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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">geology</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Геология и разведка</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of higher educational establishments. Geology and Exploration</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0016-7762</issn><issn pub-type="epub">2618-8708</issn><publisher><publisher-name>Sergo Ordzhonikidze Russian State University for Geological Prospecting</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32454/0016-7762-2025-67-4-39-48</article-id><article-id custom-type="elpub" pub-id-type="custom">geology-1228</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ГЕОЛОГИЯ И РАЗВЕДКА МЕСТОРОЖДЕНИЙ УГЛЕВОДОРОДОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>GEOLOGY AND PROSPECTING FOR HYDROCARBON RESERVES</subject></subj-group></article-categories><title-group><article-title>Геохимическая характеристика формации Йогу бассейна Термит (Республика Нигер)</article-title><trans-title-group xml:lang="en"><trans-title>Geochemical characteristics of the Yogou Formation of the Termit Basin (Niger)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абдель Кадер</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Abdel’ Kader</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Махаман Абасс Абдель Кадер — аспирант</p><p>65, Ленинский пр-т, г. Москва, 119991</p><p>тел.: +7 (925) 850-91-18</p></bio><bio xml:lang="en"><p>Mahaman Abass Abdel’ Kader — graduate student</p><p>65, bld. 1, Leninsky Ave., Moscow 119991</p><p>tel.: +7 (925) 850-91-18</p></bio><email xlink:type="simple">kadergama17@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чернова</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Chernova</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чернова Виктория Викторовна — лаборант</p><p>65, Ленинский пр-т, г. Москва, 119991</p><p>тел.: раб.: +7 (499) 507-84-32тел.: +7 (903) 315-47-38</p></bio><bio xml:lang="en"><p>Viktoriya V. Chernova — laboratory assistant</p><p>65, bld. 1, Leninsky Ave., Moscow 119991</p><p>tel.: +7 (499) 507-84-32</p><p>+7 (903) 315-47-38</p></bio><email xlink:type="simple">vikers17@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8173-2059</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Милосердова</surname><given-names>Л. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Miloserdova</surname><given-names>L. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Милосердова Людмила Вадимовна — кандидат геолого-минералогических наук, доцент</p><p>65, Ленинский пр-т, г. Москва, 119991</p><p>тел.: раб.: +7 (499) 507-84-32тел.: +7 (926) 216-77-96</p></bio><bio xml:lang="en"><p>Lyudmila V. Miloserdova — Cand. Sci. (Geol.-Mineral.), docent</p><p>65, bld. 1, Leninsky Ave., Moscow 119991</p></bio><email xlink:type="simple">miloserdova.l@gubkin.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГАОУ ВО «Российский государственный университет нефти и газа (национальный исследовательский университет) имени И.М. Губкина»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National University of Oil and Gas “Gubkin University”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>01</day><month>01</month><year>2026</year></pub-date><volume>67</volume><issue>4</issue><fpage>39</fpage><lpage>48</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Абдель Кадер М.А., Чернова В.В., Милосердова Л.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Абдель Кадер М.А., Чернова В.В., Милосердова Л.В.</copyright-holder><copyright-holder xml:lang="en">Abdel’ Kader M.A., Chernova V.V., Miloserdova L.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.geology-mgri.ru/jour/article/view/1228">https://www.geology-mgri.ru/jour/article/view/1228</self-uri><abstract><sec><title>Введение</title><p>Введение. Нигер имеет историю разведки месторождений углеводородов с 1970-х годов. Однако добыча нефти началась лишь в 2011 году с открытия нефтяного месторождения Агадем. Сегодня территория является недооцененной с точки зрения имеющихся углеводородных ресурсов. В связи с этим является актуальным изучение территории на нефтегазоносность с помощью современных комплексных геолого-геофизических методов и исследований. Для этого нужно установить наличие и изучить имеющиеся углеводородные системы в регионе, включающие материнские толщи, породы-коллекторы, флюидоупоры, ловушки, и как эти элементы связаны между собой. В рамках представленной работы изучались материнские породы бассейна Термит в Республике Нигер. Данный регион представляет значительный интерес в связи с перспективной оценкой нефтегазоносности формации Йогу.</p></sec><sec><title>Цель</title><p>Цель. С целью изучения геохимических характеристик формации Йогу необходимо интерпретировать результаты исследований, полученные с помощью метода Rock-Eval, петрографических и биомаркерных изысканий. Установить источник для органического вещества аргиллитов формации Йогу. Указать на преимущественный фазовый состав генерируемых аргиллитами углеводородов формации Йогу. Материалы и методы. Объектом исследований в данной работе были образцы горных пород, представленные аргиллитами формации Йогу, из девяти скважин, расположенных в блоке Ага- дем бассейна Термит. В статье проведен обзор результатов пиролитических, петрографических и биомаркерных исследований материнских пород формации Йогу, привлеченных из фондовых материалов, опубликованных работ и отчетов, собранных в Министерстве нефти Республики Нигер.