Early Permian facies and paleogeography of the Southeastern Russian craton |
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Authors: | Prof Dr Vitaly G Kuznetsov |
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Institution: | (1) State Academy of Oil and Gas, 65 Leninsky prospekt, 117917 GSP Moskva |
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Abstract: | Summary During the Early Permian deep-water basins existed in the southeastern part of the Russian craton. North and west of the Cis-Ural
foredeep and the Precaspian depression (micro-ocean) carbonate platforms were formed on a shallow-marine shelf during the
Asselian, Sakmarian and Early Artinskian. Reefs developed on the margin of these platforms along the slopes of the Cis-Ural
foredeep and the Precaspian depression. The reefs shifted platform ward in the eastern areas, due to the tectonic subsidence
of the platform margin and at the same time, prograded basinward in the south. Movements of continental blocks from the south
during the Late Artinskian and Kungurian caused the separation of the Early Permian basin of the Russian craton from the Palaeo-Tethys,
followed by evaporite sedimentation in the restricted basins.
The existence of source rocks (bituminous deep-water sediments), thick reservoir rocks (limestones and dolostones), evaporitic
seals and structural as well as stratigraphic traps are responsible for large productive gas and oil fields (e.g., Orenburg
field), some of which are distinctly associated with reef carbonates. |
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Keywords: | Paleogeography Carbonate Rocks Reefs Reservoir Rocks Russian Craton Subsurface Early Permian |
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