Introduction. The Orsk depression in the Southern Urals is considered as a promising region for oil and gas exploration. A new look at the results of his study of past years is given.

Aim. Identification of reservoir rocks and seals in the study area, identification of promising oil and gas complexes, assessment of oil and gas potential, development of recommendations for further study of the region for oil and gas.

Materials and methods. As part of the study of the prospects of the oil and gas potential of the region, well-logging data on the parametric well 1 Aschebutakskaya (Orskaya depression of the Magnitogorsk trough), drilled in 1993, were processed for the first time.

Results. Visean age limestones (Lower carboniferous) were uncovered by well 1 Aschebutakskaya from a depth of 303.5 m and up to the bottom (1261.2 m). According to well-logging data, their porosity varies from 1.0 to 12.5 %. In the upper part of the limestone there are 15 reservoir layers, the average thickness of which is 4.7 m, the total is 123.1 m. The average porosity is 8.2 %. The type of fl uid is not defi ned. The tires can be layers of mudstone isolated in the thickness of limestones, and dense diff erences of the latter.

Conclusion. The limestone strata of the Visean-Bashkir age, developed in the central part of the Magnitogorsk trough, is promising for the search for oil and gas deposits. It is recommended to process well-logging data on wells of the Ural profile (drilled in the region for oil and gas in the 70s of the last century) at the modern technical and methodological level.

Background. The results of a new stage of exploration for hydrocarbon raw materials at the beginning of 2023 along the southern part of the Verkhnelensk Mesocainozoic arch lifting, which is limited to Zhigalovsky and Bozhekhansky mega-anticlines in the southeastern part of the Angara-Lena stage are considered. Compared with the materials of oil and gas exploration and model representations of previous years about the geological structure of this territory. The resulting constructions have a high level of detail; this made it possible to revise many existing geological ideas about the prospects of oil and gas potential of the Verkhnelensky uplift.

Aim. The purpose of this work is a comprehensive analysis of the geological structure and prospects of oil and gas potential of natural reservoirs of the Vendian-Cambrian, including organogenic reservoirs of oil and gas in reef structures (biostromes) in the contour of positive structural forms above the protrusions of the crystalline basement, which were first identified by seismic exploration. 

Materials and methods. Under the extended shaft s, which were mapped earlier in the sedimentary cover along the halogen-carbonate thickness of the Lower Cambrian, local protrusions were found for the first time in the zones of projections of the axial parts on the surface of the heterogeneous crystalline basement according to high-precision seismic data. Earlier, over one of these protrusions, in the carbonate deposits of the Khristoforovsky horizon of the Lower Cambrian salt-bearing strata, the Znamenskoye (Balykhtinskoye) natural gas field was discovered by drilling. 

Results. Domed objects on the foundation surface, previously known only in the Atovo-Shamanov zone, are now isolated on the surface of a heterogeneous crystalline foundation within the axial parts of all major positive linear and brachianticlinal folded structures. On the northern side of the Kachugsky shaft in the deposits of the Litvintsevskaya and Angarskaya formations, in the southern side of the Zhigalovsky shaft in the Osinsky productive horizon, local pronounced domed objects with a flat base, with a sharp thickening in the core were recorded for the first time. It is suggested that in the Early Cambrian, in the axial part of the Verkholensky anticline uplift , Zhigalovsky and Kachugsky shaft s, there were conditions for the formation of biohermal structures similar to the studied biostromes of the Bozhekhansky shaft-like uplift. 

