ГЕОЛОГИЧЕСКОЕ СТРОЕНИЕ ЗЕЯ-БУРЕИНСКОГО ОСАДОЧНОГО БАССЕЙНА ПО РЕЗУЛЬТАТАМ КОМПЛЕКСНОЙ ИНТЕРПРЕТАЦИИ МАТЕРИАЛОВ БУРЕНИЯ И СЕЙСМОСТРАТИГРАФИИ

Abstract

This study summarizes the most recent geological and geophysical data on the Zeya-Bureya sedimentary basin (Russian Far East). The stratigraphy of the sedimentary cover is described. A comparative analysis of the Zeya-Bureya sedimentary basin and the Songliao basin (China) to the south of it, which is similar in its tectonic nature, structure and geological history, indicates that the Ekaterinoslavka Formation, occurring at the base of the sedimentary cover and formerly assigned to the Jurassic, is Lower Cretaceous in age. Results of the reinterpretation of the old CDP data (2014–2018) were used to infer the seismostratigraphic characteristics of the section and to identify six geoseismic sequences. The wave pattern of the constructed sections confirms the synrift nature of the grabens at the base of the sedimentary cover of the Zeya-Bureya sedimentary basin. Thickness maps of Cretaceous formations and a tectonic map of the sedimentary cover were compiled from the core and deep drilling data as well as 2D and 3D CDP seismic survey data taking into account the integrated interpretation of gravity, magnetic, and geological survey data. The evolution of the study area is divided into four stages: synrift, early syneclise, late syneclise, and neotectonic.