Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering
The journal «Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering» is a peer-reviewed journal, published since 1903. Founder and publisher: Tomsk Polytechnic University. Publishing house address: room 139 b, 30, Lenin avenue, Tomsk, Tomsk region, 634050. Telephone number: (3822) 60-62-91 E-mail: izv@tpu.ru Publication frequency: monthly The journal is registered by the RF Ministry of Press, Broadcasting and Mass Communications (Certificate PE no. FM 77-65008, March 04, 2016). ISSN (print) – 2500-1019 ISSN (on-line) – 2413-1830 Coverage: Russian Federation, foreign countries. Publication languages: Russian, English. Subscription index in the unit catalogue «Russian Press» – 18054 The journal «Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering» presents original papers, review papers, rapid communications and discussions covering recent advances in geology, exploration and extraction of mineral resources, transportation technologies and deep processing of natural resources, energy-efficient production and energy conversion based on mineral resources as well as on safe disposal of geo assets. The journal will be of interest to geologists, chemists, engineers, physicists, ecologists, power engineers, specialists in storage and transportation of energy resources, IT specialists as well as other specialists in the related fields. Topic areas of the journal «Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering»: • Geo Assets Exploration and Refining; • Geo Assets Mining and Transportation; • Geo Assets Deep Processing; • Energy-efficient Production and Conversion of Energy Based on Geo Assets; • Safe Disposal of Geo Assets and Geoecology Issues; • Geo-Engineering of Eurasia and Marginal Sea; • Economic and Social Aspects of Using Geo Assets. The journal publishes only original research articles in Russian and English not published before. The journal is indexed and archived in: – Scopus; – GeoRef; – Web of Science Core Collection's Emerging Sources Citation Index; – DOAJ. All articles in the journal are peer reviewed. Authors can suggest two reviewers familiar with the research focus of the article. Final decision on any paper is made by the Editor in Chief. The editorial board does not charge authors for the preparation, placement and printing of materials. There are no accelerated timing of issue date. The papers already submitted in other editions are not considered. If the fact of such submission is revealed the paper will be withdrawn by the editorial stuff.
National Research Tomsk Polytechnic University
Net pay volume probabilistic assessment approaches for lithologically screened traps using the example of Achimov deposits in the northern part of Yamalo-Nenets Autonomous District
Relevance. When conducting a probabilistic assessment of the initial geological reserves with complicated structure, such as the Achimov deposits, it is necessary to take into account a set of uncertainties related to their geological structure. Aim. Achimov deposits probabilistic assessment, taking into account a set of uncertainties related either to sedimentary bodies mapping or geophysical methods technical limitations. Methods. The article describes an integrated technique of multivariate two-dimensional modeling, which is adapted to account for uncertainties at three main stages of mapping: structural plan construction, effective volume prediction, and fluid-saturated volume prediction, using the example of a field in the Nadym district of the Yamalo-Nenets Autonomous Okrug. Results and conclusions. The proposed methodological approaches for 2D probabilistic assessment made it possible to obtain maps reflecting the main features of the geological structure, particularly, facies differentiation & lithological heterogeneity in the lateral direction. The obtained maps can be used for conducting analytical calculations for assessing development strategy in further stages of the asset assessment. For citation: Perepletkin I.A., Zaboeva A.A., Muzraeva B.Yu. Net pay volume probabilistic assessment technique for lithologically screened traps using the example of Achimov deposits in the northern part of Yamalo-Nenets Autonomous District. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 7-24. https://doi.org/10.18799/24131830/2026/6/5274
Copyright (c) 2026 Иван Алексеевич Переплеткин, Александра Александровна Забоева, Байрта Юрьевна Музраева https://creativecommons.org/licenses/by-nc/4.0
Prediction of biological activity of nitrilsilanes and nitrilsiloxanes
Relevance. The need to identify new, effective biocidal additives for motor oils that can prevent microbiological contamination and improve the operational performance of lubricants. Aim. To establish structure–function relationships and to develop predictive equations for evaluating and forecasting the antimicrobial and fungicidal activities of organoelement compounds based on nitrile silanes and nitrile siloxanes. For these purposes, indices of reactivity were obtained, including frontier orbital energies (highest occupied molecular orbital and lowest unoccupied molecular orbital), the global electrophilicity index of the studied nitrile silanes and nitrile siloxanes, and values of their biological activity in M-10 oil. Additionally, theoretical calculations and experimental data were compared with the reference compound, sodium pentachlorophenolate. Methods. Mathematical modeling, statistical methods, computational experiment, and the hybrid B3LYP method with the 6-31+G(d,p) basis set were employed. The antimicrobial properties of the compounds were investigated using the agar well diffusion method. Results and conclusions. It was shown that organoelement compounds are capable of exhibiting biological activity and can be recommended as biocidal additives. To evaluate the combined effect of all the studied factors on the inhibition zone of microorganism growth, graphical dependencies of the inhibition zones (for a mixture of bacteria and fungi) on the concentrations of the tested organoelement compounds are presented. The factors analyzed include: x1 – difference in energies of frontier orbitals; x2 – mass concentration; x3 – Si–C bond length; x4 – dipole moment; x5 – electrophilicity index. The interpretation of the resulting model (diameter, Y) indicated that factor x1 has the greatest effect on it. Factor x5, with double and triple interactions among various factors also contributing to the response are following in impact. Based on the simulation results, the values of the equation coefficients revealed common and distinctive features in the two models (bactericidal and fungicidal) of the microorganism suppression zone. For citation: Loginova M.E., Kolchina G.Yu., Guseynova S.N., Movsum-zade N.Ch. Babaev, E.R., Movsumzade E.M. Prediction of biological activity of nitrilsilanes and nitrilsiloxanes. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 25-34. https://doi.org/10.18799/24131830/2026/6/5181
