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Monitoring 2019
- Conference date: November 12-15, 2019
- Location: Kyiv, Ukraine
- Published: 12 November 2019
41 - 60 of 110 results
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EVALUATION OF CS-137 CONCENTRATION IN ONE OF THE LOCATION OF FINAL DEPOSITION ACCORDING TO GEOPHYSICAL EXPLORATION
By M. DanylovaSummaryResults of the radioactive contamination measurements by Cesium-137 of a repository are evaluated. Contamination are carry out with hole radiometry near the repository. Vertical curves of exposure dose rate have a mutual feature — an absence of high values at low depths that corresponds to bulk layer of soils and sharp increasing of exposure dose rate in 60–80 cm that reflects an upper level of repository. Complex software MicroShield was used during data processing of gamma-ray log and specific activity of Cesium-137 determination in radioactive waste gatherings. Software functions with a wide range of geometry options give an opportunity to represent the exact conditions in the well. This allows us to increase the resolution of calculations, minimizing the possibility of possible uncertainties and determine radioactive characteristics inside the buried radioactive waste. Furthermore, determination of buried radioactive materials characteristic afford making rational administrative and projective decisions on how to safely eliminate and behave with radioactive waste.
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MAGNETOMINERALOGICAL SUBSTANTIATION OF MAGNETIZATION OF THE ROCKS OF THE LOWER CRUST AND UPPER MANTLE
Authors V. Drukarenko, M. Orlyuk and O. ShestopalovaSummaryRecent researches have been shown that sources of longwavelength geomagnetic anomalies are located at upper mantle depths to which earthquake sources may be associated. Therefore, there is a requirement of magnetomineralogical and physical justification for the possibility of the existence of magnetized rocks at these depths. The main minerals retaining magnetic properties in the lower crust and upper mantle are magnetite, haematite, native α -Fe iron and its alloys. The emergence and transformation of iron minerals and reducing of α -Fe can occur due to the reactions of reducing fluids with different iron compounds and rocks in particular at junction zones of lithospheric plates of different types, rifts, plumes, tectonic-thermal activation, etc. The mantle xenoliths are the main sources of information of mantle magnetization and characterized by pure magnetite inclusions in olivine and pyroxenes. Magnetite is formed due to serpentinization processes in the mantle peridotites. Iron oxides and native iron are potential sources of magnetic anomalies in the mantle. Studies have shown that haematite remains magnetic at depths of transition zone in the mantle in cold or very cold subduction geotherms. α -Fe can be found in the lower crust and upper mantle due to the low oxygen fugacity and the reducing nature of the geochemical environment.
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RADIOECOLOGICAL MONITORING OF LOCAL SOURCES OF EXISTING AND POTENTIAL RADIOACTIVE CONTAMINATION USING GEOINFORMATIONAL SYSTIM
Authors O. Fedchenko, I. Syniavska, N. Levinskova, P. Savkov and V. SavkovaSummaryRadioecological monitoring is a complex information and technical system for observation, research, evaluation and forecasting of the radiation status of the biosphere, areas near NPPs (Nuclear Power Plants) affected by radiation accidents, and potentially hazardous areas (PNT) such as radioactive waste storage facilities, radioactive waste storage facilities (threat of nuclear weapons), nuclear power plants (NPPs), nuclear fuel manufacturing and processing enterprises, nuclear reactors, nuclear power plants at transport facilities. The territory of Ukraine needs a perfect system of radio-ecological monitoring several times more than any European country. Unstable military-political situation, numerous explosions of ammunition arsenals lack of RW repositories that meet international standards. By volume of radioactive waste, Ukraine is ranked II in Europe and IV in the world (3.5 million m3). This is the main reason for the need to constantly control and monitor the state of sources of existing and potential pollution of the territories.
