lithosphere were determined from the geologic profile data and the cratonic jelly sandwich strength model applicable to the continental lithosphere. Calculations at different scales show that zones of inelastic deformation localization and positive horizontal stresses are concentrated in the upper layers of Earth's crust, where faults and damages are located according to geophysical data. These areas correspond to the locations of hydrocarbon traps and oil and gas deposits in the Bazhenov Suite. The results of this study may be useful for geologists and geophysicists who study the processes of mineral formation in Earth's crust.
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