Copyright (c) 2026 Марианна Евгеньевна Логинова, Галина Юрьевна Колчина, Саадет Назим кызы Гусейнова, Назрин Чингизовна Мовсум-заде, Эльбей Расимович Бабаев, Эльдар Мирсамедович Мовсумзаде https://creativecommons.org/licenses/by-nc/4.0
Improvement of the electric drive of ball mills of ore processing plants by using pole - changing asynchronous motors
Relevance. Currently, in developed countries, research is being conducted to study the issue of increasing the efficiency of production and automation of the technological process, as well as the introduction of new technologies into production. Based on this, special attention is paid to the creation of new energy- and resource-saving electric drives that make it possible to increase the service life of active parts of mechanisms by facilitating the start-up process and simplifying the technological process by ensuring precise stopping of high-inertia grinding mechanisms. In this direction, one of the priority tasks in this field is the development of adjustable electric drives based on multi-speed motors that meet the operational requirements of grinding mechanisms. Along with this, an important task is the development of new pole-changing winding schemes with improved electromagnetic properties and simple manufacturing technology used in multi-speed motors. Aim. To improve the electric drive of ball mills for rock grinding through the application of multi-speed electric motors with pole-changing windings. Methods. Method of discretely specified spatial functions based on formalized logic, along with methods of vector and harmonic analysis, the theories of linear algebra and electrical machines, the graph-analytical method for constructing magnetizing force diagrams and Fourier series decomposition, as well as experimental investigations of the static and mechanical characteristics of electrical machines. Results. In accordance with the operational requirements of ball mill electric drives, a novel pole-changing winding scheme for a two-speed induction motor was developed. The developed design was patented in the Republic of Uzbekistan. Based on the proposed scheme, a prototype of the new two-speed motor was designed, manufactured, and subjected to industrial testing. The obtained electrical and mechanical performance characteristics demonstrated full compliance with the technical specifications required for ball mill drives. The newly developed two-speed asynchronous motor was subsequently implemented in the electric drive of an МSh-1 type ball mill, installed in the 35th workshop of the Research and Production Association for Rare Metals and Hard Alloys at Almalyk Mining and Metallurgical Complex JSC. The achieved annual economic effect amounted to 13200 conventional units. For citation: Bobojanov M.K., Rismukhamedov D.A., Tuychiev F.N., Shamsutdinov Kh.F., Ufa R.A. Improvement of the electric drive of ball mills of ore processing plants by using pole-changing asynchronous motors. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 35-43. https://doi.org/10.18799/24131830/2026/6/5331
Copyright (c) 2026 Руслан Александрович Уфа, Махсуд Каландарович Бобожанов, Dauletbek A. Rismukhamedov https://creativecommons.org/licenses/by-nc/4.0
Machine learning-based analysis of borehole geophysical logs in coal mining
Relevance. Coal remains a crucial fossil fuel source globally, significantly contributing to economic and industrial development. Efficient coal extraction relies heavily on accurate identification and evaluation of coal deposits, where geophysical methods, particularly well-logging, play a pivotal role. Aim. To enhance the accuracy and efficiency of determining coal seam depth and thickness by applying advanced machine learning techniques to well-logging geophysical data. This approach seeks to optimize coal exploration by automating data analysis, reducing human error, and improving the precision of subsurface assessments critical for efficient resource extraction. Objects. Well-logging geophysical data collected from multiple boreholes in a coal mine in Quang Ninh province, Vietnam. This region, a hub for coal production, provides a rich dataset for testing and refining machine learning models tailored to real-world mining conditions. Methods. A variety of machine learning algorithms, including regression and classification techniques, were utilized to process and analyze the well-logging data. These models were trained and validated using labeled datasets derived from borehole measurements, enabling accurate predictions of coal seam depth and thickness with enhanced precision and reliability. Results. The machine learning models achieved an impressive predictive accuracy of up to 89% when compared to actual sample data. These findings demonstrate the transformative potential of integrating artificial intelligence into geophysical analysis. By offering improved reliability, time efficiency, and accuracy in coal seam characterization, this approach supports more sustainable and cost-effective coal extraction practices, paving the way for broader adoption in the mining industry. For citation: Vu Hong Duong, Nguyen Tien Hung, Nguyen Minh Hoa, Nguyen The Vinh. Machine learning-based analysis of borehole geophysical logs in coal mining. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 44-55. https://doi.org/10.18799/24131830/2026/6/5224
Copyright (c) 2026 Хонг Зыонг Ву, Минь Хоа Нгуен, Тиен Хунг Нгуен, Тхе Винь Нгуен, Суан Зуи Нгуен https://creativecommons.org/licenses/by-nc/4.0
Water injection performance and incremental oil recovery in the Lower Kura Depression: a case study of the Mishovdag field
Relevance. This study investigates the potential for incremental oil recovery through water injection in selected wells in the Lower Kura Depression (in the case of Mishovdag field). The evaluation was carried out using a simplified material balance-based approach, which considers injected water volumes, displacement efficiency (Ed≈26%), and oil density (ρoil≈886 kg/m³). Aim. To maintain or increase reservoir pressure and to improve oil recovery. Methods and results. For each well, the additional oil production resulting from water injection was calculated in metric tons, providing a quantitative assessment of the method effectiveness. The injected water volumes varied from 1.87 to 2.77 million cubic meters per well, leading to estimated incremental production ranging from approximately 432 to 639 thousand tons. These results demonstrate that water injection can significantly enhance oil recovery in the studied wells, even under simplified assumptions. Although the calculations do not account for reservoir heterogeneity, fracture networks, or non-uniform water distribution, they provide an important preliminary estimate of recovery potential. Conclusions. The study highlights the relevance of integrating operational data with displacement efficiency parameters to assess secondary recovery performance. Overall, the findings confirm that water injection is a viable and effective method to increase production and optimize recovery strategies in complex reservoirs of the Mishovdag field. For citation: Ganbarova Sh.A. Water injection performance and incremental oil recovery in the Lower Kura Depression: a case study of the Mishovdag field. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 56-64. https://doi.org/10.18799/24131830/2026/6/5586
