THE YAKOVLEVSKAYA SUITE OIL-BEARING SANDSTONE FORMATION CONDITIONS IN THE LODOCHNOE OIL FIELD

Abstract

The relevance of the research is caused by the need to expand the Russian Federation resource potential due to increase in the number of hydrocarbon deposits. Today, oil is a mineral resource, which achieved production levels are not adequately provided with developed field’s reserves. The productive reservoirs structure detailed study within the Vankor fields group in the future will provide an opportunity for forecasting and discovering new hydrocarbon deposits within the Lower Cretaceous Siberian deposits. The main aim of the research is to determine the productive sandstone formation conditions according to the core material study, to study the field structure heterogeneity causes and to identify their characteristic signs for the subsequent forecast of the Lower Cretaceous oil deposits in the area of the Krasnoyarsk region. Objects: oil-bearing sandstone layers in the Yakovlevskaya suite, Lodochnoe oil and gas deposit. Methods: thin sections petrographic analysis, grain size analysis, facies and formation analysis, filtration-capacitive properties core study. Results. The Upper and Lower Yakovlevskaya subsuites sandstones material composition was studied by petrographic analysis, their comparative characteristics are given. The post-sedimentation processes influence on the studied sedimentary rock appearance formation is determined. A facies model that most closely describes the productive layers sedimentation conditions is proposed. The influence of facies sedimentation conditions and post-sedimentary rocks transformations on the sandstones filtration-capacitive characteristics is established. The reasons for the carbonated interlayers presence in fluvial deposits are explained. Conclusions are drawn about the possibility of predicting the Lower Cretaceous sediments productivity accumulated in various facies environments, using the Yakovlevskaya suite in Lodochnoe deposit as an example.

Keywords

• sandstone
• diagenesis
• yakovlevskaya suite
• alluvial environment
• krasnoyarsk region