Conclusion. The connection of local positive structures (Balykhtinskaya, Typtinskaya, Znamenskaya) of the Zhigalovsky shaft and the protrusions of the foundation is documented for the first time. Above these local protrusions of the foundation, according to modern SRR data, objects with increased capacity are mapped in the intervals of known productive horizons, presumably bioherms or biostromes, which are recommended for study by drilling. On this basis, conceptions of the geological evolution of linear folding in the sedimentary brow of the Ilginckaya paleodepression are fundamentally changing. The tasks of the next stage of exploration include the study of the morphology of the protrusions of the foundation, detailing the structure of terrigenous deposits (the development of deposits of the Shaman productive horizon is expected by analogy with the Atovo-Shaman, Notai uplifts), detailing the structure of the Vendian Cambrian and Cambrian carbonate megareservoir. Organogenic reservoirs of oil and gas are expected in reef structures (biostromes) in the contour of positive structural forms above the protrusions. 

Introduction. Modern ideas and characteristics of the regional structure of the subsalt Paleozoic complex in the section of the eastern side of the Caspian basin are determined by the degree of development of deposits of carbonate and terrigenous composition and their sharply differentiated distribution within the eastern frame as a whole. New materials and geological and geophysical data in recent years indicate new opportunities for predicting promising objects (oil and gas traps), separately within lithological-stratigraphic complexes of different composition, taking into account facies, features and nature of sedimentation.

Aim. Probable search objects, taking into account the development of zones of predominant accumulation of carbonate and terrigenous deposits, differ in morphology and type of traps. At the same time, the refinement of the features of the structure and distribution of sediment complexes of different composition makes it possible to identify more favorable zones for predicting new oil and gas deposits, taking into account the distribution of characteristic types of traps in them. In this regard, the purpose of the study and this article is a theoretical justification for identifying and predicting additional zones and intervals of productivity based on new capabilities of geophysical exploration methods (seismic exploration and production geophysical methods).

Materials and methods. The data and results of the generalization of prospecting work carried out in previous years of studying the eastern side of the Caspian basin are used. The solution of the set geological problems, based on the main goal of the work, is based and demonstrated taking into account the data of the analysis of various facies sedimentation settings with the identification of zones of predominant development of carbonate (Upper Devonian — Carboniferous) and terrigenous (Lower Permian) sections. A comparative analysis of the structure of the main tectonic elements was carried out: Zhanazhol-Tortkol and Temir carbonate development zones (shallow-water shelf framing), on the one hand, internal submerged areas (steps) of the basin with relatively deep-water sedimentation conditions.

Results. The main features of the structure of Paleozoic deposits are shown on the example of the Akzhar Vostochny area (relatively deep-water zone of the sea basin) and the Urikhtau group of structures within the Zhanazhol-Tortkol zone of uplifts (shallow-water carbonate shelf), which must be taken into account when assessing the hydrocarbon potential along the section and lateral. Favorable prerequisites for substantiating the high predictive hydrocarbon potential of the carbonate units KT-III, KT-II and KT-I in terms of the Upper Devonian and Carboniferous, as well as the terrigenous Lower Permian deposits (Artinsk, Sakmarian, Aselian age) are clarifi ed and substantiated. Practical recommendations are given for further study of the Paleozoic strata, taking into account the diff erentiated distribution of carbonate bundles in the section of the onboard zone and the development, directly, within the bundles of zones containing reservoir rocks. Also, the conditions and features of sedimentation at the Lower Permian stage of sedimentation are substantiated in order to fully assess the composition and completeness of the section in order to identify additional oil and gas saturated intervals and zones.

Conclusion. A more detailed study of the structure of the section of the eastern side with an emphasis on the zones of development of predominantly carbonate and terrigenous deposits makes it possible to expand the range of possibilities and improve the methods of geophysical research. New favorable aspects are outlined for identifying additional productivity intervals, evaluating and interpreting a section with a continuous development of carbonate deposits (bundles KT-II and KT-I), as well as a favorable effect of clay minerals and “bound” water in assessing the prospects of terrigenous Lower Permian deposits.

Background. In 2019–2020, JSC Sevmorneftegeofizika (JSC SMNG) JSC Rosgeoa acquired 2D CDP reflection seismic data in Omoloy Bay of the Laptev Sea shelf. Based on these data, we studied numerous disjunctive dislocations, identified a primary and a secondary syn-shear system of dislocations, and refined the geological model of the Ust-Lena rift-induced megatrough of the Laptev Sea rift system.