Copyright (c) 2026 Шура Али Ганбарова https://creativecommons.org/licenses/by-nc/4.0
Forecasting operating modes of large-scale electrochemical apparatus for fluorine production
Relevance. Fluorine is produced industrially by electrolytic decomposition of hydrogen fluoride from a melt of potassium hydrofluoride (trifluoride) KF 2HF, mainly by the so-called medium-temperature method at temperatures from 80 to 115°C. In apparatuses (electrolyzers) having the shape of a rectangular parallelepiped, the main structural elements are a steel body and a louvered cathode, a carbon (coke) anode, a bell, electrolyte heating and cooling systems, as well as monitoring and control systems. Aims. An experimental study of the impact of electrolysis voltage, electrolyte temperature, and hydrogen fluoride concentration in the electrolyte on the anode current density, anode gas yield, and fluorine content in the anode gas during the electrolytic production of fluorine in a pilot electrolyzer. Derivation of a multiple regression equation based on the dependence of the anode current density on the previously specified process parameters for a pilot electrolyzer and its comparison with a similar equation obtained earlier for a laboratory electrolyzer. Methods. Experimental and theoretical studies, physicochemical and chemical methods of analysis. Object. Laboratory and pilot plant for medium-temperature fluorine production. Results. The authors have studied the effect of the electrolysis voltage (U) from 5 to 15 V, electrolyte temperature from 80 to 120°C, hydrogen fluoride concentration from 37.0 to 41.5 wt % on the anode current density (i, A/cm2) in a pilot electrolyzer. It was established that the anode current density grows proportionally to the increase in electrolysis voltage, while the yield of the anode gas grows and the fluorine content in it increases; with an increase in the process temperature, the electrolysis voltage decreases, which leads to growth in the amount of the released anode gas and the fluorine content in the anode gas; with an increase in the HF content in the electrolyte, the voltage of the electrolysis decreases and the amount of the released anode gas grows. By processing experimental data obtained in a pilot electrolyzer, a multiple regression equation was derived for the dependence of anode current density on voltage, temperature, and hydrogen fluoride concentration. The multiple regression equations obtained in the laboratory and pilot electrolyzer studies are similar, and the second equation can be derived from the first by multiplying by an adaptation coefficient of 0.182. Thus, the results of the laboratory studies allow us to predict the performance of pilot and industrial electrolyzers. For citation: Sofronov V.L., Tkachuk S.A. Forecasting operating modes of large-scale electrochemical apparatus for fluorine production. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 65-73. https://doi.org/10.18799/24131830/2026/6/5449
Copyright (c) 2026 Владимир Леонидович Софронов, Семён Александрович Ткачук https://creativecommons.org/licenses/by-nc/4.0
Environmental assessment of the impact of tire and road wear particles on the waters of the Arctic Ocean seas
Relevance. During the operation of tires, tire and road wear particles are formed. The environmental assessment of their impact on the waters of the Arctic Ocean seas has not been sufficiently studied. Aim. To assess the environmental impact of tire and road wear particles on the waters of the Arctic Ocean marginal seas. Methods. To identify tire and road wear particles, an IRTracer-100 FT-IR spectrometer (Shimadzu, Japan) with an attenuated total internal reflection attachment (Specac Ltd, Orpington, UK) and an Imager.Z1 microscope with an HBO-100 illumination system (Carl Zeiss, Germany) were used. Statistical methods. Results and conclusions. Tire and road wear particles are present in the waters of the Arctic Ocean. Moreover, they are wastes. Their physical characteristics of are somewhat similar to the ones of microplastics: the mass of tire and road wear particles is 0.55 mg [0.10; 1.40], size – 1.20×1.10 mm [0.90×0.70; 2.10×2.10], area – 1.43 mm2 [0.63; 4.37], which characterizes tire and road wear particles as a large microplastics, including particle sizes from 1 to 5 mm. However, the chemical characteristics of tire and road wear particles differ from those of microplastics due to the synthetic nature of origin (79.6%), non-fibrous structure (95.9%), gray (30%) or black (30%) color, dominance of calcium stearate and water-based polyurethane varnish in the chemical composition, which are unfavorable in terms of environmental risk. Thus, tire and road wear particles are independent type of waste that has a detrimental effect on the environment. The results obtained dictate the need for further more detailed study of the nature of tire and road wear particles and assessment of their impact on the ecology of the hydrosphere. For citation: Mazlova E.A., Lobanov A.V., Blinovskaya Ya.Yu. Environmental assessment of the impact of tire and road wear particles on the waters of the Arctic Ocean seas. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 74-86. https://doi.org/10.18799/24131830/2026/6/5192
Copyright (c) 2026 Елена Алексеевна Мазлова, Алексей Валерьевич Лобанов, Яна Юрьевна Блиновская https://creativecommons.org/licenses/by-nc/4.0
Risks of effect of diapirism development stages on oil and gas content in Shamakhi-Gobustan and Kura-Gabirri depressions
