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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