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Russian Geology and Geophysics

2017 year, number 3-4

GEOCHEMICAL METHODS FOR PREDICTION AND ASSESSMENT OF SHALE OIL RESOURCES (case study of Bazhenov Formation)

M.B. Skvortsov, M.V. Dakhnova, S.V. Mozhegova, A.M. Kirsanov, I.K. Komkov, I.L. Paizanskaya
Russian Research Institute of Petroleum Geology, Shosse Entuziastov 35, Moscow, 105118, Russia
Keywords: Shale oil, Bazhenov Formation, source and reservoir potential, evaluation of resources

Abstract

The paper presents approaches to characterization of shale source rocks using geochemical data for the case of the Bazhenov petroleum system in West Siberia. Regional patterns of oil distribution in the Bazhenov shale are shown to depend on their original total organic carbon (TOC) content and thermal maturity. The existing thermal maturity model for the Bazhenov Formation based on vitrinite reflectance ( R oVt) of nearby beds has been updated using parameters measured by Rock-Eval pyrolysis ( T max, HI, PC, and RC) for the shale itself. The results were used to quantify hydrocarbon resources in different maturity zones. The relationship between total organic carbon and presence of expelled oil found for logged zones in the Bazhenov section allows allocation and quantifying oil resources in unlogged beds.