Seismic prospecting for oil and gas exploration and development is limited by seismic data resolution. Improving the accuracy of quantitative interpretation of seismic data in thin layers, thereby identifying effective reservoirs and delineating favorable areas, can be a key factor for successful exploration and development. Historically, the limit of seismic resolution is usually assumed to be about 1/4 wavelength of the dominant frequency of the data in the formation of interest. Constrained seismic reflectivity inversion can resolve thinner layers than this assumed limit. This leads to a series of highresolution quantitative interpretation methods and techniques have been developed. Case studies in carbonates, clastic, and unconventional reservoirs indicate that the application of quantitative interpretation techniques such as high-resolution seismic frequency and phase attribute analysis can resolve and allow/or allow quantitative estimation of rock and fluid properties in such seismically thin layers. Band recovery using high resolution seismic processing technology can greatly improve the ability to recognize geological details such as thin layers, faults, and karst caves. Multiscale fault detection technology can effectively detect small-scale faults in addition to more readily recognized large-scale faults. Based on traditional seismic amplitude information, high-resolution spectral decomposition and phase decomposition technology expands seismic attribute analysis to the frequency and phase dimensions, boosting the interpretable geological information content of the seismic data including subsurface geological characteristics and hydrocarbon potential and thereby improving the reliability of seismic interpretation. These technologies, based on high-resolution quantitative interpretation techniques, make the identification of effective reservoirs more efficient and accurate.

The purpose of the present research is to analyze the geofluid dynamic concept of oil and gas formation. The research uses the author's data on the structure, composition and thickness of multi-aged oil and gas complexes of the Siberian platform (Russia). The oil and gas complexes identified as a result of the integrated geological, geochemical and geophysical studies carried out under oil and gas geological zoning and operational work are presented as a material expression of geofluid dynamic systems. Any geofluid dynamic system includes hydrocarbon generation centers, oil and gas migration routes, types of reservoirs and traps, lithological composition of reservoir rocks and reservoir cap rocks Also it is controlled by a favorable combination of their appearance in geological time and space. An ordinary fluid dynamic system is presented by hydrocarbon solutions generated by oil and gas generation centers, which are examples of a trivial defluidization of oil and gas source rocks of a sedimentary basin. This study allowed to be the first who has identified the elements of multi-age geofluid dynamic systems, presented their material expression in the form of multi-age oil and gas bearing complexes as well as analyzed the composition of hydrocarbons on the example of individual deposits of variousoil and gas-bearing areas. Besides, possible generation centers of hydrocarbon fluids and ways of their migration were investigated. Oil fields of different ages of the oil and gas bearing provinces of the Siberian Platform feature different composition and density, whereas according to numerous available data, they belong to a single genetic type, which is characterized by the predominance of methane hydrocarbons.

The geological section of Eastern and Western Siberia (Russia) is a very complicated object for seismic exploration. The research presented in the article is aimed at studying a petrophysical relation between electrical resistivity and P-wave velocity, as a basis for predicting the velocity model of the upper part of the section based on TEM sounding. Having performed a numerical modeling of petrophysical function, the authors calculated the dependency curves of electrical resistivity on the P-wave velocity. The obtained results of mathematical modeling and field experiments have proved the effectiveness of the proposed methodology as it increases the accuracy of geological model construction and enhances prediction reliability. Based on the dependences obtained, conclusions were drawn about the geological conditions favorable for a steady transition of section geoelectric characteristics to the velocity ones. The proposed technology is shown to provide a reliable reconstruction of the velocity model of the upper part of the section. The use of the developed methodology allows to improve the quality of seismic data processing and increase the accuracy of geological section boundary mapping at minimum cost based on the nature of the problem under investigation.

The purpose of the research is to study and analyze the environmental condition of small streams and reservoirs in the southwestern part of the Altai Territory (Russia), which were previously exposed to radiation as a result of nuclear tests at the Semipalatinsk test site. Conducting the research, the authors obtained the results of studying the content of artificial and natural radionuclides in the bottom sediments of the water bodies under investigation. Sampling of bottom sediments and their analytical studies were carried out in 2020–2022. The sampling involved measurements of the dose rate of bottom sediment gamma radiation. Having dried and ground the samples, the authors measured the flux density of alpha and beta particles from the surface. Laboratory studies of the samples were carried out using highly sensitive analytical equipment including an ORTEC GEM25P4-70 gamma spectrometer, an Alpha Analyst A1200-32AM CANBERRA alpha spectrometer, and a TRI-CARB 3110TR PerkinElmer beta spectrometer. The activities of natural radionuclides (potassium-40, thorium-232, radium-226) and artificial radionuclides (americium-241, plutonium-239+240, cesium-137 and strontium-90) were identified in the bottom sediments. It was determined that the radiation parameters of bottom sediments of water bodies in the southwestern part of the Altai Territory do not exceed the standard level, and the remains of traces of nuclear tests that took place at the test site are not found in the studied water bodies today.

