Ul'nyrov I.L.

ulnyrov_iv@mail.ru

Graduated from the State University (2017), specialization "geologist".
Junior Researcher of the Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, Syktyvkar.
Area of scientific interests: geology of oil and gas, lithology, carbonate rocks, reservoir rocks.
Author of 12 publications.
Stratigraphy and lithology
Article # 15_2024 submitted on 04/10/2024 displayed on website on 05/29/2024
21 p.
pdf The characteristics of boundary strata of the pre-Greben regional unconformity from Upper Silurian of the Chernov Swell (Sizimselebeyshor creek) according to the conodonts chronostatigraphy
Upper Silurian conodonts from the outcrop of the Sizimselebeishor Creek were studied for the first time. A sequence of four associations conodonts of different taxonomic structure has been established throughout the boundary of the pre-Greben regional unconformity in the Sizimselebeyshor Creek. Association 1 with the dominant regional species Ctenognathodus (?) sp. A is dated below the surface of the unconformity. Association 2 with Ozarkodina confluence (Branson et Mehl, 1933), Oz. cornidentata Viira, 1983 and Coryssognathus dubius (Rhodes, 1953) was fixed in section, which directly underlying the unconformity. Association 3 with Panderodus equicostatus (Rhodes, 1953) and Wurmiella excavata (Branson et Mehl, 1933) was established directly overlapping the discordance. Both borderland associations 2 and 3 are represented by species of wide geographical and long-term stratigraphic distribution. Association 4 with species Zieglerodina cf. ivochlupaci Carls, Slavik, Valenzuella-Rios, 2007 and Oz. denticulata Viira, 2000 Pridoly age is dated above the pre-Greben unconformity also.
An auxiliary biostratigraphic division - layers with Ctenognathodus (?) sp. A of Gerdyu time (Ludlow) was identified as a result of correlation the studied interval with the boundary strata of Gerdyu regional stage (Ludlow) and Greben regional stage (Pridoli) of the reference section of the Kozhym River of the western slope of the Subpolar Urals. The layers are characterized by the joint presence of conodonts Ctenognathodus (?) sp. A and Ozarkodina confluens (Branson et Mehl, 1933), zonal brachiopod species Didymothiris didyma (Dalman, 1828) and the development of stromatolites interlayers.

Keywords: conodonts, Upper Silurian, Gerdyu regional stage, Greben regional stage, pre-Greben regional unconformity, Sizimselebeyshor Creek, Chernov Swell.
article citation Sokolova L.V., Dan'shchikova I.I., Ul'nyrov I.L. Kharakteristika po konodontam pogranichnykh otlozheniy predgrebenskogo nesoglasiya v verkhnem silure podnyatiya Chernova (ruchey Sizimtselebeyshor) [The characteristics of boundary strata of the pre-Greben regional unconformity from Upper Silurian of the Chernov Swell (Sizimselebeyshor creek) according to the conodonts chronostatigraphy]. Neftegazovaya Geologiya. Teoriya I Praktika, 2024, vol. 19, no. 2, available at: https://www.ngtp.ru/rub/2024/15_2024.html EDN: UJJBXO
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Stratigraphy and lithology
Article # 26_2023 submitted on 05/19/2023 displayed on website on 08/01/2023
36 p.
pdf Sedimentation conditions, petrography and formation of reservoir rocks of the Upper Silurian Carbonate strata of the Cherpayu area on the Gamburtsev Swell (Timan-Pechora petroleum province)
This article presents the results of studies of poorly investigated Upper Silurian carbonate strata of the Gamburtsev Swell using the Cherpayu area as an example. Methods of lithofacies analysis, scanning electron microscopy, data of petrophysical and geophysical studies of wells were used. In the Upper Silurian strata, nine microfacies types have been identified that characterize four facies’ zones: 1) littoral and flooded coast, 2) shelf lagoon, 3) shallow-water shelf zone, and 4) shallow sublittoral open shelf environments. Reconstruction of Late Silurian sedimentation showed that sediments accumulation in the Ludlowian time occurred mainly in the accumulative silty littoral conditions, and in the Pridolian time, in the conditions of the shallows on the open sea basin, where carbonate sands and small bioherms accumulated.
Five petrotypes of reservoir rocks have been identified, differing in structural (crystal size) and petrophysical (porosity and permeability) properties. The best properties of porosity and permeability are found in dolomites with a grain size of 20-100 µm, with a shady microbial clot structure, which is characteristic of “algae laminites” (petrotypes 1 and 2). Voidness is cavity-porous-fracture with a predominance of secondary leaching voids. A successive series of important stages in the reservoirs formation of the Upper Silurian in the Cherpayu area of the Gamburtsev Swell was identified: 1) the stage of sedimentation and diagenesis, which ensured primary voidness; 2) the stage of the Middle Devonian structural transformation and the regional pre-Upper Devonian hiatus, which is associated with the formation of surface (epigene) karst, which is not currently functioning, and 3) the stages of the Ural and Pay-Khoy tectonic phases, which ensured the activation of ascending fluid flows and the development of localized and diffusely manifested porosity deep hypogene karst.

Keywords: Carbonate Upper Silurian sedimentation, formation reservoir rocks, Cherpayu area, Gamburtsev Swell, Timan-Pechora petroleum province.
article citation Ul'nyrov I.L., Maydl' T.V. Litologiya, usloviya osadkonakopleniya i formirovanie porod-kollektorov verkhnesiluriyskikh karbonatnykh otlozheniy vala Gamburtseva (Timano-Pechorskaya neftegazonosnaya provintsiya) [Sedimentation conditions, petrography and formation of reservoir rocks of the Upper Silurian Carbonate strata of the Cherpayu area on the Gamburtsev Swell (Timan-Pechora petroleum province)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2023, vol. 18, no. 3, available at: http://www.ngtp.ru/rub/2023/26_2023.html EDN: ZQRFWL
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