Relevance. Diapir folds and mud volcano distribution areas that related to a high stage of their development are associated with negative geostructural elements developed in orogens. It should be noted that compressional stresses arising in the collision zones of the Greater Caucasus and Lesser Caucasus play a major role in the formation of the structural-tectonic plan of the Kura-Gabirri interfluve depression. The thickness of the sedimentary layer in the depression is 12 km, and 41% of the sedimentary layer section is consists of clay rock. The geodynamic conditions of the depression and the lithofacies composition of the sedimentary layer are quite favorable for the development of diapirism and mud volcanism. Since the Shamakhi-Gobustan depression is located in the crest position zone of the southwestern limb of the Greater Caucasus, the geodynamic and tectonic processes occurring in this mountain fold system are intensively reflected in the Shamakhi-Gobustan synclinorium, leading to the development of diapir-type folds, overthrust, nappe-type structures and mud volcanism in its structure. Aim. To determine the intensity of compressional stresses arising along the tectonic zones of the area of the Kura-Gabirri and Shamakhi-Gobustan depressions of the South Caspian megabasin and the effect of the lithofacies composition of the sedimentary layer on the development of cryptodiapir, diapir and other folds, as well as the manifestation of mud volcanism. Methods. The research method is based on the analysis of the change in the intensity of compressional stresses arising from geodynamic conditions over the territory and the impact of the lithofacies composition of the sedimentary layer on the morphology of cryptodiapir, diapir and other folds, as well as on the manifestation of mud volcanism. Conclusions. İt was identified that from north to south, the surface of Mesozoic sediments are subsided, the thickness of the Cenozoic complex sharply increase, and due to its horizontal displacement the tectonic stresses reach their maxsimum level in the southern subsiding areas (South Gobustan, Alat Range). As a result, the Pliocene structural level is represented by sandy-clayey sediments of a very large thickness (5 km). The clay diapirs and folds located here are configurated by Paleogene-Miocene and Pliocene sediments. Therefore, the largest mud volcanoes are located in these areas. For citation: Nasibova G.J. Risks of effect of diapirism development stages on oil and gas content in Shamakhi-Gobustan and Kura-Gabirri depressions. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 87-98. https://doi.org/10.18799/24131830/2026/6/5539
Copyright (c) 2026 Gultar Nasibova https://creativecommons.org/licenses/by-nc/4.0
Analysis of arch support parameters effect on the intensity of air heat exchange with the surrounding rock mass
Relevance. The need to improve the accuracy of thermal calculations in the design of ventilation and air conditioning systems for deep underground mines. Aim. To analysis the effect of structural features of mine support systems on heat exchange between the ventilation airflow and the surrounding rock mass. Object. Mine air interacting with the structural elements of arched mine support. Methods. Numerical simulation of heat and mass transfer in the air environment of a mine working, and approximation of the convective heat transfer coefficient correlations based on multiparametric modeling data. Results. The authors have carried out a three-dimensional numerical simulation of heat and mass transfer in a mine working for various distances between support elements and different airflow velocities. It was found that decreasing the spacing between support legs significantly increases the convective heat transfer coefficient due to enhanced flow turbulence and a larger heat exchange surface area. The key outcome of the study is an empirical correlation for the heat transfer coefficient as a function of the average ventilation flow velocity and the structural parameters of the support, which determine the macro-roughness of the working walls. The obtained data complement previous research findings and can be used in the design of mine ventilation and air conditioning systems, as well as in the development of safety measures addressing the thermal factor in underground mining operations. For citation: Popov M.D., Semin M.A., Grishin E.L. Analysis of arch support parameters effect on the intensity of air heat exchange with the surrounding rock mass. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 99-109. https://doi.org/10.18799/24131830/2026/6/5174
Copyright (c) 2026 Максим Дмитриевич Попов, Михаил Александрович Семин, Евгений Леонидович Гришин https://creativecommons.org/licenses/by-nc/4.0
Modeling thermal field in two-phase oil-water filtration in a heterogeneous reservoir considering thermodynamic effects
Relevance. Assessing heterogeneity parameters in the near-wellbore zone, such as the radius and permeability of the altered zone, is crucial for optimizing oil production and the effectiveness of reservoir stimulation techniques. Traditional methods have limitations, while thermometry, successfully applied for single-phase filtration (Chekalyuk's method), requires validation for the widely encountered two-phase (oil-water) conditions in practice. It remains insufficiently studied whether the classical approach of analyzing temperature curves retains its diagnostic value for the separate assessment of the altered zone radius and permeability under two-phase filtration conditions. Object. Non-isothermal two-phase (oil-water) filtration in a porous medium (reservoir) with a radial zone of altered permeability during fluid production at a constant rate. Aim. To investigate the influence of the near-wellbore zone parameters on bottomhole temperature dynamics during two-phase filtration, considering thermodynamic effects (Joule–Thomson, adiabatic); and to evaluate the informativeness of analyzing temperature dynamics and its logarithmic derivative for the separate assessment of the altered zone radius and permeability distribution in the near-wellbore zone under two-phase conditions. Methods. Numerical modeling based on a developed mathematical model that includes phase mass conservation equations (incorporating Darcy's law) and heat transport equations, accounting for convection, thermal conduction, and thermodynamic effects. Sensitivity analysis of the temperature response to variations in the radius and permeability of the near-wellbore zone. Results. It is shown that the bottomhole temperature dynamics is sensitive to the radius of the altered zone and the permeability distribution within the near-wellbore zone. Analysis of the logarithmic temperature derivative revealed that the time τ, corresponding to the derivative maximum, is predominantly determined by the radius of the altered zone, whereas the magnitude of this maximum significantly depends on its permeability. Furthermore, it was established that both these indicators (time τ and the magnitude of the derivative maximum) depend as well on the reservoir water saturation, which determines the phase composition of the flow. This confirms that the classical thermal interpretation approach retains its informativeness and is potentially applicable for the separate assessment of the near-wellbore zone parameters during two-phase oil-water filtration, provided that the effect of the flow phase composition is correctly considered. For citation: Islamov D.F., Ramazanov A.Sh., Davletshin F.F., Akchurin R.Z. Modeling thermal field in two-phase oil-water filtration in a heterogeneous reservoir considering thermodynamic effects. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 110-121. https://doi.org/10.18799/24131830/2026/6/5157