The purpose of the study is a geoecological assessment of the effect of groundwater flowing from geothermal wells through an energetically saturated coolant with its mineral component on natural and natural-economic components as well as on the structure of the entire enclosing landscape for the case of 11-T Gunyushki well of the Chechen Republic (Russia). The impact of the mineralized waters outflowing from geothermal wells on natural and natural-economic components and on the whole structure of the entire enclosing landscape is a challenging environmental problem for all oil and gas regions of Russia. Long-term outflow of thermal water from the well under consideration resulted in landscape trans-formation and suppression of the vegetation cover. Moreover, a stable source of pollution was formed in the place where untreated water from hand-crafted balneological facilities (baths, showers) was discharged that caused a radical restructuring of plant communities. The conducted research is based on the field data obtained by a team of authors on landscape mapping. Interpretation of high-resolution satellite images has shown the dynamics of landscape changes under the influence of thermal waters. The authors took water and soil samples and questioned local residents, which made it possible to adjust the scale and possibilities of using these waters. The research performed allowed to develop a physical-geographical profile, create a landscape map of the area affected by a geothermal well and an index map of the geoecological zoning of the area under investigation as well as identify the main types of the most transformed landscapes resulting from the combined impact of several anthropogenic factors (humidification and impact on the soil and vegetation cover). Conducted study has shown that more than 120 hectares of fertile lands were withdrawn from agriculture due to the anthropo-genic impact. The analysis of the index map of geoecological zoning demonstrates that 79 % of the territory is located in the zone of a weak indirect environmental impact, 7.14 % – in the zone of a strong indirect environmental impact, 13.5 % – in the zone of a strong direct environmental impact. The latter, requires reclamation in order to restore landscapes, since it undergoes desertification. Having performed a number of chemical analyses of water, the authors gave recommendations for the further use of thermal waters in the economy of the Groznensky region. 

The purpose of the article is to study the influence features of polar-oriented slopes on the near-surface energy and hydrothermal balance in the seasonal cryolithozone. The authors carried out a complex of field observations including measurement of air and underlying surface temperature, soil moisture, solar radiation and wind speed at the hydrological stations of Songling (southern slope) and Luoguhe (northern slope) in the northeast of the Great Xing'an Mountain (China). The analysis of the data obtained allowed to conclude that, on the one hand, the long-term influence of the thermal balance components causes significant differences in the soil structure and properties on differently oriented slopes. The number of daily freeze-thaw soil cycles on the southern slope (100 cycles) significantly exceeds the ones on the northern slope (56 cycles). The soil on the southern soil is 3 °C warmer than that on the northern slope, and its humidity in the area of the Songling hydrological station is lower than that at the Luoguhe station. On the other hand, differences in soil properties control the energy exchange between the atmosphere and the earth's surface, this means that the incoming short-wave solar radiation and heat flux into the soil on the southern slope is greater than on the northern one. Therefore, slope orientation is one of the significant environmental factors affecting the influx of solar energy, temperature and humidity of the soils in the northeastern Great Xing'an Mountain. It also has a decisive role for the spatial distribution and evolution of seasonal permafrost in the region and, accordingly, affects the stability and safety of engineering structures. The performed research is important for understanding the relationship between climate and frozen soil in the mountainous areas with seasonal cryolithozone as well as for optimization of boundary conditions when modeling rock freeze-thaw processes.

The purpose of the study is to improve the efficiency of directional drilling using continuous whipstocks in difficult mining and geological conditions. The research involves the description of mining and geological conditions featuring decreased efficiency of continuous whipstock operation as well as the reasons why the decrease is observed. It should be noted that significant problems arise when using the milling-type continuous whipstocks for sidetracking in hard rocks from the plug back total depths of cement mixtures and well deviations in the intervals of normal face weakened rocks. In this case, there is a decrease in deviation accuracy, due to the increased sinking speed that prevents curvature accumulation and which is difficult to control by the drilling mode parameters. Another problem that decreases the well deviation accuracy when using milling-type whipstocks in hard rocks is the deviation of the drift angle build up plane due to the disorienting force that occurs during milling of the borehole wall. The study briefly dwells upon the existing technologies and engineering means, the use of which is aimed at improving the whipstock performance in complex mining and geological conditions, including through the use of bits with a special design. The author has proposed and patented a series of new technical means (bits) and technological solutions that effectively deal with the drop in the performance of continuous whipstocks in the well deviated in hard rocks. Moreover, the developed means took into account the shortcomings of current technical equipment.

