Geological Structure, Seismic Stratigraphy and Petroleum Systems of East Siberian Sea Basin

The East Siberian Sea basin (ESSB) is the largest and most unexplored part of the Siberian Arctic shelf.The major problems in geological investigation of East Siberian Sea shelf are absence of deep wells in area and low seismic exploration maturity. In the deepest depocentres sediments thickness exceed 8 km in average. Seismic data was interpreted using methods of seismic stratigraphy. Finally, main seismic horizons were indicated: mBU, BU, LCU, JU, F. In EESB, we can identify Carboniferous-upper Permian, Triassic, Jurassic, Cretaceous, Paleogene and Neogene seismic stratigraphy complexes. We can prove Cenozoic source rocks in Eocene, Mesozoic source rocks in Early Cretaceous, Upper Jurassic, Upper Triassic and older Permian and Carboniferous Paleozoic source rocks. All these source rocks are proved as dominantly oil-prone, except Early Cretaceous and Eocene, which proved as gas-prone. The most perspective prospects in ESSB are probably connected with grabens and depressions and highs. Factors of tectonic history, high thickness of basin sediments, founded possible oil and gas source rocks promise success in future exploration, but in ESSB we also recommend further geophysical investigations and well testing of some most perspective prospects.