Aim. The geological framework of the sediments in Omoloy Bay was studied in order to eliminate the blank between the Laptev Sea rift system in the shelf area and the Moma rift system on the adjacent land.

Materials and methods. We studied data of previous 2D CDP reflection seismic investigations conducted by geological-geophysical organisations JSC MAGE, JSC SMNG, LARGE during 1986–1997 totalling 2000 km and 2D CDP reflection seismic data of SMNG acquired in 2019–2010 totalling 6500 km. To refine the geological model of the Ust-Lena rift-induced megatrough of the Laptev Sea rift system, an author-developed method of the composition of schematic maps of horsts and grabens was used and supplemented by the identification of syn-shear systems of dislocations.

Results. The geological framework of the Ust-Lena rift-induced megatrough consisting of three rift-induced zones, viz. the Ust-Lena, the North Omoloy and the South Omoloy rift-induced zones, was defined and compared with the framework of the Moma rift system on the adjacent land.

Conclusions. The obtained results of the work refined the complicated structure of the Ust-Lena rift-induced megatrough and defined general morphologic features of the Laptev Sea and the Moma rift systems.

Abstract. There are two points of view on the geology and the nature of folding of the Sorokin trough. The proponents of the first one consider the folds as diapirs, developed within the Maikop filling of the marginal trough during lateral compression from the side of the Shatskiy swell and the Tetyaev uplift. The proponents of the second one interpret a series of fold-thrust dislocations at the base of the continental slope as structures of an accretionary wedge of dislocated sediments deposited on the suboceanic crust in the pseudosubduction zone of the Black Sea lithosphere under the Crimea.

Objective. To clarify the understanding of the structure of the Maikop series sediments within the Sorokin trough, taking into account that the trough is one of the most promising areas of the Black Sea region for hydrocarbon exploration.

Materials and methods. Based on the high-resolution seismic data obtained during the geological survey on sheets L-36-XXXV, XXXVI, a seismostratigraphic subdivision of sedimentary filling of the Sorokin trough was performed, faulting and folding in the rocks of the Maikop-Early Pleistocene formation were studied.

Results. The gravitational nature of folding in the rocks of the Maikop series within the Sorokin trough is shown. The South Crimean and South Kerch olistostromes are outlined and the surfaces of the detachment faults at the base of the olistostromes, in the lower part of the section of the Maikop series, are traced. In the upper part of the continental slope, the surface of the main scarp at upper edge of the olistostromes is mapped; below, giant olistoliths of the block rotational slides of delapsive part (sliding part) of the South Crimean and South Kerch olistostromes are located.

Near the boundary of the detrusive part (extrusive part) of the olistostromes, under lateral pressure from the weight of the olistoliths of the delapsive part, the slabs of landslide blocks are squeezed upward, forming a series of thrust sheets. At the outer boundary of the detrusive part of the olistostromes, asymmetric folds of fault propagation are formed. Zones of gas saturation of sediments associated with lateral migration of gases along rupture dislocations are confined to local uplifts of the top relief of the Maikop clays above growing folds of propagation. The development of mud volcanism is associated with AHFP zones and fluid accumulations: the formation of feeder channels, collapse depressions, mud pies or volcanic cones, fluid migration zones, gas seeps, etc.

Conclusion. The Sorokin Trough is one of the most promising areas of the Black Sea region for hydrocarbon exploration. The obtained information about the gravitational nature of folding in the trough should be taken into account when assessing the prospects for oil and gas potential and developing a strategy for developing the hydrocarbon potential of the Black Sea.

The purpose of the article. The purpose of the article is to show the possibilities of the geothermodynamic method being developed for assessing various geological and geophysical parameters of the internal structure of the upper mantle in lithospheric subduction zones (at certain values of the angle of inclination and velocity of subduction, heat flux), which allow predicting oil and gas prospective areas in the sedimentary layer of the Earth’s crust at a certain distance from the deep–water trough of the subduction zone.

