Experimental study of relationship between deformations of a sedimentary cover in the Siberian platform in the area of the Kovykta gas condensate field and tectonic processes on its southeastern edge

Abstract

Dynamic settings of the formation of discontinuous systems in a sedimentary cover of the Siberian platform in the area of the Kovykta gas condensate deposit that existed in the Paleozoic and Cenozoic are consistent with those for its southern edge, which allows us to talk about their possible relationship with the determining role of the latter in relation to the former. The Kovykta area is more than 100 km away from the southern edge of the Siberian platform. In this regard, the presence of the discussed relationship requires additional argumentation in the form of substantiation of the physical possibility of transmitting deformations along the sedimentary cover at such a distance from the edge of the platform. The authors, in compliance with the conditions of similarity, performed physical modeling of the geodynamic conditions of N-W compression, left-sided shear and S-E tension, which operated on the southern edge of the Siberian platform in the Paleozoic, early Cenozoic and middle-late Cenozoic, respectively. The results of the simulation showed that under certain boundary conditions of the experiments, deformations can propagate from the edge of the model to its inner parts over long distances only ubder compression and extention. Under conditions of shearing, the lateral dimensions of the area of spatial propagation of deformations in the model are always smaller than those observed in its natural counterpart. This indicates that the Early Cenozoic dynamic environment of the left sheare in the sedimentary cover of the Kovykta gas condensate deposit owes its origin to a complex of geodynamic processes on all active margins of the Siberian platform.