Образование Углеводородных Газов Микробным Сообществом Донных Осадков Оз. Байкал

Pavlova, Oksana; Букин, С. В.; Ломакина, А. В.; Калмычков, Г. В.; Ivanov, Valentin; Морозов, Ю В; Погодаева, Т. В.; Pimenov, Nikolay; Земская, Т И

doi:10.7868/s0026365614060147

Микробиология

2014

DOI: 10.7868/s0026365614060147

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Образование Углеводородных Газов Микробным Сообществом Донных Осадков Оз. Байкал

Oksana Pavlova¹,

С. В. Букин²,

А. В. Ломакина³

et al.

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Sources of Hydrocarbon Gases in the Mud Volcano Kedr, Southern Basin of Lake Baikal: Results of Experimental Investigations

Krylov,

Khlystov,

Semenov

et al. 2023

Litologiâ i poleznye iskopaemye

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Outcrops of the Oligocene-Pliocene coal-bearing Tankhoi suite are traced along the southern shore of Lake Baikal and submerge under its Southern Basin, in which several hydrate-bearing zones of focused discharge of hydrocarbon fluids have been found. To test the hypothesis that coals of the Tankhoi Suite can be sources of hydrocarbon gases in these zones, we collected coal samples from the Shakhterskaya Gorka outcrop. The experiment on gas generation from the selected samples was carried out in a special autoclave at a temperature of 90°C for eight months. This paper presents the results of this study, which confirm the important role of gas generation processes from coals in the formation of fluids in the Kedr mud volcano. Further migration of gases was accompanied by biodegradation and the formation of secondary microbial methane due to CO2 reduction. This was one of the reasons for the observed carbon isotopic pattern in methane (heavier than ‒50‰ VPDB) and carbon dioxide (positive values) taken from near-surface sediments and hydrates of the Kedr mud volcano, as well as for the significant enrichment of authigenic siderites in the heavy 13C isotope.

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Sources of Hydrocarbon Gases in the Mud Volcano Kedr, Southern Basin of Lake Baikal: Results of Experimental Investigations

Krylov,

Khlystov,

Semenov

et al. 2023

Litologiâ i poleznye iskopaemye

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Anaerobic oxidation of oil by microbial communities of bottom sediments of a natural oil seepage site (Bolshaya Zelenovskaya, Middle Baikal)

Pavlova,

Bukin,

Izosimova

et al. 2024

Microbiology

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The diversity of microbial communities and potential functional activity in anaerobic processes of oil degradation of bottom sediments was determined in the area of the Bolshaya Zelenovskaya oil seepage site (lake Baikal). When microorganisms of subsurface and deep sediment were cultivated in enrichment cultures containing oil and various electron acceptors for one year at 10ºC, the concentration of n-alkanes decreased by 1.2–2 times, and PAHs by 2.2–2.8 times. The conversion of hydrocarbons was accompanied by the generation of hydrocarbon gases (methane, ethane). The microbial community of the subsurface sediment was characterized by greater bacterial diversity than that of the deep sediment and was represented by microorganisms specialized in the decomposition of a wide range of substrates, including petroleum hydrocarbons. The deep layers of sediment were dominated by Atribacterota, Caldisericota and Bathyarchaeia (Thermoproteota), as well as representatives of the “rare biosphere” Elusimicrobiota and Candidatus Hadarchaeota. Among the main participants in the degradation of oil in bottom sediments of the lake. Representatives of the phyla Bacillota, Pseudomonadota, Chloroflexota, Actinomycetota, Desulfobacterota, Atribacterota, Halobacteriota and Bathyarchaeia (Thermoproteota) can be classified as Baikal.

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Образование Углеводородных Газов Микробным Сообществом Донных Осадков Оз. Байкал

Cited by 2 publications

References 0 publications

Sources of Hydrocarbon Gases in the Mud Volcano Kedr, Southern Basin of Lake Baikal: Results of Experimental Investigations

Sources of Hydrocarbon Gases in the Mud Volcano Kedr, Southern Basin of Lake Baikal: Results of Experimental Investigations

Anaerobic oxidation of oil by microbial communities of bottom sediments of a natural oil seepage site (Bolshaya Zelenovskaya, Middle Baikal)

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