Effect of biodegradation processes on the composition and structure of asphaltenes in West Siberian oils

Lyubov S. Borisova; Elena A. Fursenko

doi:10.18599/grs.2018.4.301-307

Effect of biodegradation processes on the composition and structure of asphaltenes in West Siberian oils

Переведенное название: Влияние процессов биодеградации на состав и строение асфальтенов нефтей Западной Сибири

Lyubov S. Borisova, Elena A. Fursenko

Кафедра геологии месторождений нефти и газа ГГФ

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

2 Цитирования (Scopus)

Аннотация

Методом ЯМР-спектроскопии в сочетании с определением элементного состава изучены асфальтены биодеградированных нефтей из сеноманских залежей Западной Сибири. Глубина отбора проб варьирует от 680 до 1800 м, пластовые температуры – от 40ºС до 70ºС. Для сравнения использовалась информация об асфальтенах не измененных биодеградацией нефтей разных генотипов. Биодеградированные нефти – очень тяжелые (плотность – 910-950 кг/м3), характеризуются высокими температурами начала кипения (145-270ºС). За счет потери углеводородных компонентов в них содержится больше смол и асфальтенов (9-20%) по сравнению с неизмененными пробами. Анализ элементного состава асфальтенов биодеградированных и не измененных биодеградацией нефтей разных генотипов показал тенденцию к увеличению содержания кислорода в асфальтенах биодеградированных проб, что может быть обусловлено окислением структурных блоков асфальтенов при микробиальном окислении. Для умеренно биодеградированных новоаганских проб террагенно-аквагенного генотипа установлено повышение ароматичности при снижении насыщенности асфальтенов, что может быть свидетельством перераспределения структурных группировок асфальтенов за счет биодеградации. Высокая насыщенность асфальтенов интенсивно биодеградированных губкинской и новопортовской нефтей и, одновременно, высокая замещенность ароматических структур в асфальтенах губкинской нефти (террагенный и аквагенно-террагенный генотип) могут быть связаны с новообразованием асфальтенов при интенсивной биодеградации углеводородных компонентов этих нефтей

Переведенное название	Влияние процессов биодеградации на состав и строение асфальтенов нефтей Западной Сибири
Язык оригинала	английский
Номер статьи	3
Страницы (с-по)	301-307
Число страниц	7
Журнал	Georesursy
Том	20
Номер выпуска	4
DOI	https://doi.org/10.18599/grs.2018.4.301-307
Состояние	Опубликовано - 1 янв 2018

Предметные области OECD FOS+WOS

1.05 НАУКИ О ЗЕМЛЕ И СМЕЖНЫЕ ЭКОЛОГИЧЕСКИЕ НАУКИ

ГРНТИ

52.47 Разработка нефтяных и газовых месторождений
38 ГЕОЛОГИЯ

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@article{cfc09577c2414890868f98ebe4be1e7a,

title = "Effect of biodegradation processes on the composition and structure of asphaltenes in West Siberian oils",

abstract = "NMR spectroscopy in combination with elemental analysis was used to study asphaltenes in biodegraded oils from Cenomanian pools of West Siberia. The sampling depths vary from 680 to 1800 m, formation temperatures – from 40°C to 70°C. For comparison, we used the data on asphaltenes in non-biodegraded oils of different genotypes. Given that biodegraded oils are very heavy (density: 910-950 kg/ m3), they are characterized by high boiling point temperatures (145-270°C). Due to the loss of hydrocarbon components, they have higher resin and asphaltene content (9-20%) compared to non-degraded samples. Elemental analysis of asphaltenes in biodegraded and unaltered oils of different genotypes revealed an increasing trend for oxygen content in the asphaltenes from biodegraded samples, which may result from the oxidation of structural blocks of asphaltenes during microbial oxidation. It was shown that the aromaticity of the moderately biodegraded terrestrial-aquatic Novoaganskaya samples tends to increase with a decrease in asphaltene saturation, suggesting that the redistribution of structural groups of asphaltenes may be caused by biodegradation processes. High saturation of asphaltenes in strongly biodegraded Gubkinskaya and Novoportovskaya oils, along with a high degree of substitution of aromatic compounds in asphaltenes in Gubkinkaya oils (terrestrial and aquatic-terrestrial genotype) can be attributed to the formation of asphaltenes during strong biodegradation of hydrocarbon components in these oils.",