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PETROPHYSICAL MODEL FOR POROSITY DETERMINATION OF COLLECTORS WITH DIFFERENT CONTENT OF CLAY MATERIALS ACCORDING TO THE ACOUSTICAL AND RADIOACTIVE RESEARCHES
Authors D.D. Fedoryshyn, V.V. Fedoriv and R.O. MarynchakSummaryAccording to the results of studies of the geological structure of productive rocks-collectors of perspective horizons of gas deposits of the Precarpathian Strait and the Dnieper-Donetsk basin, it is established that gas-saturated layers are represented by monomictic sandstones and siltstone with different types of cement. The analysis of information from the literature and methodological recommendations for the determination of porosity showed that the clay greatly affects the results of geophysical studies of wells, in particular acoustic and neutron logs. In this work the possibility of taking clay into account when determining the porosity coefficient using the results of gamma logging studies is considered. As a result of the simulation, a new unified petrophysical model for determining the porosity of reservoir rocks with different content of clay material was obtained, according to the well studies of acoustic and gamma logs.
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THE PERSPECTIVES FOR OIL AND GAS CONTENT OF INDIVIDUAL LITHOLOGIC-STRATIGRAPHIC STRATA OF THE RUDAVETS OIL FIELD
Authors D.D. Fedoryshyn, O.M. Trubenko, S.D. Fedoryshyn and R.O. MarynchakSummaryThe results of the complex geophysical researches of wells of separate deposits of the Boryslav-Pokut zone of the Pre-Carpathian strait were reinterpreted, reassessment of oil and gas perspectives of individual paleogene system subdivisions, also missed layers were detected. Such a promising area within the second layer of the structures of the Boryslav-Pokut zone of the Pre-Carpathian strait is the Rudavets oil field.
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CORRELATION AND CLUSTER ANALYSIS OF PRINCIPAL GEOLOGICAL PARAMETERS OF GIANT HYDROCARBON FIELDS
Authors G.N. Gahramanov, N.R. Narimanov, M.S. Babayev, S. Shpyrko and M.T. BabayevaSummaryWe consider the problem of extraction of relevant geological parameters, related to the formation conditions of major hydrocarbon (HC) fields and estimation of their resource potential. The identification of most informative sets of geological parameters and revealing correlation dependencies between them is of crucial importance for HC exploration. Experience has proven, that 10–15 geological parameters have high information impact and can be used to estimate HC potential in most sedimentary basins. These parameters characterize sedimentation conditions, tectonic environment, organic matter transformation, location of the oil and gas accumulation areas etc. Depending on the geological conditions, relations of various nature can exist between these parameters, which can be characterized by pairwise correlation coefficients. We present the pilot study of the pairwise correlation coefficients between the metric subset of these parameters, calculated from data set of major world basins, including Azerbaijan giant fields. Several alternative graphic models are proposed (including trend curves, correlograms, chord diagrams and clustered dendrograms) to visualize the dependencies and to derive conclusions as to the impact of these parameters on the probability assessment of the HC field formation.
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LOCATION OF GAS-SATURATED OBJECTS OF UNCONVENTIONAL TYPES IN THE WELL SECTIONS BY THE WELL-LOGGING DATA
Authors O. Karpenko, V. Mykhailov and I. BaysarovychSummaryOn the basis of authors own experience, it was made an attempt to analyze the possibilities and modern approaches of identifying unconventional reservoirs and to give practical recommendations for assessing their prospects. The issues of practical implementation of interpretative models for determination of TOC content, clay content and porosity in the well sections with the purpose of estimation of shale gas resources are considered. The main criteria and limitations for the allocation of perspective objects in well sections are presented in order to realistically account for shale gas resources and gas of tight reservoir rocks. It is shown that the use of the most commonly used method of Q. Passey is quite effective in calculating the TOC content in terrigenous sections of the Serpukhovian of oil and gas fields of DDD. Typical values of gas saturation coefficients and range of possible porosity values inherent in tight reservoir rocks of the Serpukhovian of the of the South side of the DDC are presented and recommended by the authors.
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PREDICTION OF PERMEABILITY USING PORE NETWORK MODELS CONSTRUCTED FROM THIN SECTION IMAGE OF RESERVOIR ROCK SAMPLE
Authors I. Kurovets, A. Shyra, Y. Shpot, S. Kurovets and V. KurovetsSummaryNetwork models of porous media are a useful tool for predicting transport properties of hydrocarbon reservoir rocks. This work explores the possibility of using a reconstructed three-dimensional pore space model, obtained by means of multi-point statistical modeling based on thin images of reservoir rocks, to construct a bi-regular network model based on truncated octahedral nodes. With this model, it is possible to simulate pore systems with a wider range of pore connectivity, making the proposed model more realistic and flexible than existing cubic-based models. It is shown that using these models it is possible to accurately predict the experimentally measured permeability of the sample.
