georesГеоресурсыGeoresources1608-50431608-5078Georesursy LLC10.18599/grs.2024.4.13geores-415Research ArticleГЕОЛОГО-ГЕОХИМИЧЕСКИЕ ИССЛЕДОВАНИЯ, ПОИСК И РАЗВЕДКА МЕСТОРОЖДЕНИЙ ПОЛЕЗНЫХ ИСКОПАЕМЫХGEOLOGICAL AND GEOCHEMICAL RESEARCH, PROSPECTING AND EXPLORATION OF DEPOSITSГеолого-геохимическая характеристика естественных проявлений углеводородов континентальной окраины юго-западного Крыма, бухта ЛаспиGeological and Geochemical Characteristics of Hydrocarbon Seeps in the Continental Margin of Southwestern Crimea, Laspi BayКрасноваЕ. А.KrasnovaE. A.

Елизавета Андреевна Краснова – кандидат геол.-минерал. наук, старший научный сотрудник кафедры геологии и геохимии горючих ископаемых, МГУ имени М.В. Ломоносова; старший научный сотрудник института геохимии и аналитической химии им. В.И. Вернадского РАН.

119234, Москва, Ленинские горы, д. 1

Elizaveta A. Krasnova – Cand. Sci. (Geology and Mineralogy), Senior Researcher of Department of Geology and Geochemistry of oil and gas, Lomonosov MSU; Senior Researcher, Vernadsky Institute of Geochemistry and Analytical Chemistry of the RAS.

1 Leninskie gori, Moscow, 119234

e.krasnova@oilmsu.ruБудниковА. А.BudnikovA. A.

Андрей Александрович Будников – кандидат физ.-мат. наук, старший научный сотрудник кафедры физики моря и вод суши, физический факультет.

119234, Москва, Ленинские горы, д. 1, стр.2

Andrey A. Budnikov – Cand. Sci. (Physics and Mathematics), Senior Researcher, Department of Physics of Sea and Inland Waters.

Build. 2, 1 Leninskie gori, Moscow, 119234

aa.budnikov@physics.msu.ruИвановаИ. Н.IvanovaI. N.

Ирина Николаевна Иванова – кандидат физ.-мат. наук, доцент кафедры физики моря и вод суши, физический факультет.

119234, Москва, Ленинские горы, д. 1, стр.2

Irina N. Ivanova – Cand. Sci. (Physics and Mathematics, Assistant Professor, Department of Physics of Sea and Inland Waters.

Build. 2, 1 Leninskie gori, Moscow, 119234

ivair@yandex.ruХурчакА. И.KhurchakA. I.

Алена Игоревна Хурчак – ведущий инженер отдела радиационной и химической биологии.

299011, Севастополь, пр. Нахимова, д. 2

Alena I. Khurchak – Lead Engineer of the Department of Radiation and Chemical Biology.

2 Nakhimova av., Sevastopol, 299011

alenakhurchak@ibss-ras.ruГрязноваА. С.GryaznovaA. S.

Анастасия Сергеевна Грязнова – младший научный сотрудник.

119991, Москва, ул. Косыгина, д. 19

Anastasia S. Gryaznova – Junior Researcher.

19 Kosygin st., Moscow, 119991

a.gryaznova@oilmsu.ruКрыловО. В.KrylovО. V.

Олег Владимирович Крылов – кандидат геол.-минерал. наук, доцент кафедры геологии и геохимии горючих ископаемых.

119234, Москва, Ленинские горы, д. 1

Oleg V. Krylov – Cand. Sci. (Geology and Mineralogy), Associate Professor of the Department of Geology and Geochemistry of oil and gas.

1 Leninskie gori, Moscow, 119234

krylov@geol.msu.ruМалаховаТ. В.MalakhovaT. V.

Татьяна Владимировна Малахова – кандидат биол. наук, старший научный сотрудник отдела радиационной и химической биологии.