keywords = "Asphaltenes, Biodegradation, Oil, West Siberia, oil, biodegradation, asphaltenes",

author = "Borisova, {Lyubov S.} and Fursenko, {Elena A.}",

note = "This work was supported by the Russian Foundation for Basic Research Project No. 18-05-00786.",

year = "2018",

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day = "1",

doi = "10.18599/grs.2018.4.301-307",

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Effect of biodegradation processes on the composition and structure of asphaltenes in West Siberian oils. / Borisova, Lyubov S.; Fursenko, Elena A.

В: Georesursy, Том 20, № 4, 3, 01.01.2018, стр. 301-307.

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

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T1 - Effect of biodegradation processes on the composition and structure of asphaltenes in West Siberian oils

AU - Borisova, Lyubov S.

AU - Fursenko, Elena A.

N1 - This work was supported by the Russian Foundation for Basic Research Project No. 18-05-00786.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - NMR spectroscopy in combination with elemental analysis was used to study asphaltenes in biodegraded oils from Cenomanian pools of West Siberia. The sampling depths vary from 680 to 1800 m, formation temperatures – from 40°C to 70°C. For comparison, we used the data on asphaltenes in non-biodegraded oils of different genotypes. Given that biodegraded oils are very heavy (density: 910-950 kg/ m3), they are characterized by high boiling point temperatures (145-270°C). Due to the loss of hydrocarbon components, they have higher resin and asphaltene content (9-20%) compared to non-degraded samples. Elemental analysis of asphaltenes in biodegraded and unaltered oils of different genotypes revealed an increasing trend for oxygen content in the asphaltenes from biodegraded samples, which may result from the oxidation of structural blocks of asphaltenes during microbial oxidation. It was shown that the aromaticity of the moderately biodegraded terrestrial-aquatic Novoaganskaya samples tends to increase with a decrease in asphaltene saturation, suggesting that the redistribution of structural groups of asphaltenes may be caused by biodegradation processes. High saturation of asphaltenes in strongly biodegraded Gubkinskaya and Novoportovskaya oils, along with a high degree of substitution of aromatic compounds in asphaltenes in Gubkinkaya oils (terrestrial and aquatic-terrestrial genotype) can be attributed to the formation of asphaltenes during strong biodegradation of hydrocarbon components in these oils.

AB - NMR spectroscopy in combination with elemental analysis was used to study asphaltenes in biodegraded oils from Cenomanian pools of West Siberia. The sampling depths vary from 680 to 1800 m, formation temperatures – from 40°C to 70°C. For comparison, we used the data on asphaltenes in non-biodegraded oils of different genotypes. Given that biodegraded oils are very heavy (density: 910-950 kg/ m3), they are characterized by high boiling point temperatures (145-270°C). Due to the loss of hydrocarbon components, they have higher resin and asphaltene content (9-20%) compared to non-degraded samples. Elemental analysis of asphaltenes in biodegraded and unaltered oils of different genotypes revealed an increasing trend for oxygen content in the asphaltenes from biodegraded samples, which may result from the oxidation of structural blocks of asphaltenes during microbial oxidation. It was shown that the aromaticity of the moderately biodegraded terrestrial-aquatic Novoaganskaya samples tends to increase with a decrease in asphaltene saturation, suggesting that the redistribution of structural groups of asphaltenes may be caused by biodegradation processes. High saturation of asphaltenes in strongly biodegraded Gubkinskaya and Novoportovskaya oils, along with a high degree of substitution of aromatic compounds in asphaltenes in Gubkinkaya oils (terrestrial and aquatic-terrestrial genotype) can be attributed to the formation of asphaltenes during strong biodegradation of hydrocarbon components in these oils.

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KW - asphaltenes

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