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Geoinformatics: Theoretical and Applied Aspects 2020
- Conference date: May 11-14, 2020
- Location: Kyiv, Ukraine
- Published: 11 May 2020
81 - 100 of 151 results
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Modeling of pushing processes in anisotropic low permeable Gas reservoirs
By M. V. LubkovSummaryOn the base of combined finite element - difference method, we carried out computer modeling of filtration processes between producing and injection wells in anisotropic low permeable gas reservoirs. The modeling results show that intensity of the filtration processes between producing and injection wells and, respectively the gas production level depends essentially on their location, as in the shear-isotropic so in anisotropic gas reservoirs. Accordingly obtained information for effective exploitation of low permeable shear-isotropic gas reservoirs it is necessary to place the production and injection wells along the major axis of the reservoir anisotropy. In the case of production and injection wells installation in the low permeable anisotropic gas reservoirs, the most effective gas exchange between them will take place when the direction of the increased permeability of the reservoir coincides with the direction of the wells location. Obviously, we can achiev e the best conditions for gas production in anisotropic low permeable gas reservoirs only after systematic analysis and optimal selection of the most important factors of the filtration process in every practical case.
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An Approach for Anomaly Detection in GPR Data using Machine Learning Techniques
Authors M. Ozkan-Okay, R. Samet and S. StirenkoSUMMARYGround Penetrating Radar (GPR) is a geophysical technique that investigates underground structures. GPR data are used to visualize an underground map of search areas. One of the most important problems in the investigation of the underground structure is the correct identification, visualization and interpretation of anomalies in GPR data. To contribute to the solution of this problem, a methodology which consists of four stages is proposed. At the first stage, the original data from the test area are collected and preprocessed, and the synthetic data are produced using original data. In the second stage, features are extracted and the data set is created to apply the machine learning techniques. In the third stage, the data set is analyzed by machine learning techniques to identify the anomalies. At the final stage, the geometry of the anomalies in GPR data is visualized in the 3D environment and visualized anomalies are interpreted. The obtained results showed that the anomalies were detected with 94% accuracy.
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Estimation of low frequency phase velocity dispersion in weak contrast periodic media
Authors Yu. Roganov, A. Stovas and V. RoganovSummaryFormulas for calculating the approximation of the dispersion of vertical slowness and phase velocities of Floquet waves in a periodic horizontally layered medium with anisotropic layers are derived. The accuracy of the calculations is demonstrated on a three-layer periodic medium with orthorhombic layers with different azimuths of symmetry planes.
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Modeling of the riverside groundwater intakes exploitation taking into account of the stream flow changes
Authors S. V. Telyma, O. S. Voloshkina, YU. O. Bereznytska and V. M. EfimenkoSUMMARYPurpose. As known the main part of the groundwater intakes are situated in river valleys where the close interconnection of the surface and groundwaters have a place. At this the part of the exploit resources is providing for account of the river flow reduction. Purpose of the research consists of the systematic and complex analysis of the riverside groundwater intakes work taking into account of the geological and hydrogeological conditions forming of the water resources on the territory Volyno-Podol artesian basin. Methodology. The research methodology consists of the using the methods of numerical modeling for evaluation of the prognosis resources of the groundwater intakes for water supply of Lviv region(Ukraine). Results. A permanently working mathematical model of the geofiltration of the investigated groundwater field has been created for evaluation of the operational groundwater resources for a long-term period which allows to carry out the imitative modeling of project water intakes exploitation in different operating regimes, solving problems of regulating and optimizing water withdrawal under different conditions of water intakes work, the expansion the productivity depending on the economic needs in the region and to solve the problems of the maintenance the quality of the drinking water by predicting the possible pollution and depletion of major aquifers during their operation. The created model of the ground water deposit of the Gorodok area(Lviv region,Ukraine) can be used as a intake-analog when selecting promising sites for the placement of new water intakes that will reduce material resources during their substantiation and construction. Originality. A permanently working mathematical model geofiltration has been created for the assessment of groundwater resources on the basis of a comprehensive analysis of geostructural features and hydrogeological conditions at a given territory. The model allows to consider of the different variants of water intakes operation depending on the technical and economic conditions and the possible increase in water supply needs taking into account of the environmental measures and the impact of water intakes on the environment. Practical significance. As a result of the research the exploit groundwater resources in the water intakes area were wellgrounded determineded which allows to increase the available water supply of the population on this territory for a long-term period and to reduce the load on the operation of existing water intakes thereby regulating the groundwater resources of the given artesian basin.
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Petrophysical determination model of the collector points by the gamma-gamma-density results and gamma-spectrometric methods
Authors Y. M. Femyak, V. V. Fedoriv and R. O. MarynchakSUMMARYAccording to the reservoir rocks research of the productive horizons of the Letnian gas field, it is found that the lowered mineralogical density of the Lower Dasha deposits is associated with the presence of significant content in the rocks of solid organic matter. The paper considers the possibility of increasing the informativeness of the results of the gamma-gamma-density method by using the results of gamma-spectrometric studies of the data of reservoir rocks. As a result of the simulation, a complex petrophysical model was obtained, which makes it possible to more accurately estimate the porosity coefficient of the reservoir rocks by the results of studies by gamma-spectrometric and gamma-gamma-density methods.
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Transformation of a spherically symmetric model of Earth’s mass one-dimensional distribution PREM to a hydrostatic state
Authors M. M. Fys, A. L. Tserklevych and B. B. DzhumanSUMMARYThe condition of the hydrostatic state of the planet is a key in investigation for determining the figure and identify the causes of the heterogeneity of the gravitational field of the planet. Therefore it is important to transform the density distribution of the PREM model to fulfill this condition. Achieving a hydrostatic state is in essence equivalent to determining the minimum of the Earth’s gravitational energy, and its fulfillment is achieved by variations in density. The representation of a piecewise continuous function of density distribution in the PREM model by Legendre polynomials allows us to approximate the potential and energy of ellipsoid . The division (calculation) of energy into layers allows us to analyze the contribution of each of the segments in the total value of energy during the redistribution of matter inside the celestial body. We propose formulas for calculating the potential and energy of bodies with mass distribution in the form of the sum of Legendre polynomials using the additional condition - the minimum of energy. The use of such an algorithm made it possible to transform the spherically symmetric model PREM to a hydrostatically balanced state. The estimation of the density redistribution and the detection of the zones of their greatest change make it possible to optimally harmonize the geometrical characteristics of the planet’s ellipsoid with its gravitational field and to accurately interpret the inhomogeneities of the masses inside the planet.
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Digital field geology
Authors I. M. Bubniak, A. M. Bubniak and O. D. GavrilenkoSUMMARYField geological studies are an important source of information about upper most of crust that is available for direct observations. With the development of modern technologies, traditional methods and approaches are been replaced by modern ones. This paper evaluates the experience of using digital technologies during collection, processing and presentation of geological information from numerous geological site. Field Move and Clino are the most common software today among field researchers. They may be easily installed on tablets and cell phones respectively. The toolkit fully supports the researcher’s work in the field. A significant benefit is the processing of all collected information using digital technologies. Advantage and disadvantages of digital technologies and technical devices are analyzed. The presence on market of alternative software is indicated.
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Anisotropy parameters for monoclinic media
Authors A. Stovas, Y. Roganov and V. RoganovSummaryWe accurately define anisotropic parameters suitable for monoclinic medium with a horizontal symmetry plane.
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A Methodology to Complete and Visualize the GPR Data
Authors R. Samet, M. Ozkan-Okay and O. P. MarkovskyiSUMMARYGround Penetrating Radar (GPR) is a geophysical method that is used for investigating and visualizing the underground structures. The usage of GPR in underground research and applications has been increasing recently because it can detect underground structures quickly and accurately. There are some important factors that affect the success of GPR research and applications. One of the factors is the data collection parameters which are under the control of users and can be adjusted according to the aim of the research. Other factors are the research area properties and the structural states of the underground structures. These properties are out of the control of users. Data can be collected incompletely due to such properties as technical failures, rugged terrains, the presence of obstacles, negatively affected electromagnetic signals, etc. These incomplete data make it difficult to visualize and interpret the underground structure with high accuracy. In this study, a methodology is proposed to complete the missing data and predict and visualize the underground structure closest to the original shape in order to contribute to the solution of this problem.
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Electrometry effective inverse problem solving method
More LessSummaryA new fast inverse problem solving method of multi-probe electrometry of wells is proposed, which allows taking into account the quantitative contribution of measuring each probe to the final result. The algorithm for solving the inverse problem has been developed and implemented in software. It is shown that the proposed approach can also significantly improve the vertical resolution of the method as a whole. An example is given of comparing various results of solving the inverse problem of lateral logging sounding and lateral logging when changing the contribution of the measurement of each probe to the final result. It is concluded that the use of a quick method for solving the minimization of the residual functional combined with the ability to take into account the contribution of each probe of the multi-probe electrometric complex to the final result of solving the inverse problem makes it possible to increase the accuracy of quantitative interpretation. It is also shown how the developed algorithm and the corresponding software created make it possible to increase the accuracy of determining the geoelectric parameters of reservoirs. The results of the work were introduced into the production of a number of commercial geophysical organizations.
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Seismic site effects evaluation of the Yagotin compressor station (Ukraine)
Authors Yu. Semenova and A. KendzeraSummaryA crucial step towards ensuring the seismic resistance of critical facilities and the mitigation of earthquake risks involves the accomplishment of site response studies. The selection of a model of stress-strain state of soil under seismic loads is considered. The paper presents the results of a study of the influence of the sedimentary layer on seismic oscillations on the surface using the example of the territory of the Yagotin compressor station (Ukraine). In the calculations, the equivalent linear ground response analysis to seismic impact was used. The frequency range of the resonant amplification of the soil under the site is determined. The analysis of the influence of the sedimentary layer on the frequency composition of the oscillations of the upper layer is carried out. The study of the site effects allows you to make design decisions that do not allow the frequencies of structures on the site to coincide with the frequencies of the soil amplifying seismic vibrations.
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Lateral logging sounding and lateral logging complex effective inverse problem solving method
More LessSummaryUsing the example of lateral logging sounding the possibility of assessing the influence of the adjacent beds and boundary effects on the real vertical resolution of the inverse problem solution is shown. An example of such solution to the inverse problem of the “BKZ+BK” complex for a real well material in a sedimentary rocks is given. The conclusions are made that: for the correct use of the algorithm for solving the inverse problem, it is necessary to have an estimate of the vertical resolution of the electrometry method as a whole; a real assessment of the influence of boundary effects on the measurement of the apparent resistance of the probes of the complex allows us to evaluate the effectiveness of the method; the use of the proposed residual functional allows us to change the effect of probes of different lengths on the final result and thereby allows to achieve satisfactory accuracy even when studying the geoelectric parameters of formations whose thickness is less than the length of the largest probes of the complex. The results of the work were introduced into the production of a number of commercial geophysical organizations.
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Solving the three-dimensional linear magnetometry problem on GPU
Authors E. N. Akimova, V. E. Misilov and V. O. MiftakhovSUMMARYThe paper is devoted to construction and implementation of the cost-efficient algorithm for solving the three-dimensional problem of finding the vertical component of the magnetic field generated by a rectangular parallelepiped with a variable unidirectional magnetization. The algorithm uses the Toeplitz-block-Toeplitz structure of the matrix of the discretized problem to reduce the amount of calculations and computing time. The algorithm was implemented on GPU using the CUDA technology. A series of numerical experiments were performed to study the efficiency of the parallel algorithm.
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Simulation of Water Filtration in a Geothermal Doublet
Authors M. Yu. Filimonov, E. N. Akimova, V. E. Misilov and N. A. VaganovaSUMMARYThe paper is devoted to modeling an open geothermal system consisting of two wells (production and injection). Geothermal energy is a promising type of renewable energy. A mathematical model of the functioning of such a system is described and parallel algorithms are developed for solving the problem of the distribution of cold water from an injection well in a geothermal reservoir. The results of numerical calculations and analysis of the efficiency of using parallel algorithms are presented.
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The evolution of dilatant inclusion by the analogy with the geometric application of the Ricci flow
Authors V. A. Pyankov and A. L. RublevSUMMARYThe evolution of the dilatant zone from the volume limited by an uneven surface to its transition to the homeomorphic sphere is shown. Using the example of a smooth curve on a Euclidean surface, we demonstrate the dynamics of Ricci flows, the apparatus of which allows you to transform a smooth curve into a homeomorphic circle. On practical examples it is shown that at the intermediate stages of development the surface of the probable dilating inclusion is uneven, and from the analysis of gravitational data it follows that after the completion of the surface formation, the dilatant object becomes spherical and smooth.
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Construction of the Earth’s crust rheological boundaries based on a complex solution of inverse problems of magnetometry and gravimetry
Authors V. A. Pyankov and A. L. RublevSUMMARYAccording to the observed data, we had made a complex interpretation of the magnetic and gravitational fields of the Earth’s crust region of the Middle and Southern Urals. The distribution of magnetization and density is calculated. To solve the structural magnetic inverse problem, a modified iterative local correction method is proposed. In this paper we describe new results of construction of the Earth’s crust magnetic and density models (Pre-Urals, including the dilatant zone).
