Abstract
During the Paleozoic period from the beginning of the Cambrian to the end of the Carboniferous in the boundaries of the West Siberia tectonic depression there occurred the sea, where the carbonate platforms were formed by the limestones accumulation. All the area at the end of the Carboniferous period was turned to land. Resulting from Gertsynskaya folding in the times of Permian - Triassic the formed deposits were folded and denudated to a considerable extent. Besides, the reservoir rocks of the crust of weathering including redeposited one, were formed as a result of hypergenesis, during the continental stand of the area in the near-surface zone. A new geological prospecting unit has been suggested which underlies these crusts of weathering and formed during fracture tectonic processes with hydrothermal-metasomatic limestones reworking and the processes of hydrothermal leaching and dolomitization. So, in the carbonate platforms the system of fissure zones related to tectonic disturbance was formed. This has a dendrite profile where the series of tangential, more thinned fractures deviate from the stem and finish in pores and caverns. The carbonate platforms formation in the West Siberia tectonic depression has been analyzed, their dynamics and gradual increasing from the minimal in Ordovician and Silurian to maximal at the end of the Late Devonian has been shown.
Highlights
West Siberia tectonic depression is one of the most promising sources of oil and gas stock addition for the whole territory of Russia
In this area during the Permian – Triassic period or the continental stand time in the near-surface zone which is called the oil-bearing horizon of the contact zone for the Paleozoic and overlapping Mesozoic deposits [9] there formed the crusts of weathering including redeposited ones
We show the areas, where the Paleozoic profile is mostly preserved in the West Siberia boundaries
Summary
The concept of Paleozoic reservoir rock formation in the near-surface zone, where the Paleozoic deposits occurred on land is a generally accepted point of view. In this area during the Permian – Triassic period or the continental stand time in the near-surface zone which is called the oil-bearing horizon of the contact zone for the Paleozoic and overlapping Mesozoic deposits [9] there formed the crusts of weathering including redeposited ones.
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