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Comparison of Meso-Cenozoic Tectonic Subsidence of Odessa Shelf and Azov Sea, Ukrainian Offshore


Khriachtchevskaia, Oxana I.1, Sergiy M. Stovba1, Randell A. Stephenson2 (1) Scientific Research Institute of Oil and Gas Industry of National Joint-Stock Company “Naftogaz of Ukraine” (“Naukanaftogaz”), Kyiv, Ukraine (2) Vrije Universiteit, Amsterdam, Netherlands


The evolution of the Ukrainian offshore - Odessa Shelf (NW Black Sea) and Azov sea was studied using seismic/well data. Three stages of the Meso-Cenozoic tectonic history of Odessa shelf were revealed from seismic data: rifting due to extension (Early Cretaceous – earliest Late Cretaceous); post-rift thermal subsidence (middle Late Cretaceous - Middle Eocene); inversion (Late Eocene – Middle Miocene). 1D backstripping and forward model­ling was applied to confirm these stages. The modelling results clearly demonstrate the stages of tectonic evolution of the Odessa shelf and specify their age: rifting (middle Early Cretaceous – Santonian) with delta factor of 1.13; the post-rift thermal subsidence (Campanian – Middle Eocene) with delta factor of 1.0; the compression with delta factor of

0.9 (Late Eocene – Middle Miocene).

The modelling results demonstrate only two stages of tectonic evolution of the Azov sea: rifting (Albian) with delta factor of 1.05; post-rift thermal subsidence (Late Cretaceous – Eocene) with delta factor of 1.0. Tectonic events during Oligocene-Early Miocene within the Azov sea very likely connected with the formation of the Indolo-Kuban Foreland of the Great Caucasus. The normal post-rift subsidence that existed during Late Cretaceous – Eocene, was reestablished after Early Miocene. Thus, the tectonic evolution of the Odessa shelf had only some resemblance to the one of the Azov sea in the Cretaceous – Eocene time as we can recognise the same stages of their tectonic history. The rift stage of the Azov sea com­pleted earlier than it happened within the Odessa shelf.