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TRANSFORMATION OF ORGANIC MATTER OF HIGH-CARBON ROCK FROM DOMANIC DEPOSITS OF THE ROMASHKINO OIL FIELD IN DIFFERENT ENVIRONMENTS OF HYDROTHERMAL SYSTEM
Abstract
In model experiments, the influence of various media on the degree of transformation of kerogen of the Domanic rock in hydrothermal processes was studied. The object of the study was a sample of the rock, from the interval of depths of 1712.5-1718.5 m of the Semiluki-Bureg (Domanic) deposits of the Berezovskaya area of the Romashkinsky deposit, which is a dark gray marl alternating with limestone. The content of OM in the rock is 11.73%, according to the thermal analysis data, a significant part of which (9.56%) is insoluble kerogen. Autoclave experiments were carried out at a temperature of 300 В° C in neutral, hydrogen and carbon dioxide media with a content of 50% water in the reaction system to the weight of the sample weighed in the experiment. The pressure of the vapor-gas mixture in the experiments was about 4 MPa. For all reaction media under the influence of hydrothermal factors, the general regularity is observed: the content of kerogen in rocks decreases and the yield of free hydrocarbons extracted from the rocks by organic solvents increases. In the extracts of SARA analysis, the content of saturated hydrocarbons increases due to the decrease in the content of tar and aromatic hydrocarbons. The most noticeable decrease in tar is observed in a carbon dioxide medium with an almost doubling of the content of asphaltenes in products of experiments, from 12.0 to 27.48%, compared to the initial extract. In the initial extract from the Domanic rock and the test products, asphaltenes are present as two fractions containing ordinary asphaltenes soluble in aromatic solvents and their modified structures such as carbenes and carboides insoluble in toluene due to their more condensed structure with fewer aliphatic substituents. The most intensive formation of carbenes and carboides occurs during the degradation of kerogen in a hydrogen medium, less intense - in a carbon dioxide medium. Differences in the structure of asphaltenes and carbene-carboides are revealed.
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