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

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2023-11-14 DOI:10.1134/S0024490223700335

A. A. Krylov, O. M. Khlystov, P. B. Semenov, A. K. Sagidullin, S. A. Malyshev, S. V. Bukin, O. N. Vidischeva, A. Yu. Manakov, Z. R. Ismagilov

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Abstract—

Outcrops of the coal-bearing Tankhoi Formation (Oligocene–Pliocene), traced along the southern shore of Lake Baikal, submerge under its Southern Basin, where several hydrate-bearing zones of the focused hydrocarbon fluid discharge have been found. To test the hypothesis that coals of the Tankhoi Formation can be the sources of hydrocarbon gases in these zones, we collected coal samples from the Shakhterskaya Gorka outcrop. 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 obtained results, which confirm an important role of the process of gas generation from coals in the formation of fluids in the Kedr mud volcano. The further migration of gases was accompanied by the biodegradation and formation of secondary microbial methane due to CO₂ reduction. This was one of the reasons for the carbon isotopic pattern observed in methane (heavier than –50‰ VPDB) and carbon dioxide (positive values) taken from the 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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贝加尔湖南部盆地克德尔泥火山烃类气体来源:实验研究结果

摘要/ abstract摘要:沿贝加尔湖南岸示踪的渐新世—上新世煤系坦科伊组露头淹没于贝加尔湖南岸盆地之下，在该盆地中发现了几个油气流体集中排放的含水合物带。为了验证Tankhoi组的煤可能是这些地区碳氢化合物气体的来源的假设，我们从Shakhterskaya Gorka露头收集了煤样品。所选样品在90°C的特殊高压灭菌器中进行了8个月的产气实验。本文介绍了研究结果，证实了煤生气过程在克德尔泥火山流体形成过程中的重要作用。气体的进一步迁移伴随着二氧化碳的减少而产生的生物降解和次生微生物甲烷的形成。这是克德尔泥火山近地表沉积物和水合物中甲烷(大于-50‰VPDB)和二氧化碳(正值)的碳同位素模式，以及重13C同位素中自生菱石的显著富集的原因之一。

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来源期刊

Lithology and Mineral Resources 地学-地球化学与地球物理

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.