299011, Севастополь, пр. Нахимова, д. 2

Tatiana V. Malakhova – Cand. Sci. (Biology), Senior Researcher of the Department of Radiation and Chemical Biology.

2 Nakhimova av., Sevastopol, 299011

t.malakhova@ibss-ras.ruМосковский государственный университет имени М.В. Ломоносова; Институт геохимии и аналитической химии им. В.И. Вернадского РАНРоссияLomonosov Moscow State University; Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of SciencesRussian FederationМосковский государственный университет имени М.В. ЛомоносоваРоссияLomonosov Moscow State UniversityRussian FederationИнститут биологии южных морей имени А.О. Ковалевского РАНРоссияA.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of SciencesRussian FederationИнститут геохимии и аналитической химии им. В.И. Вернадского РАНРоссияVernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of SciencesRussian Federation20243012202426483100Copyright © Краснова Е.А., Будников А.А., Иванова И.Н., Хурчак А.И., Грязнова А.С., Крылов О.В., Малахова Т.В., 20242024Краснова Е.А., Будников А.А., Иванова И.Н., Хурчак А.И., Грязнова А.С., Крылов О.В., Малахова Т.В.Krasnova E.A., Budnikov A.A., Ivanova I.N., Khurchak A.I., Gryaznova A.S., Krylov О.V., Malakhova T.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.geors.ru/jour/article/view/415

В 2023 году в ходе экспедиционных работ в прибрежной области бухты Ласпи (юго-западное побережье Крыма) были проведены комплексные исследования мелководных метановых газовыделений. Исследования включали определение компонентного и изотопного состава пузырькового газа, измерение концентрации растворенного в воде метана, оценку величины пузырьковых потоков, а также измерение гидрофизических параметров. Впервые подобные комплексные работы были проведены в разные сезоны года для оценки межсезонной и суточной изменчивости геохимических характеристик мелководных сипов. Полученные результаты изотопного состава углерода метана и этана изученных образцов пузырькового газа (δ¹³Cсредн = –36.0 ± 0.8‰, δ¹³Cсредн = –37.5 ± 0.2‰ соответственно) указывают на их миграционное (термокаталитическое) происхождение. установлено, что метановые сипы Крымского побережья сравнительно малодебитные: индивидуальный удельный поток от одного точечного источника пузырькового газа в среднем составлял 10 м³ год⁻¹. Временная динамика концентрации растворенного СН4 над сипом, а также изменение изотопного соотношения δ¹³C/(СН4) пузырькового газа свидетельствуют о постоянстве процесса во времени и отсутствии связи с внешними гидрологическими изменениями в акватории. Изотопные отношения углерода в метане и этане демонстрируют, что флюиды генерировались органическим веществом морского генезиса, одним из источников которого могли служить верхнеэоценовые и олигоценовые отложения в Западно-Черноморском бассейне.

In 2023, comprehensive studies of shallow-water methane gas emissions were conducted during expeditionary work in the coastal area of Laspi Bay (southwestern coast of Crimea). The research included determining the component and isotopic composition of bubble gas, measuring methane concentration in the gas emission area, estimating bubble flux rates, and measuring hydrophysical parameters above the seep site. The obtained results of the carbon isotopic composition of methane and ethane in the studied samples corresponded to (δ13Cmean = –36.0 ± 0.8‰, δ13Cmean = –37.5 ± 0.2‰, respectively) and indicate the presence of thermocatalytic methane migration along fault systems. It was found that the methane seeps of the Crimean coast are relatively low-flow, with a specific flux ranging from 5 to 10 m3 year-1 from an individual seep. The presented temporal dynamics of dissolved СН4 concentration above the seep and changes in the isotopic ratio of δ13C-СН4 in bubble gas indicate the constancy of the process over time and the absence of connection with external hydrological changes in the water area. The obtained ratios of the carbon isotopic composition of methane and ethane demonstrate that the gas mixture was most likely generated from source organic matter of marine origin, and one of the main sources of hydrocarbon fluids is the Upper Eocene and Oligocene deposits in the Western Black Sea basin.

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