Copyright (c) 2026 Денис Фавилович Исламов, Айрат Шайхуллинович Рамазанов, Филюс Фанизович Давлетшин, Руслан Зуфарович Акчурин https://creativecommons.org/licenses/by-nc/4.0
Increasing the reliability of the forecast of structure resource potential due to scientific justification of trap filling factor
Relevance. The need to minimize the risks associated with prospecting, appraisal, and exploration drilling, and to increase the efficiency of geological exploration works. The approach presented is an example of rational planning and it ensures consistently high-performance indicators of work in the region – the success rate of prospecting drilling and the confirmability of the resource base. Aim. To establish patterns of filling hydrocarbon traps to increase the reliability of resource forecasts on promising uplifts, as well as to search for objects for additional exploration of hydrocarbon deposits being developed. Objects. Prepared, identified structures, industrial hydrocarbon deposits with an uncertain fluid contact. Methodology. Methodological approaches to increasing the reliability of forecasting the resource potential of promising structures through scientific justification and application of the coefficient of filling hydrocarbon traps by the method of analogies using methods of mathematical statistics. Results. The authors have identified zonal patterns of the degree of trap filling with oil for the main oil and gas production areas of the Perm Krai, substantiated and tested the methodological approaches to forecasting the position of fluid contacts of promising structures and deposits of fields with the accepted conditional calculation level. The authors carried out reassessment of the resource base, an audit of the fund of prepared and identified structures; for already discovered deposits with an uncertain fluid contact (including those not taken into account by the State Balance) – a forecast of expected reserves growth. Proposals for prospecting and additional exploration were prepared for geological exploration sites. For citation: Nikitina M.V., Kostareva K.V., Filimonchikov A.A., Soloviev S.I. Increasing the reliability of the forecast of structure resource potential due to scientific justification of trap filling factor. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 122-132. https://doi.org/10.18799/24131830/2026/6/5267
Copyright (c) 2026 Марина Васильевна Никитина, Ксения Викторовна Костарева, Александр Алексеевич Филимончиков, Станислав Игоревич Соловьев https://creativecommons.org/licenses/by-nc/4.0
Reactive fluid flow during vegetable oil transesterification using droplet microfluidics
Relevance. There are many configurations of microfluidic chips that can be used to produce biofuel from various vegetable oils. Studies of this kind do not pay sufficient attention to the hydrodynamics of the interaction of reacting flows in micromixers and microreactors. Identifying the mechanisms and characteristics of droplet/slug formation of a dispersed medium as it moves through microchannels and controlling this process can help optimize ester production and maximize yield. Object. Converton of rapeseed oil into fatty acids methyl esters through the prism of the consequences of microfluidics of two-phase flow in a micromixer and microreactor. Aim. To identify and quantitatively characterize the hydrodynamic consequences of the interaction between flows of potassium hydroxide solution in methanol and rapeseed oil during microfluidic preparation of fatty acid esters using a chip with a configuration based on a T-shaped micro-mixer and a coil micro-reactor. Methods. The droplet microfluidics method for managing the flow of liquids through microchannels for transesterification of rapeseed oil, high-speed video recording to detect the effects of hydrodynamic interaction of immiscible liquids, additive manufacturing based on a digital model using Digital Light Processing technology to manufacture elements of a microfluidic system for transesterification. Results. As a result of analyzing experimental data on the flow of reactive liquid during vegetable oil transesterification, the boundaries of two-phase flow regimes (slug and Plateau–Rayleigh instability) and the effect of heating liquids to 55°C on these boundaries were identified when compared to the case without forced heating. Among the established flow regimes, the slug one is preferable, as it allows oil conversion to be controlled and characterized. Practical recommendations were formulated for optimizing ester production and maximizing their yield. It is shown how, through a rational analysis of the effect of the volumetric flow rates of the reacting liquids and their ratio on the hydrodynamic consequences, the nature of the two-phase flow, its quantitative parameters, and the associated conversion characteristics can be determined. The paper demonstrates an approach to controlling oil conversion intensification in a microreactor by introducing and tracking the ratio of the length of the slugs to the distance between adjacent slugs in the resulting flow and its dependence on the flow rate of the two-phase liquid. The closer this ratio is to 0, the more intense the conversion and the potentially higher the yield of fatty acid esters. It was established that the size of the slugs and the distance between them are significantly sensitive to the temperature of the interacting liquids due to the changing interfacial tension between them. For citation: Zelentsov D.O., Piskunov M.V., Chobotova V.M., Khomutov N.A. Reactive fluid flow during vegetable oil transesterification using droplet microfluidics. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 133-144. https://doi.org/10.18799/24131830/2026/6/5306
Copyright (c) 2026 Дмитрий Олегович Зеленцов, Максим Владимирович Пискунов, Владлена Михайловна Чоботова, Никита Андреевич Хомутов https://creativecommons.org/licenses/by-nc/4.0
Fishing features during the overhaul of complicated emergency oil and gas wells
