Section editor – PhD in geology and mineralogy Prischepa O.M.
Article # 11 displayed on website on 11/21/2006
19 p.
pdf  Evolution of the hydrocarbon composition of the bitumens during catagenesis according to laboratory stepwise thermolysis data
Reedition
The features of the composition of the residual organic matter and thermo-bitumens from five samples of organic matter (sapropelite type) are investigated by stepwise thermolysis. Four samples (shale from Undory, Aleksinac, Suzak fields and dispersed organic matter of Kuma Formation’s mudstone) are presented by organic matter of kollo-algin type, while the fifth one (shale from Boltysh field) – is presented by organic matter of tallomosorbomikstinit type. Refractive index of the micro-components in insoluble organic matter increases as well as thermolysis temperature, with varying intensity depending on the micro-component composition of the original organic matter. The refractive index of the insoluble organic matter of kollo-algin type at the thermolysis stage 400C was equal MK3 - 4, while tallomo-algin type was characterized by not more than MK2 - 3. As for the thermolysis outcome for Undora shales, the maximum falls on the 250-300C step, whereas the same one for Aleksinac is equal to 350C. The organic matter from Kuma formation and Suzak field shale generated thermobitumens uniformly from 300C to 400C, as opposed to Boltysh field shale with 400C. What is more in the latter’s insoluble part there was still 16% of lipid component. It is proved by the chloroform thermo-bitumen study that the evolution of the chloroform thermo-bitumen and parameters of the individual composition are similar to those of the natural evolution of the bitumens for organic matter of the same type.
Key words: organic matter, shales, mudstones, North Caucasus, catagenesis, thermolysis.

The revised article published in the collection of scientific papers «Study of oil and gas generation characteristics of rocks organic matter by thermal methods». Leningrad: VNIGRI, 1988. P. 23-47.
article citation Shimansky V.K., Shapiro A.I. Evolution of the hydrocarbon composition of the bitumens during catagenesis according to laboratory stepwise thermolysis data // Neftegazovaya Geologiya. Teoriya I Praktika. – 2006. - V.1. - http://www.ngtp.ru/10/11.pdf