Materials and methods. Using the geothermodynamic method developed in the approximation of uniform constant-viscosity fluid constituting the mantle wedge asthenosphere between the upper surface of subducting lithospheric plate and the base of the overlying lithosphere the dissipative heat flux from the asthenosphere to the base of the overlying lithospheric plate and the maximum mantle wedge temperatures are calculated numerically with the help of a finite-difference technique. The advective and conductive 2D transfer of heat generated in the mantle wedge due to viscous friction at a given motion of subducting plate is taken into account.

Results. The result shows the maximum heat fluxes observed in the rear of subduction zones at the distances of 250–300 km from the trench are shown to sufficiently well fit to the model heat fluxes calculated here for the cases of subduction of Amur, Adriatic and Black-sea micro-plates thrusting under the Okhotsk, Eurasian and Scithian lithospheric plates at the velocities of ~10 mm·a^–1, ~10 mm·a^–1, and ~3 mm·a^–1 respectively for the asthenosphere viscosity of 2·10²³ Pa·s and the no-slip conditions at the asthenosphere — lithosphere boundaries. The latter viscosity estimation can be regarded as a mean viscosity of the mantle wedge viscosity.

Conclusion. The performed studies allow us to identify oil and gas promising regions for carrying out detailed geological exploration in them on the territory of the Russian Federation and other countries.

Information about fractures plays a significant role when dealing with the exploration and production of hydrocarbons accumulated in tight rocks with low porosity and permeability. Seismic data, which has already proven to be a valuable tool for the lithology and properties prediction in conventional reservoirs, can also be used to determine zones of fracture location.

Aim. The relevance of the problem of fracture prediction is determined by the growing attention to unconventional reservoirs and associated hydrocarbons as a mean of replenishment of the resource base. Therefore, it is important to outline the set of tools available to seismic interpreters for studying fractures and to propose a methodology for their use.

Materials and methods. In this paper, we present a study of the opportunities provided by seismic data in terms of predicting azimuthal anisotropy and fracturing. Particularly, we suggest a review of the geometric attributes of the wave field, the anisotropy parameters of the amplitude vs. azimuth vs. angle variation, and the characteristics of the diffraction imaging. Our investigation is supported by examples of the real data interpretation implementing wide-azimuth 3D seismic surveys with supposedly fractured target intervals located in both clastic and carbonate environments.

Results. As a result, several approaches for combining the attributes of fractures of various nature are proposed, as well as criteria for the applicability of seismic data for predicting the presence and parameters of fractures.

Conclusion. We show that if a number of requirements for the acquisition and processing of seismic data are met, it can be successfully used to identify zones of fracture development and assess their orientation.

Introduction. The Southern Urals is considered as an oil and gas promising region. In 2022, new results of its study were obtained.

Aim. Identification of oil-producing rocks, reservoir rocks and tires in the Southern Urals, identification of potentially oil-and-gas complexes, assessment of the prospects for oil and gas potential of the Orenburg segment of the Magnitogorsk trough, development of recommendations for setting up regional geological exploration for oil and gas.

Materials and methods. As part of the study of the prospects of oil and gas potential of the region, 13 outcrops and rock sections were examined. A laboratory study of the samples was performed.

Results. The Sakmar formation (S₁-D₁sk) is composed of shales siliceous, carbonaceous-siliceous, carbonaceous-clay, clay-siliceous, phthanites. Width 150−700 m. According to the thermogravimetric analysis of shales (18 samples), the average organic substance content is 8.2 %, the maximum is 10.4 %. They belong to the «very rich» oil-producing rocks. The Sarbaev formation (D_2-3sr) is composed of siliceous and clay siltstones, siliceous-carbonaceous-clay and carbonaceous-siliceous (carbonaceous) shales, variegated jasper-like silicides. Its width is 50−300 m. According to the thermogravimetric analysis of shales (8 samples), the average organic substance content is 1,3 %, the maximum is 3,2 %. They belong to the «rich» oil-producing rocks. The oil-producing potential of the Sarbaev formation has been established for the first time. The degree of regional metamorphism of the shales of the two formations is the initial stages of catagenesis.

