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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">geores</journal-id><journal-title-group><journal-title xml:lang="ru">Георесурсы</journal-title><trans-title-group xml:lang="en"><trans-title>Georesources</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1608-5043</issn><issn pub-type="epub">1608-5078</issn><publisher><publisher-name>Georesursy LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18599/grs.2026.2.6</article-id><article-id custom-type="elpub" pub-id-type="custom">geores-678</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>СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RESEARCH ARTICLES</subject></subj-group></article-categories><title-group><article-title>Биофации доманиковых нефтематеринских отложений Камско-Кинельской системы прогибов (Волго-Уральская нефтегазоносная провинция) на рубеже девона и карбона: особенности, скорость и сценарии осадконакопления</article-title><trans-title-group xml:lang="en"><trans-title>Biofacies of Black Shale Source Rocks from the Kama–Kinel Trough System (Volga–Ural Petroleum Province) across the Devonian–Carboniferous Boundary: Characteristics, Sedimentation Rates, and Depositional Scenarios</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>Силантьев</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Silantiev</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир Владимирович Силантьев – доктор геол.-минерал. наук, профессор, заведующий кафедрой палеонтологии и стратиграфии, Институт геологии и нефтегазовых технологий; профессор</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Vladimir V. Silantiev – Dr. Sci. (Geology and Mineralogy), Professor, Head of Department of Palaeontology and Stratigraphy, Institute of Geology and Petroleum Technology; Professor</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">Vladimir.Silantiev@kpfu.ru</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>Мифтахутдинова</surname><given-names>Д. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Miftakhutdinova</surname><given-names>D. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Динара Надировна Мифтахутдинова – кандидат геол.-минерал. наук, доцент кафедры палеонтологии и стратиграфии, Институт геологии и нефтегазовых технологий; доцент</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Dinara N. Miftakhutdinova – Cand. Sci. (Geology and Mineralogy), Associate Professor of Department of Palaeontology and Stratigraphy, Institute of Geology and Petroleum Technology; Associate Professor</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">Dinara.Miftakhutdinova@kpfu.ru</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>Сунгатуллина</surname><given-names>Г. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Sungatullina</surname><given-names>G. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гузаль Марсовна Сунгатуллина – кандидат геол.-минерал. наук, доцент кафедры палеонтологии и стратиграфии, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Guzal M. Sungatullina – Cand. Sci. (Geology and Mineralogy), Associate Professor of Department of Palaeontology and Stratigraphy, Institute of Geology and Petroleum Technology</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">Guzel.Sungatullina@kpfu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сафаров</surname><given-names>А. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Safarov</surname><given-names>А. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Альберт Феликсович Сафаров – кандидат геол.-минерал. наук, начальник управления геологоразведочных работ</p><p>423462, Альметьевск, ул. Советская, д. 186а</p></bio><bio xml:lang="en"><p>Albert F. Safarov – Cand. Sci. (Geology and Mineralogy), Head of the Geological Exploration Management</p><p>186a, Sovetskaya st., Almetyevsk, 423462</p></bio><email xlink:type="simple">safarovaf@tatneft.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Валидов</surname><given-names>М. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Validov</surname><given-names>M. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Марат Фанисович Валидов – кандидат геол.-минерал. наук, старший научный сотрудник, Институт геологии и нефтегазовых технологий</p><p>420008, г. Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Marat F. Validov – Cand. Sci. (Geology and Mineralogy), Senior Researcher, Institute of Geology and Petroleum Technology</p><p>18 Kremlevskaya St., Kazan, 420008</p></bio><email xlink:type="simple">marat.validov@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ганиев</surname><given-names>Б. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Ganiev</surname><given-names>B. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Булат Галиевич Ганиев – кандидат тех. наук, начальник Департамента разработки месторождений</p><p>423450, Альметьевск, ул. Ленина, д. 75</p></bio><bio xml:lang="en"><p>Bulat G. Ganiev – Cand. Sci. (Technical), Head of the Field Development Department</p><p>75, Lenina st., Almetyevsk, 423450</p></bio><email xlink:type="simple">GanievBG@tatneft.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лутфуллин</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Lutfullin</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Азат Абузарович Лутфуллин – кандидат тех. наук, заместитель начальника Департамента разработки месторождений</p><p>423450, Альметьевск, ул. Ленина, д. 75</p></bio><bio xml:lang="en"><p>Azat A. Lutfullin – Cand. Sci. (Tech.), Deputy Head of the Field Development Department, Tatneft-Mining</p><p>75, Lenina st., Almetyevsk, 423450</p></bio><email xlink:type="simple">LutfullinAA@tatneft.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шуматбаев</surname><given-names>К. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Shumatbaev</surname><given-names>K. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кирилл Дмитриевич Шуматбаев – кандидат геол.-минерал. наук, главный эксперт по петрофизическим исследованиям</p><p>423450, Альметьевск, ул. Ленина, д. 75</p></bio><bio xml:lang="en"><p>Kirill D. Shumatbaev – Cand. Sci. (Geology and Mineralogy), Chief Expert in Petrophysical Research, Tatneft-Mining</p><p>75, Lenina st., Almetyevsk, 423450</p></bio><email xlink:type="simple">Shumatbaevkd@tatneft.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хабипов</surname><given-names>Р. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Khabipov</surname><given-names>R. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ришат Минехарисович Хабипов – начальник отдела мониторинга разработки месторождений и недропользования</p><p>423450, Альметьевск, ул. Ленина, д. 75</p></bio><bio xml:lang="en"><p>Rishat M. Khabipov – Head of the Department of Field Development and Subsoil Use Monitoring, Tatneft-Mining</p><p>75, Lenina st., Almetyevsk, 423450</p></bio><email xlink:type="simple">HabipovRM@tatneft.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Базаревская</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Bazarevskaya</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Венера Гильмеахметовна Базаревская – кандидат геол.-минерал. наук, заместитель директора по научной работе в области геологии трудноизвлекаемых запасов</p><p>423462, Альметьевск, ул. Советская, д. 186а</p></bio><bio xml:lang="en"><p>Venera G. Bazarevskaya – Cand. Sci. (Geology andMineralogy), Deputy Director for Research in the Field of Hard-to-Recover Oil Reserves</p><p>186a, Sovetskaya st., Almetyevsk, 423462</p></bio><email xlink:type="simple">bazarevskaya@tatnipi.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Судаков</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sudakov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владислав Анатольевич Судаков – заместитель директора по маркетингу, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Чернышевского, д. 7</p></bio><bio xml:lang="en"><p>Vladislav A. Sudakov – Deputy Director for Marketing, Institute of Geology and Petroleum Technology</p><p>7, Chernyshevsky st., Kazan, 420008</p></bio><email xlink:type="simple">VlASudakov@kpfu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Нургалиева</surname><given-names>Н. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Nourgalieva</surname><given-names>N. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Нурия Гавазовна Нургалиева – доктор геол.-минерал. наук, профессор кафедры геологии нефти и газа имени акад. А.А.Трофимука, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Nuriya G. Nourgalieva – Dr. Sci. (Geology and Mineralogy), Professor, Department of Oil and Gas Geology, Institute of Geology and Petroleum Technology</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">nouria.nourgalieva@kpfu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дуглав</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Duglav</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юлия Александровна Дуглав – научный сотрудник, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Yulia A. Duglav – Researcher, Institute of Geology and Petroleum Technology</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">julianad@inbox.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вандин</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Vandin</surname><given-names>А. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Артем Сергеевич Вандин – студент, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Artem S. Vandin – student, Institute of Geology and Petroleum Technology</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">vandin20004@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Драздова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Drazdova</surname><given-names>А. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анна Владимировна Драздова – младший научный сотрудник, Лаборатория седиментологии и геохимии осадочных бассейнов</p><p>119017, Москва, Пыжевский пер., д. 7</p></bio><bio xml:lang="en"><p>Anna V. Drazdova – Junior Researcher, Laboratory of Sedimentology and Geochemistry of Sedimentary Basins</p><p>7, Pyzhevsky per., Moscow, 119017</p></bio><email xlink:type="simple">annadrazd@gmail.com</email><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Королев</surname><given-names>Э. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Korolev</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Эдуард Анатольевич Королев – кандидат геол.-минерал. наук, доцент кафедры общей геологии и гидрогеологии, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Eduard A. Korolev – Cand. Sci. (Geology and Mineralogy), Associate Professor of Department of General Geology and Hydrogeology, Institute of Geology and Petroleum Technology</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">Edik.Korolev@kpfu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рогов</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Rogov</surname><given-names>А. М.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алексей Михайлович Рогов – инженер, Институт геологии и нефтегазовых технологий</p><p>420008, Казань, ул. Кремлевская, д. 18</p></bio><bio xml:lang="en"><p>Alexey M. Rogov – Engineer, Institute of Geology and Petroleum Technology</p><p>18, Kremlevskaya st., Kazan, 420008</p></bio><email xlink:type="simple">Aleksej.Rogov@kpfu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калимуллин</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalimullin</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алмаз Маратович Калимуллин – начальник отдела геологоразведочных работ</p><p>423462, Альметьевск, ул. Советская, д. 186а</p></bio><bio xml:lang="en"><p>Almaz M. Kalimullin – Head of the Geological Exploration Department</p><p>186a, Sovetskaya st., Almetyevsk, 423462</p></bio><email xlink:type="simple">KalimullinAlmazM@tatnipi.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ибайдуллаев</surname><given-names>Т. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Ibaydullaev</surname><given-names>T. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Темур Гайбуллаевич Ибайдуллаев – PhD, заместитель исполнительного директора по науке и инновациям</p><p>Республика Узбекистан, Джизак, ул. Ш. Рашидова, д. 295</p></bio><bio xml:lang="en"><p>Temur G. Ibaydullaev – PhD, Deputy Executive Director for Science and Innovation</p><p>295, Sharof Rashidov, Jizzakh, Republic of Uzbekistan</p></bio><email xlink:type="simple">TGIbaydullaev@kpfu.ru</email><xref ref-type="aff" rid="aff-6"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Казанский (Приволжский) федеральный университет; Филиал Казанского (Приволжского) федерального университета в городе Джизаке</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University; Branch of Kazan Federal University in Jizzak</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Казанский (Приволжский) федеральный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kazan Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Институт «ТатНИПИнефть» ПАО «Татнефть»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>TatNIPIneft Institute Tatneft PJSC</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Татнефть-Добыча ПАО «Татнефть»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tatneft PJSC</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru"><institution>Геологический институт РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Geological Institute of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-6"><aff xml:lang="ru"><institution>Филиал Казанского (Приволжского) федерального университета в городе Джизаке</institution><country>Узбекистан</country></aff><aff xml:lang="en"><institution>Branch of Kazan Federal University in Jizzak</institution><country>Uzbekistan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>23</day><month>06</month><year>2026</year></pub-date><volume>28</volume><issue>2</issue><fpage>59</fpage><lpage>90</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Силантьев В.В., Мифтахутдинова Д.Н., Сунгатуллина Г.М., Сафаров А.Ф., Валидов М.Ф., Ганиев Б.Г., Лутфуллин А.А., Шуматбаев К.Д., Хабипов Р.М., Базаревская В.Г., Судаков В.А., Нургалиева Н.Г., Дуглав Ю.А., Вандин А.С., Драздова А.В., Королев Э.А., Рогов А.М., Калимуллин А.М., Ибайдуллаев Т.Г., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Силантьев В.В., Мифтахутдинова Д.Н., Сунгатуллина Г.М., Сафаров А.Ф., Валидов М.Ф., Ганиев Б.Г., Лутфуллин А.А., Шуматбаев К.Д., Хабипов Р.М., Базаревская В.Г., Судаков В.А., Нургалиева Н.Г., Дуглав Ю.А., Вандин А.С., Драздова А.В., Королев Э.А., Рогов А.М., Калимуллин А.М., Ибайдуллаев Т.Г.</copyright-holder><copyright-holder xml:lang="en">Silantiev V.V., Miftakhutdinova D.N., Sungatullina G.M., Safarov А.F., Validov M.F., Ganiev B.G., Lutfullin A.A., Shumatbaev K.D., Khabipov R.M., Bazarevskaya V.G., Sudakov V.A., Nourgalieva N.G., Duglav Y.A., Vandin А.S., Drazdova А.V., Korolev E.A., Rogov А.М., Kalimullin A.M., Ibaydullaev T.G.</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.geors.ru/jour/article/view/678">https://www.geors.ru/jour/article/view/678</self-uri><abstract><p>Проведено комплексное исследование пограничных девонско-каменноугольных отложений с высоким содержанием органического вещества, образовавшихся в осевых и бортовых зонах Камско-Кинельской системы прогибов. Изучение конодонтов позволило выделить в верхней части фаменского яруса зону expansa, в нижней части турне - зоны duplicata и quadruplicata. Установлено, описано и проиллюстрировано шесть биофаций, характеризующих бескислородные, слабокислородные и относительно кислородные обстановки. Отложения разных биофаций отличаются друг от друга содержанием органического вещества, количеством и разнообразием скелетных остатков ископаемых организмов, особенностями микробиальных построек, текстурами и ихнотекстурами пород. Изученные геологические разрезы характеризуются частым, от первых метров до первых сантиметров, чередованием различных биофаций. Наиболее тонкое чередование биофаций зафиксировано на склоне прогиба. Предложены схемы осадконакопления для разных условий состояния бассейна: для бассейна с бескислородной обстановкой и сероводородным заражением; для бассейна с водным столбом, разделенным на кислородную и бескислородную оболочки, и для бассейна с относительно высоким содержанием кислорода по всей толщине водного столба.</p></abstract><trans-abstract xml:lang="en"><p>Organic-rich Devonian–Carboniferous deposits from the axial and marginal zones of the Kama–Kinel Trough System were investigated. Conodont data place the upper Famennian interval in the expansa Zone and the lower Tournaisian interval in the duplicata and quadruplicata Zones. Six biofacies were identified, described and illustrated, representing anoxic, dysoxic and relatively oxygenated settings. These biofacies differ in organic-matter content, the abundance and diversity of skeletal remains, the character of microbial buildups, and rock textures, including ichnotextures. The studied sections show frequent alternations of biofacies, from metre-scale to centimetre-scale intervals, with the finest alternation recorded on the trough slope. Three depositional scenarios are proposed, corresponding to three basin states: a fully anoxic basin affected by hydrogen sulphide, a stratified basin with separate oxic and anoxic water layers, and a basin with relatively high oxygen content throughout the water column.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Волго-Уральская нефтегазоносная провинция</kwd><kwd>Камско-Кинельская система прогибов</kwd><kwd>доманиковые фации</kwd><kwd>граница девона и карбона</kwd><kwd>модель осадконакопления</kwd><kwd>биофации</kwd><kwd>конодонты</kwd><kwd>бескислородные обстановки</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Volga–Ural Petroleum Province</kwd><kwd>Kama–Kinel Trough System</kwd><kwd>Domanik facies</kwd><kwd>biofacies</kwd><kwd>Devonian–Carboniferous boundary</kwd><kwd>depositional model</kwd><kwd>conodonts</kwd><kwd>anoxic settings</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Мы благодарим компанию ПАО «Татнефть» за предоставленные данные и разрешение на их использование в данной публикации. Биофациальные исследования Д.Н.Мифтахутдиновой выполнены частично за счет средств субсидии, выделенной Казанскому федеральному университету для выполнения государственного задания проект № FZSM-2023-0023 в сфере научной деятельности.</funding-statement><funding-statement xml:lang="en">The authors thank PJSC Tatneft for providing the data and granting permission to use them in this publication. Biofacies studies by D.N. Miftakhutdinova were partially funded by the subsidy allocated to Kazan Federal University for the state assignment project № FZSM-2023-0023 in the sphere of scientific activities.</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">Аверьянов В.И. (1960). Условия образования сарайлинской толщи Татарии. Геология нефти, 2, с. 25–28.</mixed-citation><mixed-citation xml:lang="en">Afanasieva M.S., Kononova L.I., Zaytseva E.L., Baranova A.V. 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