FEATURES OF THE CARBON ISOTOPE COMPOSITION OF ORGANIC MATTER AND CARBON AND OXYGEN CARBONATE CONSTITUENT OF OIL AND GAS PRODUCING DEPOSITS OF THE CAMBRIAN OF THE SIBERIAN PLATFORM

Abstract

The paper presents data on the carbon (δ13С) and oxygen (δ18О) isotopic composition of the carbonate rock constituent (CRC) and carbon (δ13C) of dispersed organic matter (SOM) of rocks of the Shumnaya, Inikan and Kuonamka Formations of the Lower-Middle Cambrian of the Siberian Platform. Dependence of the carbon and oxygen isotopic composition of CRC on the facies subtype of domanicoid deposits of the Cambrian was revealed. The interrelation of the carbon isotope composition of DOM with depositional conditions of sediments of the Lower and Middle Cambrian was considered. In the south-east of the Siberian Platform, Lower Cambrian carbonate deposits with carbon anomalous isotopic composition of CRC (δ13Сср = 6,6 ‰) and carbon of DOM (δ13С = –36,5 ‰) were found.