Relevance. The need to solve a number of scientific, practical and engineering problems in fishing during the overhaul period. The article introduces the information about the causes of accidents in the overhaul of wells, fishing features, which determine and affect the factors and occurrence of the need to repeat the operation, after fishing completion. The last few decades, the bottom of the wells in the AzOil, are planted 139.7 mm operating column and K100-78 collar socket, very often used in the emergency operations, is impossible in it, due to its large external diameter. If it is impossible to maintain underground repair using cable equipment, in wells equipped with intra-working equipment for safe exploitation, the cause of which is prolonged functioning and committed technological disorders during the development and operation of the well, there is an emergency repair work – the extraction of equipment with tubing, using the left drill pipes. For the indicated reasons, the extractive equipment of the complex structure does not succeed in the extracting of intra-abdominal equipment, in view of their overall dimensions; they are extracted in parts that complicates the repair work and extends the deadlines for the repair of wells. The complications lie in the fact that when extracting in parts with standard catchers, one of the constituent elements in mutual contact may be an obstacle to the capture of other elements, and when extracting it is possible to change the location of the constituent elements and it becomes difficult to choose the right tool for subsequent fishing. Aim. To assess and improv the quality of fishing, including when extracting intra-vital equipment of a complex structure. Methods. Correction of fishing methods and improving structures of standard fishing tools adapted to well conditions. Results and conclusions. The use of adjusted fishing methods and advanced standard fishing tools corresponding to the wells, created and ensured the possibility of high-quality, reliable capture and removal of fishing objects from the well. For citation: Ibragimov Yu.A. Fishing features during the overhaul of complicated emergency oil and gas wells. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 145-158. https://doi.org/10.18799/24131830/2026/6/5050
Copyright (c) 2026 Юсуф Абульфаз оглы Ибрагимов https://creativecommons.org/licenses/by-nc/4.0
Experience in developing Nasedkino gold deposit using modeling
Relevance. In modern conditions, the issue of enhancing gold mining efficiency and optimizing natural resource utilization has become acute. This is due to the depletion of easily accessible deposits, rising production costs, and the need to ensure sustainable development of the mining industry. Rational development of gold-bearing deposits has become a priority task for mining companies. Aim. To develop a comprehensive deposit model based on operational data analysis for detailed assessment of potential reserves and formulation of an optimal mining strategy. Special attention is paid to creating accurate predictive models that help minimize risks during deposit development. Methods. Comprehensive approach, including: detailed analysis of the paleogeodynamic environment of deposit formation; thorough examination of geological-structural data; processing of operational work results; geodynamic modeling using modern software complexes; assessment of the impact of tectonic processes on ore body formation; analysis of hydrothermal activity. Results and Conclusions. Geodynamic conditions of the Nasedkino deposit are characterized by a complex multistage structure formed because of successive tectonic disturbances and hydrothermal processes. The developed model enabled identification of promising zones with high gold potential, determination of optimal mining parameters, development of recommendations for improving mining efficiency. The practical significance of the work lies in the possibility of applying the obtained results for: improving methods of deposit reserve assessment; optimizing mining technological processes; enhancing the efficiency of developing ore objects with complex geological structures. The research conclusions emphasize the necessity of a comprehensive approach to studying geodynamic conditions of deposits as a key factor for successful exploitation of ore objects. For citation: Pikapova M.V., Korolkov A.T. Experience in developing Nasedkino gold deposit using modeling. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 159-171. https://doi.org/10.18799/24131830/2026/6/5280
Copyright (c) 2026 Мария Васильевна Пикатова, Алексей Тихонович Корольков https://creativecommons.org/licenses/by-nc/4.0
Ecogeochemical state of groundwater in Southeastern Transbaikalia under salinization effect
Relevance. Fresh groundwater salinization represents a global environmental challenge exacerbated by climate change. A key area of concern is Southeastern Transbaikalia (bordering Mongolia), an internationally recognized unique natural landscape. Beyond climatic drivers, this region is characterized by complex geology and numerous metallic ore deposits, which significantly contribute to the hydrogeochemical signatures and elemental loading of the groundwater. Aim. To evaluate the eco-geochemical status of shallow groundwater within the Torey Lakes region. Objects. Groundwater from the upper dynamic zone (n=59). Methods. Major ion chemistry was determined using standard titrimetric, potentiometric, and photometric methods, alongside flame atomic absorption and emission spectrometry. Trace elements were analyzed via ICP-MS. Spatial data processing was conducted in ArcGIS, while statistical relationships were evaluated using the Statistica software package. Chemical speciation and Eh-pH stability were modeled using The Geochemist's Workbench to assess the toxicity and migration forms of key components. Results and conclusions. Despite low anthropogenic pressure, the groundwater accumulates a wide range of elements (F, NO3, NH4, Br, B, Li, U, As, Fe, Mn, Cu, Zn, Sr, Ba, Se, Be, Sb, Cd, Al, Pb, Cr, and V); however, only Br, Li, Fe, and F consistently exceed regulatory thresholds. Hydrochemical trends reveal that most major and trace element concentrations increase along the flow path from recharge to discharge zones, with local overprinting by ore mineralization. It is shown that soda-type water formation controls the accumulation of Li, B, As, U, and F, while evaporative concentration governs the levels of Br, Cl, and nitrogen compounds. Geogenic sources include aluminosilicate host rocks for Fe, Mn, and Pb, and sulfides for Cu and Zn. Furthermore, elevated concentrations of nearly all these elements spatially correlate with ore occurrences in the Aginskaya tungsten-tin-rare metal metallogenic province. Speciation analysis suggests that arsenic predominantly accumulates in less toxic forms, whereas copper and nitrogen compounds may occur in more hazardous states. For citation: Drebot V.V., Lepokurova O.E. Ecogeochemical state of groundwater in Southeastern Transbaikalia under salinization effect. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 172-187. https://doi.org/10.18799/24131830/2026/6/5627
Copyright (c) 2026 Валерия Витальевна Дребот, Олеся Евгеньевна Лепокурова https://creativecommons.org/licenses/by-nc/4.0
Controlled shift of a neutral point of a cascaded high-voltage frequency converter: control strategy, simulation, and experimental verification
