Role of the Tectonomagmatic Factor in Formation of Giant Hydrocarbon Accumulations in the East Barents Basin

摘要

In terms of tectonics, the East Barents basin (megabasin) represents an extended (～1400 km) wedge-shaped ～500- to 300-km-wide structure that crosses the West Arctic continental-marginal platform in the meridional direction and is truncated by a system of pericratonic depressions of the East European Platform on the beam of the Kola Peninsula. According to geological-geophysical data, the Paleozoic-Mesozoic sedimentary cover of the basin is presumably >20 km thick [11, 13], although its exact thickness is unknown so far. Approximately 14 km of the sedimentary section are represented by Upper Permian-Mesozoic terrigenous sediments, 11 km of which correspond to the Upper Permian-Triassic sequence. The underlying Paleozoic complex is composed of terrigenous-carbonate and carbonate facies.