The Achimov reservoirs in the north of West Siberia have complex geological structure, together with abnormal mobile water zones associated with dome uplifts and are accompanied by variability of reservoir water salinity which limits the use of electrical models to solve the problem of quantifying gas saturation. In this regard, the relevance of non-standard solutions aimed at applying alternative well logging methods is increasing. The paper describes the first experience of using the spectrometric pulsed neutron gamma logging method which is a domestic AINK-PL hardware solution for quantifying the gas saturation of Achimov reservoirs. The described appliance is a product of Agreement for cooperation between Rosneft Oil Company and State Atomic Energy Corporation Rosatom (Dukhov Automatics Research Institute). The paper describes a methodological approach to the quantitative assessment of gas saturation which is applicable under the condition of penetrating the productive reservoirs on oil-base mud (OBM). The methodological approach is based on solving a system of linear algebraic equations and calculating the content of seven main rock-forming minerals and three fluids: gas, water, and OBM. The results of the study at a qualitative level are verified by the results of wireline formation tests and demonstrate a new methodological potential of the AINK PL hardware complex in terms of studies of gas-saturated deposits.
References
1. Grechneva O.M., The hypothesis of gravitational water development in Achimov formations (In Russ.), Gazovaya promyshlennost’, 2021, no. 3 (813), pp. 32–37.
2. Rodivilov D.B., Grechneva O.M., Natchuk N.Yu., Rusanov A.S., Petrophysical basis for modeling expelled water in gas saturated reservoirs of the Achimov sequence (In Russ.), Ekspozitsiya Neft’ Gaz, 2021, no. 6(85), pp. 41–45, DOI: https://doi.org/10.24412/2076-6785-2021-6-41-45
3. Rodivilov D.B., Grechneva O.M., Makhmutov I.R. et al., Petrophysical method of estimating Achimov reservoir fluid types with variable salinity of formation waters
(In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2022, no. 8, pp. 56–59, DOI: https://doi.org/10.24887/0028-2448-2022-8-56-59
4. Basyrov M.A., Mitrofanov D.A., Makhmutov I.R. et al., The development of the technique for measuring mass fractions of chemical elements using AINK-PL logs
(In Russ.), Karotazhnik, 2021, no. 8(314), pp. 121–130.
5. Rakaev I.M., Gadel’shin E.V., Khanafin I.A. et al., Developing market of domestic hi-tech well survey appliances (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2022, no. 12, pp. 78-82, DOI: https://doi.org/10.24887/0028-2448-2022-12-78-82
6. Makhmutov I.R., Rakaev I.M., Mitrofanov D.A. et al., Application of innovative instrumentation & methodic equipment complex AINK-PL for petrophysical modeling in Rosneft Oil Company (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2023, no. 2, pp. 66–71, DOI: https://doi.org/10.24887/0028-2448-2023-2-66-71
7. Rodivilov D.B., Kantemirov Yu.D., I.R. Makhmutov, A.V. Akin’shin, Prakticheskoe rukovodstvo po petrofizicheskomu modelirovaniyu neftegazonasyshchennosti (Practical guide to petrophysical modeling of oil and gas saturation), Tyumen: Ekspress Publ., 2023, 144 p.
8. Ellanskiy M.M., Petrofizicheskie osnovy
