INFLUENCE OF HYDROTHERMAL IMPACT AND PROLONGED EXTRACTION ON GENERATION OF HYDROCARBONS FROM KEROGEN OF DOMANIC ROCK
In the work on the example of a sample of Domanic carbonate-siliceous rock from sediments of the Semiluki-Mendym horizon of the Romashkino oil field shows the effect of a three-stage prolonged extraction with a mixture of organic solvents on the generation of petroleum hydrocarbons from it, before and after exposure to hydrothermal factors on the rock. The experiment on the hydrothermal effect on the rock was carried out in a carbon dioxide medium at a temperature of 300°C and a pressure in the system of 15 MPa. After hydrothermal treatment of the rock, the highest yield of the extract is observed at the first stage of extraction (20 hours), which made it possible to extract 6 times more extract than from the original rock. As a part of the products of the experiment, the content of asphaltenes decreases and the content of saturated and aromatic hydrocarbons increases; as a result of the destruction of kerogen, high-carbonaceous coals substances such as carbene-carboids appear. At the second stage of extraction (68 hours), the yield of the extract from the source rock significantly increases, in which, as in the extract after hydrothermal exposure to the rock, the content of saturated hydrocarbons increases several times. At the third extraction stage (116 hours), tar-asphaltene components and polycyclic aromatic hydrocarbons are extracted from the source rock, and after hydrothermal treatment, mainly asphaltenes are extracted from the rock. As a result, prolonged extraction made it possible to increase the yield of the extract from the source rock by 3 times, and in combination with hydrothermal exposure to the rock, by 7 times The presence of the hydrocarbon conservation effect in the kerogen structure was confirmed and the possibility of generating an additional amount of hydrocarbons from Domanic rock, differing in group and hydrocarbon composition, depending on the hydrothermal effect and the duration of long extraction, was shown.