--> Abstract: Sequence Stratigraphy and Reservoir Potential of the Ordovician - Silurian and Lower Devonian Platform Carbonates, Timan - Pechora province, Russia, by N. V. Taninskaya, V. G. Kots, and K. V. Viskunova; #90942 (1997).

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Abstract: Sequence Stratigraphy and Reservoir Potential of the Ordovician - Silurian and Lower Devonian Platform Carbonates, Timan - Pechora province, Russia

TANINSKAYA, NADEGDA V.*, VLADIMIR G. KOTS, KARINA V VISKUNOVA

Ordovician-Silurian and Lower Devonian platform carbonates were deposited in a shallow marine environment. The facies belts of Early-Middle Paleozoic carbonate platform have been recognized. These facies are as follows: 1) supratidal (platform evaporites); 2) intertidal; 3) upper subtidal; 4) patch-reefs (biostromes and banks); 5)lower subtidal flat; 6) margin reefal complex; 7) foreslope and 8) basin floor.

Tectonic processes of this region and sea-level change influenced the sequence formation within this carbonate complexes. It is possible to identify nine 3-order sequences from well, outcrop and seismic data. Three systems tract of a type-1 were recognized in most of the sequences: lowstand (LST), transgressive and highstand systems tract.

The most thick reefal complexes of barrier type were formed on the margin part of this platform during Middle Ordovician, Late Llandoverian, Late Wenlockian - Lludlovian, Late Pragian - Emsian times.

Carbonate reservoirs formed in the inner part of the platform during rising and highstand sea level. They are often associated with upper subtidal zone. The upper subtidal zone is characterized by the intensive sediment dolomitization in early diagenesis. The best reservoir properties are in coral-stromatoporoid dolomite boundstone and grainstone which formed productive biostromes. Growth of these biostromes often took place in the upper subtidal zone.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria