The article presents the results of a study of the physical and mechanical properties of a biopolymer gravel composite made on the basis of polylactide (PLA) and natural gravel. The developed composite is intended for filtration elements of hydrogeological wells. The biopolymer-gravel composite was tested for compressive strength. The results showed that the biopolymer gravel composite is characterized by sufficient mechanical strength and resistance to the effects of the aquatic environment, which confirms the feasibility of its use as an environmentally safe material for filtration elements of hydrogeological wells. The obtained data can be used for further optimization of the composition of the composite material and the development of new biopolymer block gravel filters of hydrogeological wells.

Abstract. Establishment of geophysical criteria for forecasting promising areas for rare metal manifestations within the Akmay-Katpar ore zone. To achieve this goal, the mineralogical composition of the ore-containing medium of the Akmaya deposit was studied, and their changes due to the functioning of hydrothermal solutions, leading to changes in the petro physical characteristics of the ore deposition medium. At the same time, three-dimensional models of the deposit built in the MicroMine program were used and analyzed, as well as geophysical cartographic and geological materials for this deposit. We considered the mineralogical composition of hydrothermally altered and unchanged rocks of the deposit in question (hornfels, skarns), as well as their density and magnetic properties. The mineralogical composition and their petrophysical characteristics formed the basis for the analysis of geophysical anomalies associated with hydrothermally altered rocks of the Akmaya deposit. The results obtained allowed: 1) explain the nature of the geophysical anomalies created by zones of hydrothermally altered rocks based on the analysis of their mineralogical composition with petrophysical 129 ISSN 2224-5278 1. 2024 characteristics; 2) outline the ore stock and the area of distribution of the main orebearing veins and veins based on the analysis of magnetic exploration data. The practical significance lies in the use of geophysical criteria for predicting the areas of hydrothermally altered cities as a prospecting sign of the discovery of ore deposits.

Purpose. To identify prospective areas within the Northern Katpar deposit based on the interpretation of borehole geophysical survey results and the analysis of spatial geological models. Methods. The set of borehole geophysical methods included gamma-ray logging (GR), inclinometry (IN), X-ray radiometric logging (XRL), thermometry, caliper logging, and resistivity logging (RES). In addition, spatial modeling methods were applied using Micromine software to construct 3D and 2D models of ore bodies. Findings. The analysis confirmed previously identified ore bodies and intersections based on the 2018 drilling data, with some clarifications. For the first time, a new ore intersection has been discovered within the loose sediments of the weathering crust between 42 and 47 profiles, not reflected in earlier geological cross-sections. Additional prospective zones with tungsten trioxide (WO3) content ranging from 0.2 to 0.5% were also identified. Originality. For the first time, the potential existence of ore bodies in the upper part of the section within the weathering crust has been substantiated through the integrated interpretation of geophysical data and block modeling that opens new opportunities for forecasting and resource assessment of the deposit. Practical implications. The proposed methodology for interpreting borehole geophysical data in combination with 3D modeling can be applied in prospecting and resource assessment of other tungsten-bearing deposits.

The article describes the results of calculations of Euler’s 3D deconvolution for geodensity and geomagnetic models of Northern Ustyurt, which, in the first approximation, allow estimating the occurrence depth of gravity and magnetic source bodies. In the density model, the main gravity-disturbing boundary is the zone of transition from Cretaceous to Jurassic sediments. In the geomagnetic field, the upper edge of magnetic source bodies, presumably, is confined to Permian-Triassic volcanogenic sedimentary deposits. It is recommended to consider these results when planning and carrying out geological prospecting works. © 2017, National Academy of Sciences of the Republic of Kazakhstan. All rights reserved.

Актуальность исследования обусловлена необходимостью увеличения ресурсной базы Республики Казахстан для открытия новых месторождений нефти и газа в Северо-Устюртском регионе. Основной целью исследования является определение соотношения структурных элементов основных геоструктур Северо-Устюртского региона. Объект: поверхность фундамента и палеозойская, доюрская поверхность и кратерное основание Северо-Устюртского региона. Методы: преобразование в цифровой формат серии структурных карт: по поверхности фундамента, палеозойской, доюрской поверхности и кратерному основанию Северо-Устюртского региона с использованием программных средств Didger, Surfer, ArcGIS, Geosoft; количественный корреляционный анализ основных геологических границ в программном комплексе COSCAD 3D. Результаты. Авторы выделили три группы геоструктур в Устюртском регионе по характеру соотношения поверхности фундамента и палеозоя, дна юрских и меловых отложений. К первой группе относятся подвижные складчатые системы и «подвижные углы», в которых коэффициенты корреляции слабы, либо вообще не проявляются (Южно-Эмбинское поднятие, Арало-Кызылкумский свод, Центрально-Устюртская дислокационная система, горный Мангышлак). Вторую группу образуют внутренние подвижные группировки, выделяемые в виде крупных положительных структур, характеризующихся чрезвычайно высокими значениями коэффициентов корреляции по поверхности фундамента и палеозою, дну юрских и меловых отложений (Бузачинское поднятие, Актумсукская возвышенность, Куаниш-Коскалинский свод, Байчагыр-Яркимбайская возвышенность). Третья группа геоструктур образована тектоническими элементами внутренних районов Северо-Устюртского региона (Северо-Устюртские депрессионные системы, Челкарская и Барсакельмесская впадины), характеризующимися длительным и унаследованным опусканием в фанерозое и высокой корреляцией поверхности фундамента и палеозоя, дна юрских и меловых отложений. © Издательство Томского политехнического университета, 2019. Все права защищены.

The rapidly developing mining industry in the territory of Central Kazakhstan leads to emergence of near the areas of active mining of tangible earthquakes of technogenic genesis, which creates difficulties in their operation. Displays of irreversible changes in the state of rock mass with the development of new structures, active faults. The features of the formation of potentially dangerous areas of the occurrence of seismicity. We have considered one of the major factors the features of modern tectonics and modern geodynamics of ore-industrial facilities in Central Kazakhstan. The shield of the young platform is a wide area protrusion of the basement of the epigercina platform, adjoining mountain-building area in the southeast, and in all other directions sinking under Mesozoic-Cenozoic deposits. Geomorphologically it is a vault, complicated by increases of a higher order with contrastingly expressed tectonic layers. The seismic events were concentrated on the boundaries of the active of passive blocks of the earth's crust of Neogene-Quaternary tectonic activity of the Kazakh shield. The active impact on the geological environment of industrial explosions will change the geodynamical activity and as consequence occurring technogenic earthquakes in the fields of central Kazakhstan. © 2020 Published under licence by IOP Publishing Ltd.

According to the results of research in the Ustyurt region by the nature of correlation the surface of the basement and paleozoic, the bottom of the Jurassic and Cretaceous sediments are divided into three groups of geostructures. The first group of geostructures included mobile fold systems and “mobile corners”, in which the correlation coefficients are weak, either do not appear at all (South Emba uplift, Aral-Kyzylkum arch, Central Ustyurt dislocation system, Mountain Mangyshlak). Second group forms internal mobile elements, isolated as large positive structures characterized by extremely high values of correlation coefficients by surface of the basement and paleozoic, the bottom of the Jurassic and Cretaceous sediments, (Buzachi uplift, Aktumsuk high, Kuanish-Koskala arch, Baychagyr-Yarkimbay high). The third group of geostructures forms tectonic elements of the inner areas of the North Ustyurt region (North Ustyurt depression systems, Chelkar and Barsakelmess depressions), characterized by prolonged and inherited subsidence in the Phanerozoic and high correlation surface of the basement and Paleozoic, the bottom of the Jurassic and Cretaceous sediments. © National Academy of Sciences of the Republic of Kazakhstan, 2020.

The results of interpretation of aeromagnetic survey data in the southern part of the Ustyurt region in order to identify zones and areas of rocks heterogeneous in terms of magnetic properties are discussed in this article. An attempt has been made to tie up the depth and nature of the propagation of the magnetoactive layer with areas potentially productive for the detection of hydrocarbons accumulations (HC). With these purposes there were calculated such reduced-to-the-pole transforms of the anomalous magnetic field: Vertical and horizontal derivatives, analytic signal, tilt derivative (TDR) of this field, high-and low- frequency components, tracing of axes of magnetic anomalies ΔTa, and position of 3d modeling of Euler’s points. The occurrence of a network of faults indicates the abrupt changes in the sign and direction of ΔTa anomalies, the presence of linear zones of high values of the magnetic field gradient, displacements of anomalies in plan and rectilinear ledges in the relief. Three tectonic elements, the Central Ustyurt dislocation system, the Shakhtakhtin step, and the Assakeaudan depression are distinguished by the character of the transforms of the geomagnetic field, and, consequently, by the depth of occurrence and the scale of propagation of magnetic rocks. The Shakhpakhty step is first of all recommended for setting up exploration in order to study the geological structure and oil and gas potential in more detail by the method of geological analogies and taking into account the available geological and geophysical data. © National Academy of Sciences of the Republic of Kazakhstan, 2021.

Thearticle analyzesthe results of research of suffosion and karst processes in the Karachaganak oil-gas-condensate field through high-precision gravity surveyingand electrical prospecting, satellite geodesy and laboratory soil research. The efficiency of the complex methods was evaluated. The criteria of detection in geophysical fields, petrophysical features and forms of changes in the surface relief of suffusion and karst light holeswith the selection of areas of intensive development of the process and the definition of the area with the initial stage of deformations of the near-surface layers were revealed. It was found that the suffusion light holes are well distinguished by specific (moderate) values of electrical resistance, negative local anomalies of the gravitationalfieldand positive forms of of the surface relief. The results of the studies indicate that suffosion processes have developed at a depth of 2-12 m from the ground surface. © 2021, National Academy of Sciences of the Republic of Kazakhstan. All rights reserved.

The article discusses the results of the interpretation of gravity survey data in the southern part of the Ustyurt region in order to identify zones and areas heterogeneous in terms of the density properties of rocks. An attempt was made to relate the nature of the distribution anomalous gravity field with areas potentially productive for the discovery of hydrocarbon (HC) accumulations. To this end, the following transforms were calculated: modules of vertical and horizontal potentially productive of Bouguer anomaly, local gravity anomaly (recalculated in the upper half-space at a height of 2.5 km), anisotropy transform, the accent of maximum gravity anomaly and Euler points. The distribution of Euler points clearly demonstrates different depths of bedding of gravitational-disturbing boundaries in the crust of the Central Ustyurt dislocation system, the Shakhtakhty step and the Assakeaudan depression. The depths of the latter are observed to coincide with the reflecting boundaries according to common depth point (CDP)-2D seismic data (surfaces of pre-Jurassic rock complexes, basement, and boundaries in the sedimentary cover). A high total thickness of the sedimentary cover and pre-Jurassic rock complexes of the Shakhpakhty step has been established. This statement is confirmed by the airborne gamma-ray spectrometer (radiometric) data, processed and interpreted by the thorium normalization method, as well as the results of interpretation and modeling of the aeromagnetic survey data. The results of the integrated interpretation of gravity and magnetic field transforms, airborne gamma spectrometry and seismic CDP-2D data unambiguously indicate the prospects of oil-and-gas bearing of the local structures at the Shakhpakhty step with due regard for favorable historicalgeological, structural and lithofacies factors. © 2022, National Academy of Sciences of the Republic of Kazakhstan. All rights reserved.