Conclusion. The results obtained increase the forecast prospects of oil and gas content of carbonate-terrigenous deposits of the advanced folds of the Urals (Famennian-Lowerpermian) and Magnitogorsk trough (Famennian-Middlecarbonic). The oil-producing rocks of the Sakmar and Sarbaev formations or their analogues are predicted under them. It is recommended to continue the study of sedimentary deposits of the Southern Urals as oil-producing rocks.

Introduction. The structure and distribution of permafrost in Western Siberia, especially in its northern regions (the Yamal Peninsula and the Gydan Peninsula), have remained poorly understood meantime. The paper considers the structure of the permafrost zone, obtained from the high-precision electromagnetic survey of one of the sites in the northern part of the Yamal Peninsula. 

Goal. The purpose of this study was to present the results of electromagnetic surveys to investigate the internal structure of the permafrost zone and permafrost rocks of the Yamal Peninsula. 

Materials and methods. The studies were carried out by the transient electromagnetic method in the near field zone (TEM). The method examines the transient processes that occur in the medium after a pulsed current cut-off in the transmitter loop. Nowadays the TEM method is one of the most technologically advanced techniques for studying the geoelectric properties of the first hundreds of meters of a sediments section. 

Results. Based on the results of the research, it was revealed that the cryosphere of the western part of the Yamal geocryological region is characterized by a continuous distribution of permafrost rocks with under-channel and under-lake taliks, cryopegs and discontinuous permafrost in the vertical section. 

Conclusion. Due to the fact that permafrost rocks were formed and developed under the infl uence of a large number of natural factors, their internal structure, thickness, temperature and other parameters are heterogeneous, which is reflected in the geoelectric characteristics of the section. It seems that further study and interpretation of the obtained new geophysical data from the standpoint of geocryology will shed light on the structure of the permafrost zone of the Yamal Peninsula. 

Background. The excitation of elastic waves in Vibroseis is accompanied by the appearance of harmonics, i.e. waves with multiple with respect to the fundamental one frequencies. Traditionally they have been regarded as noise and many efforts have been made to suppress them. However, over time it became clear that harmonics can be used to expand the signal spectrum. The corresponding technique is a two-stage procedure, the first step of which is the prediction of the harmonics. In the second step, this field is subtracted from the correlogram in an adaptive manner. It is possible to provide the algorithm with the desired statistical stability property in the presence of intensive random noise in case the adaptation filters have certain qualities. Here, using a real ground force signal as an example, we study the features of the adaptation filters and show that they have the required properties. This allows using them to solve the problem of broadening the seismic data spectrum by involving harmonics.

Aim. The aim of the work is not only to study the properties of the adaptation operators, including their efficient length, but also to develop an algorithm for broadening the spectrum of a vibroseis signal by involving harmonics.

Materials and methods. In the course of the study, a filed ground force signal recorded during a seismic experiment was used, as well as two raw vibroseis gathers acquired at two diff erent locations. Methods for its study involve the use of various digital filtering techniques. The method of optimal recursive filtering is also used, which makes it possible to separate the wavefield associated with the main sweep signal from the wavefields associated with harmonics.

Results. The main result of the work is the conclusion about the small efficient length of the adaptation filters, which allows them to be used to solve the problem of broadening the seismic data spectrum.

Conclusions. The separation of the seismic data associated with the main sweep signal from the data associated with the harmonics is possible due to the fact that the adaptation filters have a simple shape and a small efficient length. After separation of the wavefields, it becomes possible to use harmonics to broaden the signal spectrum to increase the resolution of the seismic data, as well as to refine the depth images.