The purpose of the presented research is to study the possibility of obtaining an additional coal product and ironcontaining concentrate from the sludge of a coal hydraulic dump. The research involved the study of the material composition of the initial sludge and technological tests. Material composition was examined using chemical, granulometric and mineralogical analyzes, the technological tests were conducted according to the gravitational-magnetic enrichment scheme. A spiral separator was used as the main enrichment equipment. Finishing operation was performed by the method of wet magnetic separation. Having studied the material composition, we determined that the initial sludge of the hydraulic dump is represented by 44.7 % of black coal and 43.32 % of brown coal. The bulk of hard coal is distributed in the size range of -2+0.25 mm and makes 51.15 %, brown coal is distributed in the size range of -2+0.25 mm in the amount of 13.32 %. The material is predominantly represented by a particle size of less than 0.25 mm with a high ash content in it. A coal concentrate with the ash content of 14.4 % was obtained as a result of technological tests. This product corresponds to the brand LFF (long-flaming fine). An iron-containing concentrate with the iron mass fraction of 64.7 % can be used in the metallurgical industry or in heavy-medium separation for coal enrichment. The study illustrates the possibility of obtaining high-quality secondary raw materials without additional mining costs using environmentally friendly technology.

The purpose of the study is investigate the possibility to obtain liquid concentration products (iron-containing and coal-containing concentrates) from the material of mature coal washing tailings. The study of the material composition of the original mature tailings was carried out using mineralogical, granulometric and chemical analyses. Technological tests were conducted according to the gravitational-magnetic concentration scheme. The spiral separator was chosen to be the main concentration equipment. Upgrading operation involved the use of wet magnetic separation. As a result, rough gravity concentrate with a mass fraction of total iron of 25.3 % was obtained. The product yield was 29.62 % with 53.15 % extraction of a valuable component into it. The output of the obtained coal-containing concentrate was 70.38 %, its ash content equaled 31.7 %. Having upgraded the primary gravity concentrate with the use of the wet magnetic separation method we obtained an iron-containing concentrate. The product yield was 0.44 % with 1.97 % extraction of a valuable component into it. The mass fraction of total iron was 63.29 %. Therefore, the article has demonstrated the potential possibility for mature tailings of coal cleaning to be involved in the processing with the production of marketable products such as iron-containing concentrate and secondary fuel in the form of coal concentrate using environmentally friendly technology, at low energy costs and without additional production costs.

The purpose of the study is to collect data and analyze modern development trends of gravity concentration technologies and equipment for coal sludge enrichment. Conducted generalization and analysis of scientific and technical information allowed to state that some attempts have been made recently to enrich coal slimes using mainly gravity concentration methods. Each of these methods involves a number of processes based on general physical and physicochemical properties serving the criteria for material separation as well as on the differently applied additional separating forces and machinery and apparatus designs. The latter include heavy-media cyclones, spiral separators, hydrosizers, concentration tables and wash boxes. The author considers the operation principle of the listed gravity equipment, demonstrates the advantages and disadvantages of each of the apparatuses. The data given indicate that, modern gravity equipment used for coal sludge enrichment features satisfactory indicators of the average probable deviation. To identify the rational topology of concentration diagrams for a particular object, the most optimal type of gravity concentration equipment or its combination is selected depending on the characteristics of the material composition. The analysis of data has shown that the most promising, highly efficient, effective, environmentally friendly and resource-saving gravity concentration method is spiral separation.

The purpose of the study is to analyze the current state of the problem concerning the concentration technology of wash house coal sludge, comparison of the results of sludge dump coal processing on various types of processing equipment as well as formulation of recommendations for spiral separation method application for coal sludge enrichment. The main research methods include generalization and analysis of scientific and technical information, study of the results of technological tests on spiral separation. The problem of sludge concentration is relevant due to the increase in the content of fine classes in mined coal and, consequently, in coal sludge. In real practice most of the sludge is fuel for energy. Having analyzed the experimental part of the research, the authors established the efficiency of coal and rock fraction separation using the technology of coal sludge spiral separation. The need for preliminary classification of the source material before spiral separation is determined. It is found out that spiral sludge separators have a number of technological advantages as compared to spiral mineral separators, due to a wider range of enriched material fineness. The analysis of the performed tests made it possible to establish the application prospects of the spiral separation technology in coal sludge processing. The recommendations are given on the use of spiral separators manufactured by the Research and Production Company Spirit, LLC for the enrichment of sludge products including tailings, dump sludge of the work site of the Wash House of the Branch Open Pit Cheremkhovugol of Vostsibugol Company, LLC.