--> Abstract: Stratigraphic Sequences and Oil and Gas Complexes of the Pechora Basin, Northeastern Russian Platform, USSR, by E. O. Malysheva, N. V. Belyaeva, T. V. Maldi, R. Ressetar, and J. Smale; #91012 (1992).

Datapages, Inc.Print this page

ABSTRACT: Stratigraphic Sequences and Oil and Gas Complexes of the Pechora Basin, Northeastern Russian Platform, USSR

MALYSHEVA, ELENA O., N. V. BELYAEVA, and T. V. MAIDL, Komi Science Center, Syktyvkar, USSR, and ROBERT RESSETAR and JOHN SMALE, University of South Carolina, Columbia, SC

The sedimentary section of the Pechora basin closely resembles those of other foreland basins (e.g., the Canadian Rockies and the Appalachians) in forming a cratonward tapering wedge. The section can be grossly divided into two megasequences: a lower (Ordovician to Lower Permian) passive margin megasequence consisting of marine clastic and carbonate rocks; and an upper (Lower Permian to Cretaceous) syn- to postorogenic megasequence composed of polymict terrigenous clastic rocks shed from the Ural fold and thrust belt.

Borehole and outcrop data show that both megasequences consist of smaller scale transgressive/regressive sequences that can generally be correlated with published coastal onlap curves. The transgressive/regressive sequences basically define the oil and gas complexes: parts of the sedimentary section sharing characteristics such as common seals and genetically related reservoir rocks. The pre-Kungurian sequences were controlled by the interactions of eustasy, aulacogen formation, and thermal subsidence during the miogeosynclinal stage of basin evolution. In contrast, the lower part of the upper megasequence (Kungurian to Lower Triassic) resulted from tectonically driven transport of clastic debris, and marine deposition did not resume until transgressions from the area of the present B rents Sea flooded the basin in the Jurassic.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)