Relevance. The failure of a power cell in a cascaded H-bridge high-voltage variable frequency drive causes phase voltage asymmetry and triggers instantaneous protection systems, which at remote oil and gas facilities leads to multi-day shutdowns of process equipment. The traditional approach to restoring operability based on hardware redundancy increases equipment costs by 15–25%. Aim. Development and experimental verification of a software algorithm for controlled neutral point shifting in a cascaded multilevel inverter, ensuring symmetry of line-to-line voltages at the load under emergency operation when faulty power cells are bypassed without the use of hardware redundancy. Methods. The balancing algorithm is integrated into a conventional field-oriented control system for a three-phase AC motor by modifying the inverse Clarke transformation matrix. For a 13-level cascaded H‑bridge inverter, the computational process for finding the desired neutral point shift is automated by solving a system of high-order nonlinear equations. A simulation model is developed in MATLAB/Simulink with adaptive recalculation of the phase shifts of the carrier signal generators for scalar pulse width modulation with a triangular instantaneous waveform, implemented according to the phase-shifted pulse width modulation principle. Experimental verification of the developed algorithmic principles for line voltage balancing was performed on an industrial test bench at ZAO «ERASIB», Novosibirsk, based on a production model of the «ERATON-V» drive (6 cells per phase, 1140 V) and a 30 kW induction motor. Results and conclusions. Digital simulation confirms that the proposed adaptive recalculation of phase shifts preserves the instantaneous harmonic shape of the phase currents when cells are bypassed. For configurations 5-6-6, 5-5-6, and 5-5-5, the reduction in line voltage ranges from 5.8 to 16.6%, which is acceptable for pump and fan loads. The algorithm operability is experimentally confirmed for the failure of one, two, and three cells, as the control system automatically ensures symmetry of line voltages and sinusoidal stator currents of the electrical machine without hardware redundancy. The discrepancy between experimental data and simulation results does not exceed the engineering accuracy level of 5%, allowing this technical solution to be used in production models of the «ERATON-V» drive. For citation: Sidorov G. S., Nos O. V. Controlled shift of a neutral point of a cascaded high-voltage frequency converter: algorithm, simulation and experimental verification on industrial equipment. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 188-202. https://doi.org/10.18799/24131830/2026/6/5707
Copyright (c) 2026 Георгий Сергеевич Сидоров, Олег Викторович Нос https://creativecommons.org/licenses/by-nc/4.0
Assessment of the state and possibility of including in urban planning activities turnover the territories man-made damaged during the development of deposits
Relevance. The need to return the disturbed land plots located within the city limits to the public in a timely manner. Since the current rate of reclamation is very low compared to the annual volume of disturbances and does not always take into account the real needs of the population, it is necessary to pay close attention to the problem of restoring such territories. Aim. Assessment of the possibility of including territories technogenically disturbed during mining operations in urban development circulation for the subsequent selection of the direction of their optimal use. To achieve this goal, the following objectives were set: analyze construction material deposits located within the Novosibirsk agglomeration; identify man-made sites that could be included in urban development activities; assess the condition of the land using a specific selected site as an example; and consider the possibility of subsequently using such a site as a recreational area. Methods. Analysis of the geological, hydrogeological, and engineering-geological conditions of the occurrence of the construction rock deposits under consideration, as well as literary sources; mapping of man-made lands based on determining factors, synthesis of approaches to assessing their condition according to the proposed criteria; determination of trace gas components and aerosol parameters using a Yak-40 laboratory aircraft equipped with specialized equipment. Results and conclusions. The authors have identified six objects that potentially correspond to the urban development plan of citywide significance and suitable for functional use in the system of recreational spaces. Their condition was assessed using a methodology that includes 11 criteria, and a matrix was compiled according to the levels of impact on the environment. The data and indicators obtained during the study suggest that not all flooded reservoirs are suitable for use as recreational areas or leisure zones, and, taking into account the analysis of the data obtained, it is proposed to return the active Borok and Mochische open pin to use through alternative reclamation methods. It is shown that the use of a recreational area with the creation of a multi-purpose reservoir as an environmental direction of land reclamation is not always possible, since these objects must comply with the regulatory requirements for water bodies and adjacent recreation areas. Using the example of the Borok, several options for alternative use of the quarry as a recreational area are proposed. For citation: Nemova N.A., Reznik A.V., Erokhin G.P. Ivlev G.A., Kosarev N.S., Klimova E.V., Bushuev A.V., Arbuzov S.A. Assessment of the state and possibility of including in urban planning activities turnover the territories man-made damaged during the development of deposits. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 203-220. https://doi.org/10.18799/24131830/2026/6/5218
Copyright (c) 2026 Наталья Анатольевна Немова, Александр Владиславович Резник, Григорий Порфильевич Ерохин, Георгий Алексеевич Ивлев, Николай Сергеевич Косарев, Екатерина Владимировна Климова, Александр Викторович Бушуев, Станислав Андреевич Арбузов https://creativecommons.org/licenses/by-nc/4.0
Elemental composition of human hair in mining regions of Zabaykalsky Krai
