Authors:T. Yusupova, L. Petrova, R. Mukhametshin, G. Romanov, T. Foss and Yu. Ganeeva
The core samples of oil- and bitumen-containing rocks from Tatarstan's deposits of different ages were studied by thermal
analysis methods (DTA, TG, DTG). Based on the obtained data, a procedure was elaborated for determining the enclosed organic
matter content and the index of its fraction composition.
A significant increase of the organic matter content in the core and its enrichment in high-molecular aromatic structures
were shown to occur for the oil-containing rock samples when passing from the Devonian to Carboniferous and Permian deposits.
The core samples of the Devonian oil-containing rocks may be divided into three groups: the samples taken from the zones where
waste water flooding has been started relatively recently (1), or fresh water flooding has been carried on for a long time
(2) and the samples of rock containing clay minerals as impurities. Thus, thermal analysis can be used in geochemical studies
to identify the organic matter enclosed by oil- and bitumen-containing rocks.