MORPHOLOGY AND DISTRIBUTION OF THE RIPHEAN DEPOSITS IN THE NORTHEAST OF THE ANABAR ANTECLISE

V. S. Staroseltsev, B. B. Shishkin, G. A. Berilko.

The authors have analysed the structure of the Riphean, Lower Paleozoic, and Vendian-Cambrian successions in the northeast of the Anabar anteclise as interpreted by SNIIGGiMS and IPGG SB RAS. Taking into account the results of deep drilling and 2D CDP seismic survey, the depths of occurrence and extension areas of the Riphean deposits were substantiated, which are markedly different from ones taken in IPGG SB RAS by isolation of two sections of the Riphan basins different in structure. The paper discusses distribution of the flat-lying and poorly dislocated Lower Proterozoic deposits within a vast territory. The authors consistently justify isolation of heterochronous Riphean, Vendian, and Cambrian formation in the deep-well logs, which in many cases differ from ones suggested by IPGG SB RAS. A conclusion was made about the importance of the suggested adjustments for interpretation of the profiles currently surveyed by 2D seismic survey within the territory with the aim of further use of the derived results in appraising the petroleum potential of the northeastern Anabar syneclise.

Key words: Riphean basins, the Riphean base, stratigraphic breakdown of cross-sections.

DOI 10.20403/2078-0575-2016-1-44-56

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