Olefins of radiogenic origin in crude oils

Frolov, E.B.; Smirnov, M. B.; Melikhov, V. A.; Vanyukova, N. A.

doi:10.1016/s0146-6380(98)00081-3

Cited by 36 publications

(5 citation statements)

References 13 publications

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“…DISTRIBUTION In contrast to the previously investigated basins, the content of unsaturated compounds in the majority (46 out of 86) of the North Caucasus crude oil samples proved to be below the detection limit (0.002% H dbl with respect to the total hydrogen in the sample). This finding corroborates our previous data obtained by high pressure liquid chromatography in combination with ozonolysis [16]. This explains the incompleteness of the H dbl data in Table 2.…”

Section: Resultssupporting

confidence: 92%

Distribution Patterns of Main Structural-Group Parameters of Crude Oils from North Caucasus Oil-and-Gas Basin According to 1H NMR Data

Smirnov

Vanyukova

2022

Pet. Chem.

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Using the 1H NMR examination of a representative set of crude oils (86 samples, 54 oil fields and exploration areas) from the North Caucasus oil-and-gas basin, we obtained, for the first time, the structural-group composition of crude oils over the entire basin. Distribution density plots were presented for all the composition parameters measured. It was demonstrated that, because none of the parameters obeys normal distribution, non-parametric statistical analysis is needed for the data processing. In particular, medians and median confidence intervals (the latter being determined by signed-rank test), rather than means or root-mean-square deviations, should be relied upon. The North Caucasus oils were found to have a markedly lower content of aromatics (both monocyclic and bi-/polycyclic) than the crude oils from Western Siberia and Volga–Urals. Compared with the Eastern Siberia basin, the North Caucasus oils are distinguished by a slightly higher presence of bicyclic and polycyclic aromatics. At the same time, the North Caucasus oils exhibit the highest content of normal and monomethylated alkanes among the four basins under consideration. The North Caucasus oils were classified into three stratigraphic groups according to their oil composition. The first group consists of Triassic and Jurassic reservoirs. These crude oils have the lowest content of aromatics and the highest content of normal and monomethylated alkanes. The second group is the Cretaceous sediments, and the third group includes Paleogenic and Neogenic deposits. The content of aromatics increases consistently from the bottom to the top of the section.

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Section: Resultssupporting

confidence: 92%

Distribution Patterns of Main Structural-Group Parameters of Crude Oils from North Caucasus Oil-and-Gas Basin According to 1H NMR Data

Smirnov

Vanyukova

2022

Pet. Chem.

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“…It should be noted that olefins were also identified in bituminoids of terragenic OM, the Devonian oils of Canada, Paleozoic oils, and the Mezo-Cenozoic oils of Russia …”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that olefins were also identified in bituminoids of terragenic OM, 76 the Devonian oils of Canada, 77 Paleozoic oils, 78 and the Mezo-Cenozoic oils of Russia. 79 The results of the comparative analysis show that some compounds identified in the low-polar fractions of maltenes are also included in the structure of HMA molecules.…”

Section: Energy and Fuelsmentioning

confidence: 98%

Resins and Asphaltenes of Light and Heavy Oils: Their Composition and Structure

et al. 2019

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The complex of physicochemical methods of analysis (elemental analysis, cryoscopy in benzene, IR and 1H NMR spectroscopies, structural group analysis, gas chromatography–mass spectrometry, and selective chemical cleavage of sulfide and ether bonds) is used to comparatively characterize resins and asphaltenes of light and heavy oils. Attention is paid to the study of their structural group composition and the composition of moieties bound in molecules of resin–asphaltene substances (RAS) through ether and sulfide bridges, as well as the composition of compounds occluded by asphaltene molecules and nitrogen bases of resins. It is found that resins and asphaltenes of the heavy oil are characterized by higher average molecular masses and large overall sizes of mean molecules, due to the increased content of aromatic cycles in the naphthenic–aromatic system. The similar sets of linear and branched alkanes, alkylcyclopentanes, alkylcyclohexanes, steranes, mono- and disubstituted alkylbenzenes, and dibenzothiophenes identified in occluded compounds and products of chemolysis of resins and asphaltenes under study suggest the presence of most of these compounds as structural fragments in RAS molecules of light and heavy crude oils under study. Alkyl-substituted quinolines and benzoquinolines are identified in the nitrogen bases of resins. The feature of the light oil is the presence of “sulfur-bound” alkenes and polycycloalkenes in the structure of its asphaltenes. The findings expand our understanding of the structure of petroleum resins and asphaltenes. They can be used to simulate their structure in developing new controlled methods for processing hydrocarbon feedstock.

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“…Alkenes are thermally unstable, are considered to be intermediate products during the oil production, and are commonly found in pyrolysates of low-maturity and immature kerogen, ,,, but they are rarely found in crude oil and rock extract. Some of the cases with alkenes were assumed to be produced through abiogenic alterations, such as the radiolytic dehydrogenation of saturated hydrocarbons, , or thermal effects of igneous intrusions on immature OM . The former is related to radioactivity, while the latter is rapid pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

“…55 The former is related to radioactivity, while the latter is rapid pyrolysis. If alkenes are produced through the dehydrogenation of irradiated saturated hydrocarbons, 54 the amounts should have a positive relationship with the H 2 yield and irradiation dose. However, the alkene amounts in sample KU3 (which had the highest radiation dose) (see Table 1) were lower than those in other kerogen samples (Figure 4).…”

Section: Energy and Fuelsmentioning

confidence: 99%

Oil Generation from the Immature Organic Matter after Artificial Neutron Irradiation

et al. 2019

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Organic-rich shale often receives high doses of radiation from radionuclides, mostly uranium (U). Natural decay of U releases particles and energy simultaneously. Thermal stress is considered to be conducive to organic matter (OM) maturation and petroleum generation and has always been taken into account in the simulation of basin thermal evolution. However, for the particles and their bombardment, the effect is still unclear. The main reason is that the half-life of U is up to 4.5 billion years; it is impossible to monitor the effect of U natural decay in the laboratory. Here, we implemented a thermal neutron irradiation experiment in a nuclear reactor using immature Type-II organic matter, to activate and accelerate the natural decay of U. Radiogenic heat was designed to be removed with the circulating water at room temperature to reduce the potential effect of thermal degradation. Oil generated from the irradiated organic matter confirmed that particle bombardment from the U natural decay promoted oil production, with a maximum yield of 19.5 mg g −1 TOC. The oil produced was rich in asphaltene, aromatic compounds, and high-molecular-weight compounds, and also had abundant low-maturity and intermediate products (e.g., alkenes, prist-1-ene, C 27 -hop-17(21)-ene, and moretanes) in the saturated fraction. These results indicated that particle bombardment led to the radiolytic cracking of C−C bonds, different from the traditional thermal degradation processes. Therefore, as a function of time and content, the natural irradiation from U decay should be taken into account, when evaluating the petroleum resources of Paleozoic and Proterozoic U-rich source rocks.

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Olefins of radiogenic origin in crude oils

Cited by 36 publications

References 13 publications

Distribution Patterns of Main Structural-Group Parameters of Crude Oils from North Caucasus Oil-and-Gas Basin According to 1H NMR Data

Distribution Patterns of Main Structural-Group Parameters of Crude Oils from North Caucasus Oil-and-Gas Basin According to 1H NMR Data

Resins and Asphaltenes of Light and Heavy Oils: Their Composition and Structure

Oil Generation from the Immature Organic Matter after Artificial Neutron Irradiation

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