GEODYNAMIC FEATURES OF DOBROGEA FORMATION

Abstract

The formation of Dobrogea as a modern geographical unit dates back to the late Neogene. The complex tectonic structure indicates multiphase changes in this key area that are buried under sediment or reflected in outcrops. Separate outcrops to Mesozoic sedimentary rocks and Precambrian-Paleozoic crystalline basement have been identified, while the main part of the region is characterized by Paleogene-Neogene outcrops. According to the peculiarities of the tectonic structure of Dobrogea, it is divided into the Southern, Central and Northern parts, which are separated by faults of the north-western extension and the Pre-Dobrogea depression. The main part of Dobrogea is located in Romania, within Ukraine there is the Prut ledge of the Northern Dobrogea and the Pre-Dobrogea depression, and part of the Southern Dobrogea goes within the borders of Bulgaria - the southern slope of the Dobrogea massif.The geodynamics of the joint zone determined the stages of formation, which were accompanied by platform transformations and tectonic-magmatic processes, as well as the formation of sedimentary complexes with coal, coal seams and oil and gas reservoirs. Based on the factor of destruction of Cretaceous and, possibly, Jurassic and Triassic deposits and their transformation into younger, Paleocene and Maikop deposits, it can be said that large accumulations of gas on structures in Paleogene traps are unlikely.Modern gas migration is characteristic of both the sedimentary strata of the Pre- Dobrogea Depression, ie the northern part of the study region, and the south-eastern part of Southern Dobrogea in carbonate deposits.