At present, most of the oil fields are at the final stage of development and have high water cut production. The main part of the production is achieved through the water injection system by injecting water into the target reservoirs. The injection of water into the reservoir in excess of the target parameters causes a breakthrough along the most permeable interlayers and fluid escapes to other horizons not covered by development. Because of this, a large number of challenges arise in the direction of fast and efficient management of the water injection system.

Aim. In this work, a comprehensive analytical approach was developed to quickly and efficiently search for problem areas and candidates for well interventions based on a limited set of data. The methodology allows to reduce the labor costs of specialists when analyzing a large amount of data.

Materials and methods. The integrated approach is based on modified Spearman correlation and auto-interpretation of Chen plots. The time delay of the response on the dependent well was taken into account when determining the quality of communication between wells using non-parametric correlation. The combination of Spearman’s coefficients between injectivity and various production well parameters is also considered. To speed up the interpretation of Chen’s graphs, an algorithm was developed for automatically identifying periods and causes of watering out in wells. The results of analytical calculations were verified on the actual results of field geophysical surveys.

Results. Using this technique, the fund was reviewed at 10 fields and 57 interventions were approved, which are aimed at reducing inefficient injection and limiting unproductive recovery.

Conclusions. The results obtained confirm that the developed integrated approach allows for an express assessment of well interference, determining the causes of watering out, optimizing the water injection system and better planning geological and technical interventions and field geophysical surveys on the base wells within a limited set of initial data.

LLC Sakhalin Energy, the operator of the Sakhalin-2 project, is developing the Piltun-Astokhskoye and Lunskoye oil and gas condensate fields. Ensuring the safe operation of hazardous production facilities remains an absolute priority at all stages of field development. A special place is occupied by the study of the processes and state of injection zones during the operation of injection and absorbing wells. This article is devoted to one of the elements of a comprehensive monitoring program, namely, 4D seismic monitoring of the near-wellbore space based on diffracted waves.

The fracture zone is a source of diffraction, so this technology is an important source of information about the depth, geometry and current state of the absorbing horizon.

Target. The main purpose of the work is to monitor the integrity of fluid seals, assess the risks associated with the operation of absorption and injection wells, as well as prevent complications when drilling adjacent wells. For this purpose, a method for 4D seismic monitoring of the near-wellbore space based on diffracted waves has been developed and implemented.

Materials and methods. Fractured formation zones generate diffracted waves that can be used to localize and geometrize the subsurface space, in particular, the areas of fracture development that form after fluid is injected into the well. The proposed method is based on the analysis of the 4D diffraction component of the wave field (the difference in the diffraction component between the base and monitor surveys). The calculation of the difference allows eliminating geological heterogeneities that have remained unchanged over time and highlighting the changes resulting from the exploitation of the field. This allows diffracted waves to be used directly, greatly improving the resolution of 4D data.

Results. The method for localizing the 4D diffraction component of the wave field was successfully implemented on the data of the Piltun-Astokhskoye oil and gas condensate field, which is being developed by Sakhalin Energy LLC.

Conclusion. The results obtained showed the high efficiency of this technology for the localization of fractured zones caused by injection into absorbing wells, as well as the confirmation by well logging data.

Purpose. Testing the methodology for planning and implementing the massive injection of flow-deflecting compositions on oil deposits and to evaluate the technological effectiveness of compositions with different rheological characteristics.

Materials and methods. The method of massive injection with flow-deflecting compositions is an impact on an oil deposit, including regulation — reducing the permeability of the reservoir water supply channels through injection wells by pumping a fringe of reagents that provide in situ flow-deflection.

Results. The results of the application of the technique of carrying out a massive impact of flowdeflection compounds at the deposit of Western Siberia are considered. The effectiveness of the compositions of flowdeflection technologies after the application of the method of carrying out a massive impact of flowdeflection compositions at the field of Western Siberia is evaluated. As a result realization of the method of massive injection with flow-deflecting compounds, stabilization is observed, and then an increase in the specific efficiency of the event (an increase in the specific efficiency from 576 to 702 tonne oil/treatment).

