Abstract
This present paper investigates the conversion of organic matter in carbonate rocks of the Semiluksko-Mendymsky horizon Volga-Ural Basin under hydrothermal conditions with excess water in subcritical conditions at 613–653 K and 170–200 Bar. It has been found that the content of hydrocarbon extracts increases (relatively) which indicates the oil-generating potential of the studied deposits. Besides, it has been shown that organic matter undergoes oxidation reactions under hydrothermal conditions, as indicated by the presence of oxidized structures in the extracted hydrocarbons. Moreover, our results indicate that increasing the temperature and pressure of the used hydrothermal fluid leads to an increase in the content of n-alkanes C25-C30 and asphaltenes in the extracts. On the other hand, it has been found that saturated, aromatic hydrocarbons and resins content decreases at this stage. The obtained data about the geochemical parameters dependencies of the hydrocarbons obtained from the studied carbonate rock on temperature and pressure associated to hydrothermal effect show possible pathways of migration, genesis, and formation of hydrocarbon deposits.
Highlights
A substantial decrease in conventional oil and gas reserves [1–5] led to the establishment of three potential development trends in global energy [6]
The first trend is related to the involvement of alternative fuel resources in the area [7–13]; the second is related to deeper processing of conventional hydrocarbon feedstock to obtain marketable products with high added value [14–21]; and the third is related to the increasing interest in unconventional oil and gas resources [22–26]
A further increase in the temperature and pressure of the hydrothermal fluid to 653 K and 200 Bar leads to a decrease in pore volume to 0.1164 cm3/g and specific surface area to 0.752 m2/g according to BET and to 0.622 m2/g according to BJH
Summary
A substantial decrease in conventional oil and gas reserves [1–5] led to the establishment of three potential development trends in global energy [6]. The first trend is related to the involvement of alternative fuel resources in the area [7–13]; the second is related to deeper processing of conventional hydrocarbon feedstock to obtain marketable products with high added value [14–21]; and the third is related to the increasing interest in unconventional oil and gas resources [22–26]. Innovative technologies for the development of hard-to-recover hydrocarbon resources represents a highly relevant topic nowadays [27–29]. Alternative hydrocarbon resources, such as carbonate deposits containing organic matter, are widespread in Russia, China, Jordan, Brazil, Morocco, Australia, Estonia, USA, Canada, Zaire, Italy, France, etc. Extracting hydrocarbons from organo-mineral complexes of carbonate deposits faces serious issues which are currently receiving more and more attention all over the world
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