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THE CHEMICAL COMPOSITION OF THE THORIUM ORTOSILICATES FROM ALBITITES OF THE NOVOOLEKSIIVKA THORIUM-URANIUM OCCURRENCE (UKRAINIAN SHIELD)
Authors I. Mihalchenko, O. Andreev and S. ShnyukovSummaryThe chemical compositions of pneumolithic-hydrothermal Thorium orthosilicates from the albitites of Novooleksiivka occurrence are characterized by admixture of Uranium, Rare Earths elements, Yttrium, and some Phosphorus. Thorites and Uranothorites have been identified in albitites. Ferritorites are epigenetic minerals. The chemical compositions of Thorium orthosilicates from the albitites are characterized by admixture of Uranium, Rare Earths elements, Yttrium, and some Phosphorus, which gives the basis for these minerals due to the decomposition of magmatic Monazites of the original rocks. The spectra of Rare Earth elements of Thorium orthosilicates are not constant, which is a sign of the fractionation of these elements in the processes of pneumolithic-hydrothermal alteration of the original rocks. The signs of the Uranium and Thorium leaching, migration and deposition testify of the existence of conditions of transportation of Uranium in the U4+ uranium oxidation state in the fluid, that generated rocks.
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THE METHOD TO RESEARCH EQUIVALENT SOLUTIONS ZONES FOR INVERSE PROBLEM OF WELL LOGGING ELECTROMETRY
By M. MyrontsovSummaryThe purpose of the research was to create a way to determine the areas of equivalent solutions for inverse problems of well logging electrometry. Method of parameters model relation with values for each sonde was proposed to use for equivalence zone creation. After results of proposed method use for models of typical reservoirs in Dnipro-Donetsk depression, it was concluded about high efficiency of the proposed method.
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INTEGRATED MODELING OF PETROPHYSICAL PARAMETERS TO DETERMINE THE MINERALOGICAL COMPOSITION OF THE CRUST
Authors I. Pap and I. VirshyloSummaryThis research is about constructing a new algorithm for spatial modeling of the solid composition of rocks and the main advantage over classical methods of inversion with optimization - to avoid the possibility of obtaining geologically meaningless solutions. The algorithm is consistent with the results of geophysical, petrophysical and geochemical studies. The basic geophysical methods used to solve a complex inverse problem are deep seismic sounding and gravimetry. The determination of probability distributions is carried out by statistical processing of the results of geological and geochemical studies for the material composition and the introduction of confidence intervals for the results of geophysical research.
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REPEATED GEOPHYSICAL RESEARCHES OF HAZARDOUS GEOECOLOGICAL PROCESSES NEAR MINING WASTE STORAGE FACILITIES OF SOUTHERN KRYVBAS
Authors P. Pihulevskyi, V. Svystun, O. Tiapkin, A. Tolkunov and S. SlobodianiukSummaryModern mining processes in Kryvyi Rih iron ore basin (Kryvbas) are accompanied by hazardous geoecological events. The complex tectonic and hydrogeological interpretation of geological-geophysical data are necessary to prevent accidents at mining hydraulic facilities (and first of all - tailing ponds) and successfully design their increase. On an example of detailed geophysical research near the storage pond of highly mineralized mine waters in Svistunovo gorge (Southern Kryvbas) is shown that intensive tectonic fragmentation of rocks is the reason for increasing filtration parameters and deterioration of physical and mechanical properties of rocks and as a result - dangerous intensification of exogenous geological processes and contamination of underground water. It is proposed to create a regional seismic monitoring system (as one of the main subsystem of environmental monitoring of Dnipropetrovsk region) with a control center in Dnipro-city and 3 local subsystems in the main mining areas in the region: not only Kryvbas, but Nikopol manganese basin and Western Donbas coal basin.
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EVALUATION OF THE INFLUENCE OF GEOLOGICAL-TECHNICAL FACTORS ON THE DURABILITY OF CASING COLUMNS IN OIL AND GAS WELLS
Authors V.Ya. Femiak, I.M. Kovbasiuk, O.B. Martsynkiv, Ya.M. Femiak and I.I. VytvytskyySummaryIn order to assess the informative nature of the impact of various geological and technical factors that could cause collapse of casing strings, it was offered to conduct a multivariate analysis using object recognition theory. Based on the example of one of Prycarpathian deposits, informative values and diagnostic coefficients for the most and least favorable conditions from the point of view of the integrity of the casing were calculated, the main reasons for their damage were identified and measures for their prevention were proposed.
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MODERN DEFORMATION AND NEWEST MOVEMENTS OF THE EARTH’S SURFACE ON THE TERRITORY OF UKRALNE
Authors M. Orlyuk and M. IshchenkoSummaryThe article discusses the current deformation of the Earth’s surface based on the analysis of the Global Navigation Satellite Systems (GNSS) data from the GAO NAS of Ukraine in comparison with the latest lineament zones and faults, as well as with the late Pliocene-Quaternary vertical movements of the Earth’s crust. According to the results of the analysis of high-precision coordinates and displacement vectors of permanent GNSS stations in the territory of Ukraine, deformation parameters of the Earth’s surface were obtained, areas of prevailing compression values — tension and left-right-side rotation of the Earth’s surface were identified, the boundaries between which can be drawn along the latest lineament zones and faults. The areas of the predominant stretching of the Earth’s surface corresponding to the zones of the newest tectonic uplifts (Volyn-Podolsk and Periazov hills) and maximum amplitudes of the Pliocene-Quaternary movements and the areas of prevailing compression are zones of tectonic descents, minimal amplitudes of Pliocene-Quarternary movements. Four large modern geoblocks have been identified: North-West and North-East, which rotate clockwise, and South-West and South-East rotating counterclockwise. At a qualitative level, a mechanism is proposed for the interrelationship between modern and newest movements of the Earth’s crust.
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SEISMIC OBSERVATIONS IN THE LOCATION OF THE STEBNYK POTASSIUM SALT DEPOSIT
Authors I. Sapuzhak and S. VerbitskyjSummaryThe history of the production of potassium salts near Stebnik is briefly mentioned, as well as the accident at the Polimineral enterprise due to hydrogeological phenomena. Given the global experience in dealing with such situations, it is proposed to use seismic observations to locate hazardous processes in a salt mine under the developed project of the system for monitoring the location of the deposit. Observation began in October 2017 with the installation of one temporary point of seismic observations - seismic station ““Stebnik”“. It is given the description of the hardware and software complex of the seismic station, the main technical characteristics, the results of observations and their processing - catalogs of registered seismic events, examples of registered waveforms of regional and telesemic events, as well as local earthquakes in the Stebnik district, the map of their localization. To process instrument records of this seismic station, data recorded at seismic stations of the Carpathian Regional Seismological Network “Skhidnytsya” and “Morshyn” were used. On the eve, some organizational issues were resolved and at the end of August 2019 2 more temporary seismic observation points were installed - the Kozatsky hutir and Zolota gora seismic stations (named after the recreation complexes). Test procedures are currently underway and the seismic monitoring system, consisting of the mentioned stations and Stebnik, Morshin and Skhidnytsia stations, will be operational soon.
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NONLINEAR WAVES PROPAGATION IN EARTH’S CRUST AS PRESTRESSED CHAINS OF BLOCKS
More LessSummaryWe propose a new concept in the approach to the seismic process study. And the new seismic theory will improve potentialities of monitoring and modelling of natural hazards and new technologies for risk minimization and prevention. This work is a continuation of the seismic waves propagation study caused by irregularity of lithospheric stress as a result of plates structure. The given research as the numerical modelling of the chain of grains dynamics was performed to study the possibility of nonlinear soliton waves propagation in lithosphere. We take the Earth’s crust for a structured block media consisting of separate blocks and when modelling these are shaped like cubes with close sizes. It is important for understanding of Earth’s plates tectonic mechanisms, stress growth and localization, seismic manifestations of the stresses release in the form of earthquakes. From the point of view of such a model we studied the tectonic process such as subduction. We have shown that a feature of the evolution of the stress-strain state of block models is the formation of chains of stressed blocks that permeate the model. Studies have shown the finite-element model of nonlinear wave propagation in chains blocks of an arbitrary form interacting at contact.
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HYDRAULIC FRACTURE CRACK PROPAGATION MODELING IN MULTI-COMPONENT NONELASTIC GEOLOGICAL MEDIA
Authors S. Vyzhva, B. Maslov, I. Onyshchuk and O. KozionovaSummaryTight gas is very important unconventional hydrocarbon resource that is beginning to be a priory kind of energy in Ukraine. It stored in multi-component geological media, whose mechanical behavior may be considered as elastic one only, as a first step of approximation, or visco-elastic in common case. We investigate this problem by adopting the quasi-linear fractional Rabotnov model. These fractures serve as pathways for gas flow, and the maintenance of such fractures is of practical significance to the long-term recovery of tight gas. The main question to what extent will the fractures close due to the viscous deformation of tight sandstone, in a relatively long period of time. The second, during the visco-elastic creep, possible tensile stress in hydro fracture zone, can reduce the long-term strength of multi-component media. Previous results of authors were used. On the base of the quasi-linear theory of visco-elasticity, the constitutive equation for isotropic media in the presence of initial stress is derived. The equations governing infinitesimal motions superimposed on a finite deformation are used to study the effects of initial hydro-fracture stress on the creep parameters in multi-component geological media. Computer modeling was realized to evaluate the risk and reliability parameters in exploitation period.
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THE MAPPING OF SUBMERGED (FLOODING) LANDS BY GEOPHYSICAL METHODS
Authors S. Vyzhva, V. Onyshchuk, I. Onyshchuk, N. Reva and O. ShabaturaSummaryThe paper discusses the results of the basic principles of flooding processes by geophysical methods. To apply geophysics for new tasks, it is necessary to obtain and study various information about the upper part of the section (UPS) and discriminate its all layers. Each horizon has to be traced in plane and depth, and its geophysical parameters have to be determined as accurate as possible. Then use these data as the basis of geophysical mapping of soils the horizon-oriented geophysical maps, geoelectric sections and other graphic materials, which are formed. The result of processing and interpretation of geophysical survey data is a set of geological and geophysical sections and horizontal maps of electrical resistivity of soils and rocks of UPS. In this paper as an example, we share some results of the geophysical mapping technique for soil condition at the Chornobaivska key site, located on the eastern part of the Dnieper-Donetsk Basin.
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APPLICATION OF TWO-PARAMETER CLASSIFICATION OF SEISMIC ATTRIBUTES FOR PREDICTION OF HYDROCARBON DEPOSITS IN THE DNIEPER-DONETSK DEPRESSION
Authors S. Vyzhva, I. Solovyov, V. Kruhlyk and G. LisnySummaryPossibilities of multi-attribute analysis of seismic data for prediction of hydrocarbon prospective zones are shown. The conclusion is made about the expediency of using geobody technology for multi-attribute classification of geological bodies. The results of forecasting of perspective hydrocarbon zones using one and two seismic attributes are compared. Practically important results are presented for the identification of hydrocarbon-promising zones associated with structural and non-structural oil and gas traps. The results of the forecasting of oil and gas zones were obtained for deposits in the Dnieper-Donetsk basin.
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GEOSPATIAL MODELLING AND RESERVES ESTIMATION OF WADI AL SHATI IRON ORE DEPOSIT (LIBYA)
More LessSummaryMineral exploration procedures always need to integrate data in order to consider a vast range of combinations and to underline different hypotheses. Reserves estimation, either globally or regionally, has become a typical geostatistical application within the mining industry. Kriging could be a geostatistical interpolation technique utilized in the mining industry for interpolation of input purpose information and estimation of a block model (mineral resource model). In order to estimate Wadi Al Shati iron ore deposit, input data gained from 109 boreholes were used. Fe grade was selected as the major regional variable on which the present research has focused. Studies indicated that iron grade input data had single population characteristics of the area which is totally covered with sand dunes to discover any probable occurrence of iron ore. The results showed that the iron ore belt still extends the west and southwest part under the sand dunes. Finally, a new potential map for the areas of iron ore deposit was produced.
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