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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Regional synthesis of the productive Neocomian complex of West Siberia: Sequence stratigraphic framework
O. V. Pinous,1 M. A. Levchuk,2 D. L. Sahagian3
1Schlumberyer DCS, Reservoir Consulting Services-Russia, Taganskaya Street, 9, 109004, Moscow, Russia; email: [email protected]
2Institute of Oil and Gas Geology, Russian Academy of Sciences, Novosibirsk 630090, Russia; email: [email protected]
3Climate Change Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, New Hampshire, 03824; email: [email protected]
AUTHORS
Oleg Pinous is a research scientist at the Institute of Earth, Oceans and Space. He received his M.S. degree in geology from Novosibirsk State University in 1993 and a Ph.D. in geology from the University of New Hampshire in 1997. For the last five years he has worked in several research projects on stratigraphic analyses of several basins in Russia and Kazakhstan. His research interests include petroleum geology of the CIS basins, basin modeling, sequence stratigraphy, and sea level change.
Mikhail Levchuk is a senior research scientist at the Institute of Oil and Gas Geology (Novosibirsk, Russia). He obtained his M.S. degree in sedimentary geology from Novosibirsk State University in 1971 and Ph.D. in lithology and sedimentology from the Institute of Oil and Gas Geology in 1985. He has more than 25 years of experience in exploration/development and research projects in the West Siberian basin. His interests include petroleum geology, lithology, facies analysis, and basin modeling.
Dork Sahagian is the executive director of the Global Analysis, Integration, and Modeling Task Force of the International Geosphere-Biosphere program. Having received his Ph.D. in epeirogeny and sea level from the University of Chicago in 1987, he has since conducted a many-faceted research program in sea level, basin analysis, tectonics, global change, and volcanology. His stratigraphic research has lately focused on reconstructions of Mesozoic and Cenozoic eustasy.
ACKNOWLEDGMENTS
Thanks go to Victor Zakharov, Boris Shurygin, and Yuri Karogodin for informative discussions that added value to our interpretation. We are grateful to S. M. Kamenetskaya for technical work. The comments of AAPG reviewers R. Mitchum, D. Campion, and A. Donovan led to substantial improvement of the original manuscript. This work was supported by NSF (EAR9618945).
ABSTRACT
We have developed a regional sequence stratigraphic framework for the productive Neocomian complex of central West Siberia. Sixteen depositional sequences have been identified on the basis of analysis of regional seismic lines and well logs. A dip-oriented well-log transect that was constructed across the Nizhnevartovsk and Surgut arches reveals detailed features of the stratigraphic architecture and depositional history of the Neocomian section in two-dimensional view. Integration of ammonite biostratigraphic data led to development of a reliable chronostratigraphic framework for our sequence interpretation.
The Neocomian marine complex ranges in thickness from 350 to 700 m and consists of the clinoform (lower part) and topset packages. Deposition of the clinoform package occurred during a period of at least 9 m.y. when clinoforms prograded more than 550 km from east to west. Progradation occurred through lateral shelf outbuilding mostly during lowstand periods when sandstone units accumulated in shelf-edge deltas, shoreline-shelf systems at the shelf-break zone, and submarine fans in basinal parts (Achimov Formation). Periods of progradation were commonly interrupted by regional transgressions with significant retreat of depocenters landward over the shelf (up to 200 km). The transgressive systems tracts on the shelf are laterally extensive shale horizons that represent useful markers for correlation. The overlying highstand deposits are interpreted as thin but broad sand-prone packages with generally progradational appearance. The lowstand systems tracts on the shelf are locally present as fluvial sandstones that are incised into underlying highstand deposits.
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