</p></sec><sec><title>Результаты</title><p>Результаты. Для геохимической характеристики пород формации Йогу были проведены петрографический анализ, биомаркерный анализ и пиролитические исследования с помощью метода Rock-Eval. Петрографический анализ был выполнен Китайской национальной корпорацией для Министерства нефти Республики Нигер. Петрографический анализ показал, что в материнских породах формации Йогу присутствуют мацералы групп витринита, инертинита и липтинита. Во всех исследованных образцах не было идентифицировано сапропелита (биту- минита). А анализ содержания биомаркеров в экстрагированных образцах формации Йогу показал, что в экстрактах присутствуют стераны C27—C28—C29 с преобладанием стеранов C29 над обычными стеранами C27 и C28. Дополнительно были проведены исследования методом Rock-Eval. Значения исходного водородного индекса показали, что преобладающим источником для органического вещества была высшая растительность.</p></sec><sec><title>Заключение</title><p>Заключение. Все проведенные анализы привели к одному и тому же выводу: исходным источником для органического вещества пород формации Йогу преимущественно являлась высшая наземная растительность, следовательно, материнские породы будут генерировать в большем объеме газообразные углеводороды.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. Hydrocarbon deposits in Niger have been actively explored since the 1970s. However, oil production only commenced in 2011 with the discovery of the Agadem oil field. The available hydrocarbon resources of this region are currently underestimated; thus, it is relevant to forecast the territory for oil and gas content using modern integrated geological and geophysical methods and studies. To that end, the available hydrocarbon systems in the region, including source rock formations, reservoir rocks, sealing rock, reservoir traps should be determined. Additionally, the way these elements are related to each other should be studied. This article examines the source rock formations of the Termit Basin in the Republic of Niger. The region is of considerable interest due to the oil and gas prospects of the Yogou Formation.</p></sec><sec><title>Aim</title><p>Aim. To examine the geochemical characteristics of the Yogou Formation through identifying the organic matter source of the Yogou Formation mudstones, as well as specifying the predominant phase composition of hydrocarbons generated by mudstones of the Yogou Formation.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Samples of the Yogou Formation mudstones from nine wells located in the Agadem Block of the Termit Basin were used. The results of pyrolytic, petrographic, and biomarker studies of the Yogou Formation source rock kerogen obtained from stock materials, published pa- pers, and reports provided by the Ministry of Petroleum Resources of the Republic of Niger, were analyzed.</p></sec><sec><title>Results</title><p>Results. Petrographic analysis performed by the China National Petroleum Corporation revealed that the kerogen of the source rocks of the Yogou Formation has a maceral composition including vitrinite, inertinite, and liptinite, particularly leptodetrinite, sporinite, cutinite, and resistinite. Analysis of the biomarker content of the extracted samples of the Yogou Formation showed that C27-C28-C29 steranes are present in the extracts with a predominance of C29 steranes over the common C27 and C28 steranes. According to the initial hydrogen index values determined by Rock-Eval pyrolysis, the predominant source for organic matter was higher vegetation.</p></sec><sec><title>Conclusion</title><p>Conclusion. The organic matter of the rocks of the Yogou Formation was originally derived from higher terrestrial vegetation. Consequently, the source rocks will generate more gaseous hydro-arbons.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>кероген</kwd><kwd>материнская порода</kwd><kwd>биомаркеры</kwd><kwd>формация Йогу</kwd><kwd>бассейн Термит</kwd><kwd>Нигер</kwd><kwd>Африка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>kerogen</kwd><kwd>source rock</kwd><kwd>biomarkers</kwd><kwd>Yogou Formation</kwd><kwd>Termit Basin</kwd><kwd>Niger</kwd><kwd>Africa</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">авторы выражают благодарность Министерству нефти Республики Нигер за предоставленные материалы и консультации</funding-statement><funding-statement xml:lang="en">the authors are grateful to the Ministry of Petroleum of the Republic of Niger for providing materials and advice</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Burke K., Dessauwagie T.F.J., Whiteman A.J. 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