Conclusion. The maximum efficiency was shown by the emulsion and polymer-dispersed technologies. The synergistic effect of the implementation of polymer-dispersed compositions (polymer-dispersed) and the methods of conducting method of massive injection with flow-deflecting compounds showed stabilization, and then an increase in the specific efficiency of polymer-dispersed compositions up to 667 tonne oil/treatment.

Background. The basic method for determining the minimum mixing pressure (MMP) of oil and gas is to conduct an experiment on the displacement of oil by gas in a slim-tube. The result of the experiment is a set of dependencies of the displacement coefficient on the pumped pore volume of gas at different pressures. In order to correctly predict the mixing mode in reservoir conditions, it is necessary to adapt the numerical model to the experimental results.

Aim. The aim of the work is to determine the optimal approaches to modeling an experiment on oil displacement by gas in a slim-tube and a set of data necessary to achieve high accuracy of adaptation.

Materials and methods. Materials: results of experiments on oil displacement by gas in a slim-tube. Methods: numerical simulation using hydrodynamic simulators Eclipse 300 and Eclipse 100.

Results. The Todd–Longstaff model of miscible displacement shows the best convergence with experimental data under the modes of immiscible displacement and full miscibility. The use of this model to perform predictive calculations is advisable under the condition of complete miscibility of oil and gas in the reservoir. A more correct approach to adaptation is based on the modification of the functions of Kro, Krg, Scr from interfacial tension when using a composite model. In addition to the data of standard studies, in this case, it is necessary to use the results of the VIT test.

Conclusion. The paper considers options for adapting the results of laboratory experiments on the displacement of oil by gas in a slim-tube, based on the use of the black oil model and the composite model. It is shown that the adaptation option based on the modification of the Kro, Krg, Scr functions from interfacial tension makes it possible to achieve the most accurate coincidence of the calculated data with the actual ones. At the same time, in order to configure the PVT model of reservoir fluids, the data of typical studies of reservoir fluids must be supplemented with the results of VIT tests. The limits of applicability of the Todd–Longstaff model are established.

The task of interpolating missing data is important for integrated asset modeling, since the accuracy and reliability of modeling directly depend on the quality of the input data. If the model is missing some data, then this may lead to the impossibility of modeling for this time step. Thus, the problem of interpolation of missing data is important and its solution improves the accuracy and reliability of forecasts.

Aim. The aim of the work is to improve the quality of data for integrated asset modeling (IMA).

Materials and methods. The data from the technological regime of wells, necessary for well modeling within the framework of IMA, are considered as initial data. The table view data contains gaps (missed values), which reduces the amount of data available for modeling.

Results. The paper shows a method for filling gaps with machine learning algorithms on the example of a real field. Missing GOR readings for many dates were predicted by machine learning models.

Conclusions. As a result of the work, an algorithm for interpolating data was proposed to identify one case of infection. This step can increase the amount of data without gaps and significantly improve the quality of the models. In this problem, we were able to increase the amount of data for training models by 98 % in this way, which meets the requirements for the maximum work model by an average of 41 %.

The first industrial revolution happened after the introduction of mechanization in production. The conveyor assembly became the symbol of the second one. The third was held under the slogan of shifting the center of value-added formation from production to sales and design. The fourth industrial Revolution is associated with rapidly developing technologies. Today we can confidently talk about technologies that will change the world in 5–10 years. The old paradigm of oil and gas field development systems, which prevailed over the past century, was based on maximizing the costs of their production processes. The new paradigm is a new concept of values, problem-setting models and their technical solutions aimed at the dynamic development and growth of the company’s capitalization in real time.

Purpose. The main technological challenge is to carry out work on wells with abnormally high reservoir pressure without jamming. Search for solutions to new approaches and breakthrough technologies in the field of routine and major well repairs.

