--> Abstract: Occurrence of Oil and Gas Fields and Source Rock Transformation in the West Siberian Basin and Barents Sea Platform, by N. Lopatin; #90990 (1993).
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LOPATIN, NIKOLAI, Institute of Geochemistry, Moscow, Russia

ABSTRACT: Occurrence of Previous HitOilNext Hit and Gas Fields and Source Rock Transformation in the Previous HitWestNext Hit Previous HitSiberianNext Hit Previous HitBasinNext Hit and Barents Sea Platform

The Previous HitWestNext Hit Previous HitSiberianNext Hit and Barents Sea basins contain the largest demonstrated reserves of gas in the world (more than 55 trillion cu m) and very large recoverable reserves of Previous HitoilNext Hit (about 19 billion tons). The main productive reservoirs are of the Jurassic and Cretaceous and are composed of marine and alluvial sandstones. Major gas fields of the Previous HitWestNext Hit Previous HitSiberianNext Hit Previous HitbasinNext Hit are located north of the Arctic Circle, from which they extend into the Yamal Peninsula and offshore into the Kara Sea. Previous HitOilNext Hit fields of the Previous HitbasinNext Hit are found mainly in the middle Ob region. Only one giant gas-condensate field has been found in the Barents Sea; however, this area has excellent potential for gas-condensate discoveries in the future. Both basins contain Kimmeridgian-Tithonian black-shale formations, which are prolific o l source rocks.

In the Barents Sea Previous HitbasinNext Hit, Kimmeridgian black shales contain 7 to 9% of organic carbon; total pyrolysis yield ranges from 5.3 to 84.2 mg HC/g rock, and hydrogen index ranges from 270 to 630 mg HC/g TOC. Our pyrolysis data and Previous HitbasinNext Hit modeling (GALO version) indicate that the realization of the initial petroleum potential in the Shtokmanov field area has not begun because the volume of generated Previous HitoilNext Hit (about 8 mg HC/g TOC) is insufficient to start expulsion (threshold of expulsion is equal to 96 mg HC/g TOC).

The Bazhenov Formation shales in the central part of the Previous HitWestNext Hit Previous HitSiberianNext Hit Previous HitbasinNext Hit are characterized by extremely high values of pyrolysis measurements. The organic carbon content ranges from 10 to 25%; the residual petroleum potential varies from 50 to 190 mg HC/g rock; the maturity typically corresponds to the Previous HitoilNext Hit window zone; and the amount of expelled hydrocarbons ranges from 40 to 60 mg HC/g rock. The expulsion of Previous HitoilNext Hit commenced 90 to 35 m.y. In the northern part of the Previous HitWestNext Hit Previous HitSiberianNext Hit Previous HitbasinNext Hit, the Bazhenov shales are lean source rocks.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.