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Application of frequency-resonance technology of satellite images and photographs processing for the hydrogen accumulations searching
Authors M. Yakymchuk and I. N. KorchaginSUMMARYThe results of experimental studies using mobile methods of frequency-resonance processing and interpretation of Earth remote sensing data (satellite images) and photographs are analyzed. Demonstration studies were conducted at local sites in Azerbaijan, Tatarstan and Latvia with the aim of improving methodological techniques of frequency-resonance methods using in the search and exploration process, as well as exploring the possibility of their use for detecting and localizing hydrogen accumulation sites. Within the examined small zones of visible hydrogen degassing, responses were recorded at resonant frequencies of hydrogen, as well as signals at frequencies of igneous rocks of gabbro and basalts. The experimental work carried out indicates the possibility of frequency-resonance methods using in the search for hydrogen deposits. It can also be assumed that the areas of basalts and gabbros rocks location can be considered priority when prospecting for hydrogen conducting.
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Application of mobile frequency-resonance methods of satellite images and photo images processing for water accumulations searching
Authors M. Yakymchuk and I. N. KorchaginSummaryThe results of additional experimental studies are presented with the aim of studying the possibility of using methods of frequency resonance processing and interpretation of satellite and photo images for the aquifers searching. Investigations of a reconnaissance character were carried out on a mineral water deposit, the territory of a summer cottage, the offshore of the Atlantic coast of the USA, in the areas of lakes and the Aral Sea, as well as in certain regions of longevity. Additional materials have been obtained that testify to the synthesis of water at a depth of 69 km in volcanic complexes of a certain type. A survey of longevity zones in various regions showed that all of them are located within volcanic structures filled with basalts. In these volcanoes, water is synthesized at a depth of 69 km and hydrogen migrates. Hydrogen-enriched water promotes longevity. The results of the developed direct-prospecting methods testing in various regions of the world testify to their efficiency, effectiveness and practical applicability in the search and exploration of aquifers, as well as ore and combustible minerals.
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Exogenic Processes’ Remote Monitoring of Kanivske Reservoir’s Right Bank
Authors O. A. Mykolaenko, P. V. Zhyrnov, O. V. Tomchenko and I. O. PidlisetskaSummaryThe changes’ monitoring results of the exogenic geological processes’ development are presented in this article on the territory of Kanivske Reservoir’s Right Bank, (Trypillya – Rzhyshchiv area) which was made on the ERS basis and topographic survey’s material, cartographic and statistical reports of various geological and hydrological organizations. Gully erosion and landslides have become widely dissemination in the limits of Kanivske Reservoir’s right bank and waterlogging, eutrophication have intensive manifestation within the bounds of low and flat relief of the left bank. Erosion played a major role among exogenic processes before Kanivske reservoirs’ creation and landslides were in its final stages and had an insignificant spreading areal. Reservoir’s construction triggered the groundwater overpressure’s changes and slope abrasive processing that caused the old stabilized landslides’ activization and the formation of new ones. There is a clearly pattern of abrasive, erosion and landslide processes’ activization of the Kanivske reservoir’s coastal territories with the oscillation amplitude of the maximum and minimum soil surface temperature and soil’s freezing depth. It was established that the years with the rainfall patterns during summer and autumn period coincide with the years of the greatest landslides’ activation within the investigation territory.
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A GIS and WUDAPT based mapping of the local climate zones in Ukrainian cities
Authors O. Shevchenko, M. Matviienko and S. SnizhkoSUMMARYThe local climate zones (LCZ) classification system provides urban heat island research framework, as well as can be a basis for the investigation of the urban environment comfort. The data of 12 European (including 5 Ukrainian) cities based on WUDAPT protocol (level 0) were used for the research of LCZs. Data analysis and graphical processing was performed at ArcGis. The most spread local climate zones for the nearly all researched cities are LCZ-5 (open mid-rise) or LCZ-6 (open low-rise). In some cities the most spread local climatic zones are LCZs with trees and plants (in Warsaw LCZ-B covers 27.7 %, in Kyiv LCZ-A covers 32.5 %, in Lviv LCZ-A covers 30.5 %, in Dnipro LCZ-D covers 24.4 %). A case study of Kyiv shown the differences between LCZs within administrative borders of the city and within built-up area (BUA). The local climatic zones with trees and plants (LCZ-A, B and D) cover about 52 % within administrative borders of Kyiv and 24 % in BUA, the LCZs bui lt series cover about 40 % within administrative borders and 65 % in BUA. The most of the built-up area of the city (both cases – administrative borders and BUA) is occupied by LCZ-5, LCZ-6 and LCZ-8.
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