Materials and methods. Now, various technological solutions have been tested and approaches to each type of wells have been identified that allow regulating the technological process. However, working with abnormally high reservoir pressures requires high-tech methods. Silencing of wells is the first preparatory stage before the start of the “life” cycle of a well or already in the production process before scheduled repairs, and one of the most expensive cost items in view of the features of the productive horizon — abnormally high reservoir pressures. In this article, the material on a promising mobile installation for repairing wells under pressure, without jamming, is proposed for consideration.

Results. The proposed method of well repair will reduce oil losses during the preparation of wells for cattle, prevent the destruction of the production column as a result of a long-term presence of a faulty well under pressure, reduce the cost of repairs, achieve the design displacement coverage factor by reducing the number of emergency fund wells in liquidation, as well as reduce the number of HSE (health and safety executive) incidents, reduce the risks of gas and oil production.

Conclusion. Thus, the new high-tech mobile installation Snubbing Unit will significantly reduce the cost of silencing wells and will take the current and major repairs of oil and gas wells to a new level.

Introduction. This article is a generalization of the research and field work, devoted to various aspects of the use of systems for removing filtration crusts of drilling fluids.

Purpose. The article shows the main problematic points and indicates the way to overcome them in order to maximize the technological and economic effect of the use of breaker systems in the hydrocarbon deposits. The work on this article became possible thanks to the coordinated actions of competent specialists from a number of Rosneft Oil Company subsidiaries, who managed to combine engineering approaches of world practices, as well as the Company’s own developments and methodologies.

Materials and methods. The paper considers systems for removing filtration crusts of drilling fluids of various chemical nature.

Results. Based on the conducted laboratory studies and field work, it is shown that the use of systems for removing filtration crusts of drilling fluids may not give the expected efficiency in terms of achieving the potential productivity of wells. This circumstance can be caused by various factors, ranging from the physico-chemical properties of reservoir fluids and process fluids and ending with the peculiarities of the use of filtration crusts removal technology. To maximize the effect of the use of breaker systems and eliminate uncertainties in the choice of technology, it is recommended to select process fluids for each specific development object before carrying out work, as well as to assess the readiness of the bush site for the replacement procedure from drilling mud to a breaker composition, while comparing similar technologies from different manufacturers according to unified laboratory tests fixed in the relevant regulations.

Conclusion. A key factor in achieving technological and economic efficiency will be the use of factor analysis to identify the true potential productivity of new wells for comparison with the actual indicators of new wells being put into development. At the same time, it is obvious that the use of bracket systems for horizontal wells without hydraulic fracturing is a powerful tool for approximating actual well productivity indicators to potential ones. This is possible thanks to the coordinated actions of groups of specialists from related fields: drillers, geologists and technologists. An important step towards the systematization of this process is the creation of regulations that comprehensively disclose the methodology for achieving the effectiveness of the use of breaker systems in hydrocarbon production fields.

Background. Simulation has become an integral part of supply chain management. Oil companies use simulation tools from time to time when designing supply chains.

Aim. To provide examples of the possibility and effectiveness of using simulation in planning oil logistics. The article includes a theoretical analysis of the possibility of using simulation and practical review of the effectiveness of using simulation in solving logistic problems in the oil industry.

Methods. The research methodology represents an analysis of publication activity in Scopus, WoS.

Results. As a result, it is possible to achieve a solution to any problems related to building supply chains in the oil industry.

Conclusion. As a result of the study, it is possible to state that the modeling of logistics processes in the oil industry can be successfully implemented using simulation. This is confirmed by both theoretical studies and practical developments. The undoubted advantage of using simulation, in this case, is the ability to build a model in 3D, before actually investing in production factors (terminals, vehicles, etc.). At the same time, using simulation in solving problems in oil logistics is the exception rather than the rule. It is important to expand the scope and frequency of its application in order to save money and improve the quality of decision-making.