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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, vol.26 (2), April 2003, pp 225 - 244
Copyright copyrght.jpg (4253 bytes) 2003 by Scientific Press Ltd. All rights reserved.

UNCONVENTIONAL Previous HitOILNext Hit ACCUMULATIONS IN THE UPPER JURASSIC BAZHENOV Previous HitBLACKNext Hit SHALE FORMATION, WEST SIBERIAN BASIN: A SELF-SOURCED RESERVOIR SYSTEM

N. V. Lopatin+*, S. L. Zubairaev*, I. M. Kos**, T. P. Emets*, E. A. Romanov*** and O. V. Malchikhina***

The Upper Jurassic Bazhenov Formation in the central West Siberian Basin is a classic marine Previous HitblackNext Hit shale unit containing abundant Type II kerogen with high Previous HitoilNext Hit-generation potential. These shales source around 90% of the Previous HitoilNext Hit in the West Siberian Basin. They also contain Previous HitoilNext Hit accumulations in unconventional self-sourced reservoirs. Reservoir zones are generally small and are located along fault planes. Primary Previous HitoilNext Hit migration was focused along fracture networks adjacent to the fault zones. Previous HitOilNext Hit charging took place in the Tertiary and Previous HitoilTop generation and expulsion in the Bazhenov Formation led to overpressuring. In the study area between the Surgut and Nyalinsk arches in the centre of the basin, faulting and fracturing took place in Eocene to Quaternary time. The faulting led to local increases in the thermal maturity of the Bazhenov Formation. Exploration risk in the self-sourced Bazhenov Formation reservoirs mainly relates to seismically-defined regional faults or to transverse faults.

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