Rocks of the Bazhenovo and Abalak Formations, Central Krasnoleninsk Arch, Western Siberia: Composition, Structure, and Formation Conditions

The finding of hydrocarbon accumulations in Upper Jurassic rocks of the Krasnoleninsk Arch, which were previously considered fluid trap and oil source sediments, stimulated us to have a new look at these rocks. The analysis of geophysical data on boreholes revealed that reservoirs in Upper Jurassic rocks are mainly represented by siliceous and carbonate varieties, which were named potentially productive beds. This work presents results of the detailed investigation of the lithology of Upper Jurassic rocks for distinguishing different rock types (including potentially productive beds) with the aim of their correlation and prediction of lateral distribution.