--> Abstract: High Resolution Foraminiferal Biostratigraphy of the Upper Jurassic Petroleum Regions of the Arctic Basin, by Boris Nikitenko and Michael Mickey; #90039 (2005)

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High Resolution Foraminiferal Biostratigraphy of the Upper Jurassic Petroleum Regions of the Arctic Basin

Boris Nikitenko1 and Michael Mickey2
1 Institute of Petroleum Geology, Siberian Brach of RAS, Novosibirsk, Russia
2 Micropaleo Consultants, Encinitas, CA

The Upper Jurassic is one of the main targets for oil and gas production in Siberia, Alaska and Canada. Study of the Upper Jurassic from outcrops and wells in northern Siberia characterized by numerous ammonites allows a precise determination of the boundary between foraminiferal assemblages according to the ammonite zonation. During the past several years, the Upper Jurassic zonation of Siberia based on foraminifers has been improved, detailed and correlated with the Boreal ammonite standard. Micropalaeontological study of numerous Upper Jurassic sections from Northern Alaska, allows us to establish a succession of foraminiferal zones similar to the Siberian one. Study of the microfossils reported by Canadian micropaleontologists reveals a significant similarity in taxonomic composition of Upper Jurassic foraminifers from the Canadian Arctic and Siberia. Published data on the stratigraphic distribution of Upper Jurassic foraminifers from the Barents Sea region allow us to recognize some of the Siberian foraminiferal zones. The foraminiferal assemblages of the northwestern Pechora Basin are rather distinctive. They comprise both Siberian and southern elements that result in an alternation of local and Siberian assemblages in the foraminiferal succession of this region. Thus, Upper Jurassic foraminiferal zonations developed in sections from Siberia can be traced over the whole Arctic basin. Therefore, Upper Jurassic zonations based on foraminifers established for northern Siberia can be considered as an Arctic zonal standard. Moreover, a number of marker-levels, based on microfossils have been traced which allow us to correlate Arctic and European microfossil zonations of Upper Jurassic age.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005