Sedimentation characteristics and lithological rock types of the Bazhenovskaya Suite on the territoryof Shirotnoye Priobie (Western Siberia)

On the territory of Shirotnoye Priobie (the latitudinal part of the Ob Basin) uniquedeposits of the Bazhenovskaya Suite were formed during the Volgian and Early Berriasian stages. For the purpose of complex studying of the suite depositions, a full complex of geological and geophysical techniques of research were used for interpretation of all the available geological and geophysical data. The high-carbon deposits of the Bazhenovskaya Suite exhibit peculiar palaeontological, abnormal geo-chemical and physical characteristics. Specific palaeo-geographical, hydrological, hydrodynamic conditions, along with the original complex of benthic and nektonic organisms, resulted in the accumulation of sediments differing in their composition and structure. Sediment heterogeneities are connected with changes of content of clay, siliceous, carbonate, organogenic (carbonaceous up to 10-25%) substances in the suite, and also with various palaeontological remains. Five section types confined to definite facial settings of the Bazhenovskiy Palaeobasin are established within the examined area. Positions in section and thickness of different lithologic types of rocks are not identical or constant in different areas of the explored territory, even in all wells within one area. On the territory of Shirotnoye Priobie over 80% of geological resources of oil are genetically connected with carbonate-siliceous-clay deposits of the Bazhenovskaya Suite.

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