The regional prospectivity of the South Mangyshlak, North Caspian and North Ustyurt basins is hereby presented based on seismic stratigraphic interpretation of 2D seismic lines acquired by CGGVeritas between 2006-2009 in both the central and northern Caspian Sea. The seismic dataset covers part of the offshore extension of each basin. We have identified four mega-sequences within the North Caspian Basin, two mega-sequences within the North Ustyurt basin and three mega-sequences within the South Mangyshlak Basin. The mega-sequences represent discrete phases of basin-fill mainly caused by a combination of tectonic subsidence, sedimentation rate and relative sea level change. These mega-sequences were identified based on seismic reflection terminations on bounding regional unconformities and their correlative conformities. These represent key plate re-organisation episodes and relative sea level change. In the North Caspian Basin, we have identified Devonian-Carboniferous, Permian-Triassic, Jurassic-Cretaceous and Tertiary mega-sequences. The Jurassic-Cretaceous and Tertiary mega-sequences occur in all three basins with similar depositional facies. The Permian-Triassic sequence is different in both depositional history and petroleum play elements in all three basins whilst the Devonian-Carboniferous sequence has been drilled only in the North Caspian basin.


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