EARLY PROTEROZOIC COMPLEX OF THE NORTERN ANGARA-KOTUI RIFT RIPHEAN TROUGH AND ITS POSSIBLE INFLUENCE ON PETROLEUM POTENTIAL

V. S. Staroseltsev, L. A. Krol

The complex of geological and seismic data obtained at the conjunction zone of the Tunguska syneclise and Anabara anteclise was analyzed by the SNIIGGiMS researchers mainly after publishing a tectonic map of the basement in 1970s. The map is based on the interpretation of potential fields. As a result following conclusion was substantiated: the Lower Proterozoic formations in the north-eastern Tunguska (Kureika) syneclise are possibly included not in the Siberian Platform basement but in its protoplatform mantle in the zone of northern end of the Angara-Kotui Riphean rift trough. The approximate maximum thickness of Lower Proterozoic deposits reaches 2.1–2.3 km. Judging by the reflected energy values estimates on the ReapackPK+ system processed data, these deposits include horizons enriched with organic matter. In the Riphean during the subsidence of the horizons hydrocarbon streams could be generated and could forme bituminous fields of the Mukunian series red horizons in Lower Riphean. Up to now, the explanation of such fields has caused severe difficulties, their solution will enable researchers to predict industrial significance of the fields for their further exploitations in more grounded way.

Key words: Karelides block, Lower Proterozoic deposits, basal complex, platform mantle.