A.B. Smetanin, E.A. Shchergina, V.G. Shchergin, S.A. Lats
 
Conceptual model of Neocomian series formation in Western Siberia
DOI 10.31087/0016-7894-2019-6-75-90.

Detailed studies within the vast territory of the Latitudinal Ob allowed confirming the phenomenon of full and perfect compensation of sedimentation basin downwarping through sediments accumulation. Paleotectonic studies were conducted to investigate the history of Neocomian clinoforms evolution and conditions of their formation. Based on the results of cyclothems thickness analysis, the following conclusions were made. Deepwater zone having the form of linear trough accompanied by roughly NS trending depression was typical of the Neocomian sedimentation basin in all the stages of its development. This was accompanied by westward migration of the deepwater depression. At each stage of the depression formation, a certain cyclothem was formed, finishing with the sea transgression. Sequential migration of deepwater part of the basin resulted in occurrence of new layers of the Achimov silty-sandy bodies in the west, and progradation of the shelf beds development in the east.

Key words: Neocomian series; clinoforms; formation conditions; epicontinental basin; compensated accumulation; sedimentation; correlation; cyclothem; indexing; modelling.

For citation: Smetanin A.B., Shchergina E.A., Shchergin V.G., Lats S.A. Conceptual formation model of the Neocomian complex in Western Siberia. Geologiya nefti i gaza. 2019;(6):75–90. DOI: 10.31087/0016-7894-2019-6-75-90.

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A.B. Smetanin    Scopus

LUKOIL-Engineering Limited KogalymNIPIneft Branch, Tyumen, Russia;

SmetaninAB@tmn.lukoil.com;

E.A. Shchergina  Scopus

LUKOIL-Engineering Limited KogalymNIPIneft Branch, Tyumen, Russia;

ScherginaEA@tmn.lukoil.com;

 

V.G. Shchergin    Scopus

LUKOIL-Engineering Limited KogalymNIPIneft Branch, Tyumen, Russia;

ShcherginVG@tmn.lukoil.com;

 

S.A. Lats    Scopus

LUKOIL-Engineering Limited KogalymNIPIneft Branch, Tyumen, Russia;

LatsSA@tmn.lukoil.com;