--> Abstract: 3D Basin Simulation and Hydrocarbon Systems Analysis of the West Siberia Basin, by Scott A. Barboza, L. Burshtein, Erik Fjellanger, A. E. Kontorovich, and V. R. Livshits; #90072 (2007)

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3D Basin Simulation and Hydrocarbon Systems Analysis of the West Siberia Basin

Scott A. Barboza1, L. Burshtein2, Erik Fjellanger3, A. E. Kontorovich2, and V. R. Livshits2
1ExxonMobil Upstream Research Company, Houston, TX
2Russian Academy of Sciences Siberian Branch, Novosibirsk, Russia
3ExxonMobil Exploration Company, London, United Kingdom

West Siberia Basin is a broad, gentle structural downwarp filled with up to 10 km of Mesozoic and Cenozoic clastic sedimentary rocks. Basement is composed of Paleozoic accretionary crust. Permian-Triassic rifting is accommodated along northward striking extensional grabens. The rifted basin was filled by fluvio-deltaic sediments prograding from the south and east, punctuated by periods of marine transgression from the north. Cenozoic basin inversion formed traps for petroleum. The combination of continental sedimentation, post-rift thermal sag, abundant source rocks and recent glaciation provide for a natural laboratory to study how these factors may combine to control the thermal evolution of the basin and the timing of hydrocarbon generation. A regional 3D basin simulation using structural grids from 2D seismic and well data were used to model the basin thermal evolution. Tertiary erosion was also mapped and incorporated in the modelling. Basal heat flow was inferred by numerical iteration to reproduce interpreted present-day maturity maps based upon vitrinite reflectance measurements. Three key stratigraphic intervals containing the primary source rocks were considered: 1) Early-Middle Jurassic lacustrine coals and shales; 2) Late Jurassic to Lower Cretaceous marine bituminous shales; 3) Upper Cretaceous delta plain humic and coaly shales. Geostatistical modeling suggest that Middle Jurassic – Lower Cretaceous source quality increases basinward but decreases to the north, an inference that has consequences for both the timing of generation and hydrocarbon type, as revealed by the basin simulations. The Aptian Tanopchin Formation dominates in thermal gas generation from Upper Cretaceous humic sources within the Yamal Penninsula. Considerable volumes of gas might have migrated to Upper Cretaceous formations from the Lower and Middle Jurassic deposits.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece