M.A. Rogov, V.A. Zakharov, A.P. Ippolitov, O.A. Lutikov, D.N. Kiselev, N.G. Zverkov, I.V. Panchenko
Mollusс-based detailed biostratigraphy of Middle Jurassic-Lower Cretaceous formations in Zaozyornaya-1 well, Western Siberia
DOI 10.47148/0016-7894-2025-6-77-99
Key words: Southern Urals; frontal folds; seismic stratigraphy sequences; oil and gas bearing sequences; unconventional reservoir; local exploration targets; oil; gas.
For citation: Rogov M.A., Zakharov V.A., Ippolitov A.P., Lutikov O.A., Kiselev D.N., Zverkov N.G., Panchenko I.V. Mollusс-based detailed biostratigraphy of Middle Jurassic-Lower Cretaceous formations in Zaozyornaya-1 well, Western Siberia. Geologiya nefti i gaza. 2025;(6):77–99. DOI: 10.47148/0016-7894-2025-6-77-99. In Russ.
Acknowledgments: The materials for this study were obtained under the State Assignment to VNIGNI FSBU “Drilling a stratigraphic well in the Zaozyorny area, Khanty-Mansi Autonomous Okrug – Yugra. Target depth 3000 m” (2020–2022) funded by the Federal Agency for Mineral Resources (Rosnedra). The paper was prepared on the topic of the State Assignment to Geological Institute of the Russian Academy of Sciences (topic No. FMMG-2021-0003) and Kazan Federal University (topic No. FZSM-2023-0023). The authors are grateful to the reviewers for their comments on the manuscript and to G.A. Kalmykov for providing a specimen of ammonite from 8223 Well.
Callovian – Lower Valanginian deposits (Abalak – Lower Akhsky formations) in the Zaozyornaya-1 stratigraphic well are completely represented by core (total length exceeds 165 m). There are numerous fossil records (mainly mollusсs) throughout almost the entire interval, which allows reliable dating formations, subformations, and members, as well as more precise defining the depositional environments. Based on ammonites, the studied section is subdivided into substages and zones in the most detail. The most significant finds include Upper Callovian Kosmoceras, which had been poorly studied in Western Siberia, and Upper Kimmeridgian “Sarmatisphinctes”, being reported for the first time outside the Subpolar Urals. Finds of Kosmoceras have allowed, for the first time in Western Siberia, the revealing of Sub-Boreal stratigraphic units in the Callovian stage. For the basal part of the Lower Tutleimsky Member, an Early Volgian age has been proved for the first time, based on Virgatosphinctoides and Paravirgatites finds. In addition to Boreal ammonites, a fragment of Neocomitidae ammonite was found in the Lower Valanginian deposits. Among the bivalve mollusсs, the most stratigraphically important are finds of the Meleagrinella and Buchia genera, as well as inoceramids. Belemnite rostra are frequent in the Abalak Fm, where they allow substantiating the age of Callovian-Kimmeridgian interval of the section. In the Tutleimsky Fm, belemnite rostra are very rare, however, onychites, including megaonychites are frequent, which occur up to the upper Ryazanian Stage. A unique discovery of ichthyosaur bones has also been made near the Ryazanian Top. Taking into account the ammonite occurrence patterns, one can suppose that at the end of the Callovian the West Siberian Basin was connected to the basins located to the south and west via the Turgai Strait. Integrated paleontological, lithological, and well logging characteristics and full core recovery in the Abalak – Tutleimsky formations allow considering this interval as a reference one and recommending to identify neostratotypes of these formations in it.
Mikhail A. Rogov ORCiD Scopus
Doctor of Geological and Mineralogical Sciences,
Professor
Geological Institute of Russian Academy of Sciences,
7, Pyzhevskiy per., Moscow, 119017, Russia
e-mail: rogov@ginras.ru
Viktor A. Zakharov
Doctor of Geological and Mineralogical Sciences,
Professor
Geological Institute
of Russian Academy of Sciences,
7, Pyzhevskiy per., Moscow, 119017, Russia
e-mail: mzarctic@gmail.com
Aleksei P. Ippolitov ORCiD
Geological Institute of Russian Academy of Sciences,
7, Pyzhevskiy per., Moscow, 119017, Russia
e-mail: ippolitov.ap@gmail.com
SPIN: 7126-8585
Oleg A. Lutikov ORCiD
Candidate of Geological and Mineralogical Sciences,
Geological Institute of Russian Academy of Sciences
7, Pyzhevskiy per., Moscow, 119017, Russia
e-mail: niipss@mail.ru
SPIN: 9418-2224
Dmitrii N. Kiselev ORCiD
Doctor of Geological and Mineralogical Sciences,
Aprelevka branch of the
All-Russian Scientific-Research
Geological Oil Institute (VNIGNI),
1st Ketritsa ul., Aprelevka, 143360, Russia
e-mail: dnkiselev@mail.ru
SPIN: 7314-9920
Nikolai G. Zver’kov ORCiD
Candidate of Geological and Mineralogical Sciences,
Geological Institute of Russian Academy of Sciences
7, Pyzhevskiy per., Moscow, 119017, Russia
e-mail: zverkovnik@mail.ru
SPIN: 9657-4712
Ivan V. Panchenko ORCiD
Candidate of Geological and Mineralogical Sciences,
CJSC MiMGO,
21, Shosse Entuziastov, Moscow, 111123, Russia
e-mail: ivpanchenko89@gmail.com
SPIN: 8925-2324
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