In modern practice the allocation of reservoirs within productive formations is usually carried out using boundary values of porosity, permeability and oil saturation determined by the results of core research. At the same time back in the 80s V.D. Ilyin and other researchers proposed a model of the three-layer structure of natural reservoirs, which implies, that hydrocarbon deposits consist of reservoirs, «true» fluid seals and «false» ones (formations of dispersion). The object of the study is an oil field located in the northeastern part of the Timan-Pechora oil and gas province. The productive section of the studied field is represented by two layers: the lower one is located in the deposits of the Gzhelsky tier of the Upper Carboniferous, the upper one is in the deposits of the Asselsky tier of the Lower Permian. The basis for the study was a complex of geological and geophysical studies of 30 wells, the results of laboratory core studies of 6 wells, the results of well tests, as well as reservoir pressure measurements based on hydrodynamic logging data in 2 wells. This article presents the results confirming the possibility of a three-layer structure of natural reservoirs in carbonate rocks, a method for allocation fluid seals and formations of dispersion according to a complex of geological and geophysical studies and the results of laboratory core analysis, as well as substantiation of the allocating fluid seal. The materials for this publication were prepared in collaboration with Oil and Gas Research Institute of RAS.
References
1. Zhuravlev V.A., Korago E.A., Kostin D.A. et al., Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:1 000 000 (State geological map of the Russian Federation. Scale 1: 1,000,000), Seriya Severo-Karsko-Barentsevomorskaya. List R-39,40 – o. Kolguev – proliv Karskie Vorota. Ob"yasnitel'naya zapiska (Series North-Kara-Barents Sea. Sheet R-39.40 - Kolguev Island - Kara Gate. Explanatory letter), St. Petersburg: Publ. of Kartograficheskaya fabrika VSEGEI, 2014, 405 p.
2. Shaburova M.E., Orlov N.N., Allocation of improved filtration and reservoir properties zones using the example of an oil field in the Timan-Pechora oil and gas province (In Russ.), Ekspozitsiya Neft' Gaz, 2024, no. 4, pp. 16–21,
DOI: https://doi.org/10.24412/2076-6785-2024-4-16-21
3. Sotnikova A.G., Oil and gas accumulation zones and the priority directions of renewal of oil reserves in the carbonate complexes, Varandey-Adzvinsky aulacogen (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2010, no. 5,
URL: http://www.ngtp.ru/rub/6/4_2010.pdf
4. Suvorova E.B., Lithology and sedimentary environments of the Upper Visean - Lower Permian strata of the Pechora offshore (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2012, V. 7, no. 2,
URL: http://www.ngtp.ru/rub/2/25_2012.pdf
5. Metodicheskie rekomendatsii po podschetu zapasov nefti i gaza ob’emnym metodom. Otsenka kharaktera nasyshchennosti po dannym GIS (Guidelines for the calculation of reserves of oil and gas by volumetric method. Assessment of the nature of saturation according to well logging): edited by Petersil’e V.I., Poroskun V.I.,
Yatsenko G.G., Moscow – Tver: Publ. of VNIGNI, 2003, 258 p.
6. Il'in V.D. et al., Lokal'nyy prognoz neftegazonosnosti na osnove analiza stroeniya lovushek v trekhsloynom rezervuare: Metodicheskie rekomendatsii (Local forecast of oil and gas potential based on the analysis of the structure of traps in a three-layer reservoir: Methodological recommendations), Moscow: Publ. of VNIGNI, 1982, 52 p.
7. Il'in V.D. et al., Prognoz neftegazonosnosti lokal'nykh ob"ektov na osnove vyyavleniya lovushek v trekhchlennom rezervuare: Metodicheskie ukazaniya (Forecast of oil and gas potential of local objects based on detection of traps in a three-member reservoir: Methodological guidelines), Moscow: Publ. of VNIGNI, 1986, 68 p.
8. Larskaya E.S. et al., Regional'nyy i lokal'nyy prognoz neftegazonosnosti (Regional and local forecast of oil and gas potential), Moscow: Nedra Publ., 1987, 237 p.
9. Khitrov A.M, Il'in V.D., Savinkin P.T., Vydelenie, kartirovanie i prognoz neftegazonosnosti lovushek v trekhchlennom rezervuare: Metodicheskoe rukovodstvo (Identification, mapping and forecasting of oil and gas potential of traps in a three-member reservoir: Methodological guide), Moscow: Publ. of VNIGNI, 2002, 36 p.
10. Khitrov A.M., Danilova E.M., Konovalova I.N., Popova M.N., Geological exploration risks of near-fault hydrocarbon deposits (In Russ.), Problemy ekonomiki i upravleniya neftegazovym kompleksom, 2023, no. 4, pp. 20–32,
