--> Paleozoic Reservoirs West Siberian Basin, by N. D. Zapivaloy; #90986 (1994).

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Abstract: Paleozoic Reservoirs West Siberian Basin

Nicolay D. Zapivaloy

Recent studies and deep drilling have shown that Paleozoic deposits in Western Siberia are producing. The first oil flow from Devonian carbonate rocks was obtained in the Maloicha area in May, 1974. Up to the present a number of oil and gas pools has been discovered in the Devonian formations of West Siberia. A reef-containing lithofacies complex with facies of the front slope and organic reef is clearly distinguished within the Malocha bank. A major oil pools at Melocha field is confined to metasomatic dolomites of the front slope facies. Oil flows up to 900-1200 bbl per day have been obtained from the dolomites. Reservoir characteristics of carbonate rocks of the front slope are considerably better than those of massive limestones. The open porosity of organic reef facies is 6-12%, ermeability 0.088 square micrometer; the type of reservoir is pore-cavernous and pore-fissured. The reservoir properties of carbonate rocks have been improved due to the leaching effect of CO2 that migrated along faults together with gas-hydrothermal solutions. Organic build-ups in Devonian carbonate were proved to be most promising targets for the search of oil accumulations.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994