Detailed correlation and improved facies zoning of Callovian-Upper Jurassic oil and gas bearing formations (the Siberian sector of the Arctic)

Complicated structure and low drilling maturity are typical of the Callovian-Upper Jurassic deposits in the Siberian Sector of the Arctic, which are promising for oil and gas exploration. Correlation of the deposits remains largely a matter of debate. The authors present the results of detailed correlation carried out using biostratigraphic, lithostratigraphic, and cyclostratigraphic methods at the level of horizons, formations, and members having cyclic structure. The results of the studies were 29 correlation charts, and 10 of them are shown in the paper. They cover all the structural and facies zones of the region. The recent facies zoning (B.N. Shurygin et. al, 2000) based mainly on the results of paleontological studies was used as a guide of the work presented. Certain well sections and correlation lines are given in rather limited amount. Version of facies zoning of the region updated by the authors is based on the following study results: paleontological, detailed correlation of the deposits, paleogeographic maps published by the authors, and rock composition maps. The results of these studies allowed considerable improving of the mentioned facies zoning and carrying out facies zoning of the Kara Sea for the first time