litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2022-22-6-840-846litosphere-1761Research ArticleСтатьиArticlesОбразование углеводородов в системах CaCO3–FeO–H2O–SiO2 и Fe3C–H2O–SiO2 при термобарических условиях верхней мантииHydrocarbon formation in CaCO3–FeO–H2O–SiO2 and Fe3C–H2O–SiO2 systems under thermobaric conditions of the upper mantleСеровайскийА. Ю.SerovaiskiiA. Yu.

119991, г. Москва, Ленинскиий просп., 65, корп. 1

65-1 Leninsky av., 119991 Moscow

alexandrserov@gmail.comКучеровВ. Г.KutcherovV. G.

119991, г. Москва, Ленинскиий просп., 65, корп. 1; Стокгольм, 11428

65-1 Leninsky av., 119991 Moscow; Stockholm, 10044

РГУ нефти и газа (НИУ) имени И.М. ГубкинаРоссияNational University of Oil and Gas “Gubkin University”Russian FederationРГУ нефти и газа (НИУ) имени И.М. Губкина; Королевский Технологический институт KTHРоссияNational University of Oil and Gas “Gubkin University”; KTH Royal Institute of TechnologyRussian Federation202207012023226840846Copyright © Серовайский А.Ю., Кучеров В.Г., 20232023Серовайский А.Ю., Кучеров В.Г.Serovaiskii A.Y., Kutcherov V.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1761Объект исследования

Объект исследования. Исследовано возможное влияние среды SiO2 как наиболее распространенного компонента мантии на глубинный абиогенный синтез углеводородов в системах CaCO3–FeO–H2O и Fe3C–H2O в термобарических условиях, соответствующих условиям в верхней мантии.

Материал и методы

Материал и методы. Эксперименты проводились с помощью установки высокого давления в камерах типа “Тороид” в термобарическом интервале 2.0–4.0 ГПа и 220– 750°С. В качестве доноров углерода использовались кальцит CaCO3 и цементит Fe3C, в качестве донора водорода – вода Н2О, в качестве среды – кварц SiO2. Анализ полученных продуктов химической реакции осуществлялся методами газовой хроматографии и рентгенофазной дифракции.

Результаты

Результаты. В ходе проведенных экспериментов во всем исследуемом термобарическом интервале были получены смеси легких алканов с преобладанием метана. Состав углеводородных систем, полученных в присутствии SiO2, сходен с составом смесей, полученных при таких же термобарических параметрах без SiO2, и зависел только от температур и давлений синтеза. Результаты рентгенофазового анализа твердых продуктов показали превращение кварца в коэсит при 400 и 750°С.

 Выводы

 Выводы. Качественный и количественный состав углеводородных систем, образующихся при абиогенном синтезе углеводородов в присутствии SiO2, соответствует результатам аналогичных экспериментов без SiO2, но общий выход углеводородных систем в среде SiO2 снижается. Зависимость состава полученных углеводородных систем от термобарических условий синтеза сохраняется в среде SiO2.

Research subject

Research subject. The possible influence of the SiO2 environment as the most common component of the mantle on the deep abiogenic synthesis of hydrocarbons in the CaCO3–FeO–H2O and Fe3C–H2O systems under thermobaric conditions corresponding to those in the upper mantle is investigated.

Materials and methods

Materials and methods. Experiments were carried out using a high-pressure unit in Toroid-type chambers across the thermobaric range of 2.0–4.0 GPa and 220–750°C. CaCO3 and Fe3C were used as carbon donors, H2O was used as a hydrogen donor, and SiO2 was used as an environment. The synthesized products were analyzed by gas chromatography and X-ray diffraction.

Results

Results. Across the entire temperature and pressure range used, mixtures of light alkanes with the predominance of methane were obtained. The composition of the hydrocarbon systems synthesized in the presence of SiO2 was similar to that obtained at the same thermobaric parameters without SiO2, depending exclusively on the temperature and pressure of synthesis. The conducted X-ray diffraction analysis of solid products demonstrated transformation of quartz into coesite at 400°C and 750°C.

Conclusions

Conclusions. According to the conducted investigation, the qualitative and quantitative composition of hydrocarbon systems formed during the abiogenic synthesis of hydrocarbons in the presence of SiO2 corresponds to the results of similar experiments without SiO2. However, the total yield of the hydrocarbon systems in the SiO2 environment decreases. The dependence of the composition of the synthesized hydrocarbon systems on the thermobaric conditions of synthesis remains in the SiO2 environment.

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The authors declare that there are no conflicts of interest present.