A new concept for the Paleogene lithostratigraphy in the onshore part of the Dolna Kamchiya Basin (eastern Bulgaria) on the basis of 3D modeling

Abstract

This study is based on primary lithological data from 96 boreholes and lithostratigraphic interpretation of 17 seismic profiles from the onshore part of the Dolna Kamchiya Basin, which belongs to the onshore sector of the Moesian Platform and comprises the south-easternmost part of the Southern platform zone. Nine formal Paleogene lithostratigraphic units were recognized (the Byala, Komarevo, Dvoynitsa, Beloslav, Dikilitash, Aladan, Avren formations, the Dolni Chiflik Member of the Avren Formation, and the Ruslar Formation). For visualization of their spatial relationships and revealing the deep structure of the basin, a 3D lithological model was created. In addition, new data on the lithology, thicknesses and ages of the units were provided.

3D chronostratigraphic model of the Paleogene in the onshore part of the Dolna Kamchia Basin (Eastern Bulgaria)

“…More than 100 onshore boreholes have been drilled on a small area of about 300 km 2 since the beginning of the 1950s (the geological reports are kept in the National Geological Fund, Ministry of Energy). Recently, the Paleogene succession in the onshore part of the basin (a brief review on the geological setting was published by Dimitrov and Georgiev, 2005;Stefanov, 2018) has been studied by seismic profile's interpretation and applying of a 3D modeling approach in lithological and lithostratigraphic aspects (Valchev et al, 2020). The last article provided data about the exact chronostratigraphic range of the recorded lithostratigraphic units.…”