The Lithological and Paleogeographic Features of the Formation of the Lower Miocene of the Northeastern Shelf of Sakhalin Island

Abstract

This paper presents the results of studies of the lithological-facies composition and paleogeographic environments of the formation of the main oil and gas complexes in the northeastern part of the Sakhalin shelf. Based on the results of core studies, an assessment of the reservoir and screening properties of the rocks, which make up the Lower Miocene stratigraphic complex, was carried out. The data on the lithological composition of reservoirs, the nature of cement and the composition of seals for 12 deep exploration wells drilled on the Sakhalin shelf are presented. The studies we carried out made it possible to predict changes in the lithological-facies composition and reservoir properties of the rocks that make up the main oil and gas complexes. There are three categories of zones with different indicators of filtration–capacitive properties.