Stratigraphy and lithology
Article # 3_2019 submitted on 01/14/2019 displayed on website on 01/30/2019
13 p.
pdf Petrophysical study of the Zavolzh carbonate reservoir of Baleikin field (Orenburg region)
The article is devoted to the study of petrophysical features of the Zavolzh carbonate reservoirs of the Baleikin field (Orenburg region). During the development of the Zavolzh reservoir, it was observed a discrepancy between the predicted and actually operating oil-saturated reservoir thicknesses in a number of wells. From the geological point of view, this may be due to the low confidence in predicting of lithotypes distribution with good reservoir properties over the area.
The aim of the study was to find an approach to predict the lateral variability of the reservoir section, taking into account core data and well logging to clarify the causes of uneven oil-saturated reservoir thicknesses.
To solve the posed problems, a comprehensive analysis of the lithological and petrophysical features of the rocks of the Zavolzh reservoir was carried out, taking into account the results of core clusterization and well logging. The developed methodological approach allowed identifying of possible geological causes of uneven reservoir operation. Suggestions are given on how to reduce uncertainties in assessing the quality and nature of the reservoir.

Keywords: Zavolzh reservoir, reservoir lithotypes, petrophysical heterogeneity, lithological and petrophysical clustering, well logging, Baleikin field, Orenburg region.
article citation Maksimova E.N., Tugarova M.A., Stremichev E.V. Litologicheskoe obosnovanie petrofizicheskoy neodnorodnosti karbonatnykh porod-kollektorov zavolzhskogo gorizonta Baleykinskogo mestorozhdeniya (Orenburgskaya oblast') [Petrophysical study of the Zavolzh carbonate reservoir of Baleikin field (Orenburg region)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2019, vol. 14, no. 1, available at: http://www.ngtp.ru/rub/2019/3_2019.html
DOI https://doi.org/10.17353/2070-5379/3_2019
References

   Abyzbaev I.I., Syrtlanov A.Sh., Viktorov P.F., Lozin E.V. Razrabotka zalezhey s trudnoizvlekaemymi zapasami nefti Bashkortostana [Development of reservoirs with hard-to-recover oil reserves of Bashkortostan]. Ufa: Bash. izd-vo «Kitap», 1994, 180 p.
   Idrisova S.A., Tugarova M.A., Stremichev E.V., Belozerov B.V. Tsifrovoy kern. Kompleksirovanie dannykh petrograficheskikh issledovaniy karbonatnykh porod s rezul'tatami issledovaniy kerna [Digital core. Combining petrographic studies of carbonate rocks with the results of core studies.]. PRONeft'. Professional'no o nefti, PAO «GAZPROM NEFT''», 2018, no. 2, p. 36-41.
   Petersil'e V.I., Poroskun V.I., Yatsenko G.G. Metodicheskie rekomendatsii po podschetu geologicheskikh zapasov ob"emnym metodom [Guidelines for geological reserves calculating by the volumetric method.]. Moscow-Tver': VNIGNI, NPTs «Tver'geofizika», 2003, 259 p.
   Skalinski M., Playton T. Petrophysical challenges in giant carbonate Tengiz field, Republic of Kazakhstan. SPWLA Journal of Petrophysics, 2015, vol. 56, no. 6, 33 p.
   Sur A.A. Litologo-fatsial'noe stroenie karbonatnykh produktivnykh plastov zavolzhskogo gorizonta Bogolyubovskogo mestorozhdeniya Orenburgskoy oblasti [The lithofacial structure of the carbonate productive strata of the Zavolzh reservoir of the Bogolyubov field of the Orenburg region]. Prioritetnye i innovatsionnye napravleniya litologicheskikh issledovaniy: materialy 9 Ural'skogo litologicheskogo soveshchaniya. Ekaterinburg, 2012, p. 171-172.