Relevance. The necessity to develop criteria for assessing the state of the environment determines the relevance of this study. Modern conditions require a comprehensive biogeochemical study of objects and components of the biosphere. Local technogenic impact leads to uneven accumulation of chemical substances in the human body. Studying the elemental composition of hair allows us to assess the degree of such impact. Hair serves as a reliable indicator of environmental changes caused by human activity. Research was conducted in eastern districts of Zabaykalsky Krai, covering settlements Sherlovaya Gora, Khapcheranga, Nerchinsky Zavod, and Klitchka. Aim. To identify the features of the elemental composition of the population hair as an indicator of local mining and industrial technogenesis Methods. Instrumental neutron activation analysis was used to analyze samples, allowing precise determination of content levels of 28 chemical elements. Results and conclusions. The research revealed characteristic features of the chemical composition of local residents' hair reflecting industrial development in different populated areas of Zabaykalsky Krai. The largest industrial base is located in Nerchinsky Zavod village, which manifests itself in elevated concentrations of Ca, Sc, Cr, Fe, Co, Zn, Sb, Cs, Ba, Eu, and Hf. Although most industrial enterprises were closed as early as the 20th century, Na, Sc, Cr, Fe, Co, As, Ag, Sb, Ba, Lu, Hf, Ta, Au, Th, and U were found in the hair of residents of the Sherlovaya Gora. In the hair of residents of the Khapcheranga village situated near an exhausted tin-polymetallic deposit, significant accumulation of Sc, Cr, Fe, Nd, Tb, Hf, and Th was found. The village Klichka, known for its specialization in the mining and processing of polymetallic ores, is characterized by high levels of Ca, Zn, and U in the hair of its residents. The elemental composition of Zabaykalsky Krai inhabitants’ hair reflects the impact of ore-mining and processing industries and forms under the effect of both natural and anthropogenic factors. Accumulation of rare earth elements is observed in this region. In areas where waste from ore processing plants was stored, children's hair exhibits concentrations of chemical elements typical of the locally mined and processed raw materials. Thus, children's hair acts as an indicator of technogenic load on their place of residence. For citation: Baranovskaya N.V., Mikhailova L.A., Kazakova A.A., Ageeva E.V., Vershkova E.M., Narkovich D.V., Azarova S.V. Elemental composition of human hair in mining regions of Zabaykalsky Krai. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 221-234. https://doi.org/10.18799/24131830/2026/6/5348
Copyright (c) 2026 Наталья Владимировна Барановская , Лариса Альфредасовна Михайлова, Алёна Алексеевна Казакова, Елена Владимировна Агеева, Елена Михайловна Вершкова, Дина Владимировна Наркович, Светлана Валерьевна Азарова https://creativecommons.org/licenses/by-nc/4.0
Innovative technologies for studying well killing in fields with hard-to-recreate reserves
Relevance. This article is devoted to the problems of killing oil and gas wells. The problem of silencing wells was raised in relation to modern high-tech complex wells. Unification of such wells will need to be performed a large number of times during their lifetime, starting from the initial opening of the reservoir to liquidation. Aim. To present one of the solutions in the overall structure of the necessary measures to study and solve technical, geological and technological problems of killing well. Methods. Methods of pumping well killing fluid into a well, regarding the possibility of creating circulation, and the downhole equipment used. Problem statement. As a rule, injecting killing fluid is carried out with high pressure on the formation, which leads to a deterioration in its physical and chemical properties. Therefore, it is necessary to manage and control the operation of technical equipment and technology, create process models taking into account the profile of wells with different types of horizontal sections, i. e. killing wells with controlled pressure, which can be achieved by developing and creating a mobile software and hardware complex that allows killing wells with controlled pressure, preventing the formation from becoming permeable. Results. An empirical formula is proposed for calculating the time of replacement of the injected solution in a well with a horizontal section. The paper introduces the stand that can be used for training and modeling well killing in difficult conditions. The authors briefly describe the methods of injecting the used liquid, and the design of a simulator for practicing the technologies of well killing in directional and horizontal wells, as well as introduce its main elements and operating capabilities. This article will be useful for students, engineers, and teachers at higher and secondary educational institutions. For citation: Korotchenko A.N., Ovchinnikov V.P., Rozhkova O.V., Ivanov P.E. Innovative technologies for studying well killing in fields with hard-to-recreate reserves. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 235-242. https://doi.org/10.18799/24131830/2026/6/5792
Copyright (c) 2026 Андрей Николаевич Коротченко, Василий Павлович Овчинников, Оксана Владимировна Рожкова, Павел Евгеньевич Иванов https://creativecommons.org/licenses/by-nc/4.0
Fault-tolerant control of a brushless DC motor of a pump unit as part of a hazardous production facility
Relevance. Brushless direct current motors are a key component of modern pumping equipment used at hazardous production facilities, including those in the oil and gas industry. Their high energy efficiency, reliability, and compact size determine their widespread use in fluid pumping systems, where uninterrupted operation is critical for ensuring technological and industrial safety. A failure of the pump unit electric motor can cause process stoppage, lead to significant economic losses, and create conditions for emergency situations with severe consequences. Therefore, ensuring stable operation of the brushless DC drive under emergency conditions, particularly in the event of loss of one or more supply phases, is an urgent scientific and technical challenge. Aim. Development of a control algorithm for a brushless DC motor that ensures its fault-tolerant operation under open-phase conditions, as well as analysis of the effectiveness of the developed algorithm. Object. Brushless direct current motor used in a pumping unit for transporting process fluid and capable of operating under open-phase power supply conditions. Methods. Mathematical description of electromechanical processes, computer modeling. Results. The authors have developed the mathematical model of a brushless direct current motor designed for joint operation with a pumping unit. The authors carried out simulation modeling of the motor operation under normal and open-phase power supply conditions. Graphs of the volumetric flow rate of the process fluid were obtained under various operating scenarios: without and with the use of a recovery algorithm. For citation: Odnokopylov G.I., Rozaev I.A., Tinnikov P.E., Bragin A.D., Lyapunov D.Yu., Lazutkina E.E., Pantyukhina E.V., Sokolov S.S., Bolshakov R.S., Kalinichenko V.S. Fault-tolerant control of a brushless DC motor of a pump unit as part of a hazardous production facility. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 6, pp. 243-256. https://doi.org/10.18799/24131830/2026/6/5636
Copyright (c) 2026 Георгий Иванович Однокопылов, Иван Андреевич Розаев, Павел Эдуардович Тинников, Александр Дмитриевич Брагин, Данил Юрьевич Ляпунов, Елена Евгеньевна Лазуткина, Елена Викторовна Пантюхина, Сергей Сергеевич Соколов, Роман Сергеевич Большаков, Владимир Сергеевич Калиниченко https://creativecommons.org/licenses/by-nc/4.0