--> Abstract: Forecast And Mapping Of Stratigraphically Trapped Reservoirs On The Basis Of Primary And Secondary Porosity Formation And Preservation Models (Western Siberia And Timan-Pechora Basins), by Michael D. Belonin, V. V. Shimansky, and V. K. Shimansky; #90928 (1999).

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BELONIN, MICHAEL D., VLADIMIR V. SHIMANSKY, and VALENTIN K. SHIMANSKY, VNIGRI
St. Petersburg, Russia

Abstract: Forecast and Mapping of Stratigraphically Trapped Reservoirs on the Basis of Primary and Secondary Porosity Formation and Preservation Models (Western Siberia and Timan-Pechora Basins)

Two models of reservoir formation in terrigenous Western Siberia Neocomian and carbonate Timan-Pechora Upper Silurian sections are considered.

The first model simulates reservoir formation in deep-sea turbidite fans of the Achimovsk series (Western Siberia). Sandstone bodies, formed by grain flows during a regressive stage of sedimentation, are most promising. Intensive biotite sideritization is characteristic of these bodies. Joint study of seismic, log, sedimentological and geochemical data is the basis for mapping the most promising zones of isolated sand bodies with stratigraphic oil and gas traps and good reservoir quality for Neocomian Western Siberian terrigenous deposits. Most of these traps were discovered in Shirotnoe Priobye and the northern area of Western Siberia Basin.

The second model simulates reservoir formation by the mechanism of secondary carbonate dissolution by the action of acid products of syngenetic organic matter decomposition (mainly CO2). Examination of the source rock content, quality and maturity data, and carbonate content made it possible to construct a set of quantitative forecast maps of the best secondary porosity distribution zones for Lower Paleozoic deposits of the Timan-Pechora basin.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas