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Book Chapter

Conclusions

Published:
January 01, 1991

Abstract

Among the world's petroleum provinces, the West Siberian basin is geologically distinctive in several aspects. The factors of basin size, paleostructural history, continental-marine facies interchange and cyclic depositional history, abundant source rock and reservoir facies, and efficient petroleum generation and preservation conditions combine to make it one of the world's foremost petroleum provinces. This enormous basin, the world's largest intracratonic basin, underwent a remarkably stable, but paleostructurally mildly active, Mesozoic depositional history of slow subsidence and basin filling, all of which combined to provide optimum environmental conditions for petroleum accumulation and preservation. Terrigenous sediment influx, mainly from the southeast, was sufficiently great for coarse clastic materials to spread widely across the eastern half of the basin and intertongue with marine sapropelic facies of the open basin to the west.

At the same time, the basin was sufficiently large and subsidence rates were great enough that terrigenous sediment influx did not fill it entirely. This imbalance allowed the development of partially starved-basin conditions in much of the western half of the basin, where as much as 2500-3000 m (8000-10,000 ft) of dark marine shale, much of it rich in organic matter, was deposited between Middle Jurassic and early Tertiary time. During most of Early Cretaceous time, the site of the deltaic-open basin transition was across the central basin area, the Khanty regional high, a regional paleostructural feature of the basin apparently inherited from late Paleozoic Hercynian tectonic activity. Continuous but mild paleostructural growth of the Khanty regional high and associated smaller structural

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Contents

AAPG Studies in Geology

Geology and Hydrocarbon Habitat of the West Siberian Basin

James A. Peterson
James A. Peterson
U.S. Geological Survey Missoula, Montana, U.S.A.
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James W. Clarke
James W. Clarke
U.S. Geological Survey Reston, Virginia, U.S.A.
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American Association of Petroleum Geologists
Volume
32
ISBN electronic:
9781629811178
Publication date:
January 01, 1991

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