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Geoinformatics: Theoretical and Applied Aspects 2020
- Conference date: May 11-14, 2020
- Location: Kyiv, Ukraine
- Published: 11 May 2020
21 - 40 of 151 results
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The crustal structure of the transition from the East Black Sea Basin to the Shatsky Ridge from reinterpretation of existing refraction seismic profiles 14-15-16
Authors T. Yegorova, E. Baranova, A. Murovskaya, L. Farfuliak and K. RepinaSummaryWe represent the results of recent ray-tracing modeling for three deep seismic sounding profiles 14, 15 and 16 acquired in the Eastern Black Sea in 1960-th. They were conducted on a system of radial profiles diverging from one common shot point in the East Black Sea Basin and crossing the Shatsky Ridge. The performed modeling showed that thin (∼ 10 km) crystalline EBSB crust, with velocities increasing from 6.5 km/s in the basement to 7.0 km/s on the Moho (20–22 km), is overlain by ∼10 km-thick sediments. The continental crust of the Shatsky Ridge of ∼ 30 km thickness comprises two layers – the upper crust (6.0–6.5 km/s) of 15-km thickness and the 10-km thick lower crust (6.5–7.0 km/s). The transition from the EBSB suboceanic crust to the Shatsky Ridge continental crust occurs dramatically, on ∼25-km interval. This transition zone runs parallel to the coastline, and is associated with Alushta-Batumi magnetic anomaly of the same (NW) strike. These could be indicative of the tectonic origin of the transition zone during the main stages of evolution of the region - at the Mesozoic closure of Tethys Ocean, during the opening of the East Black Sea Basin in Cretaceous, and during the Alpine collision tectonics.
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On the prospects of hydrocarbon and hydrogen accumulations detecting within local areas of Ukrainian shield
Authors M. Yakymchuk and I. N. KorchaginSummaryThe results of applying the technology of frequency-resonance processing and interpretation of satellite images on the Ukrainian shield with the aim of studying the deep structure of this structure and searching for hydrocarbon accumulations are presented. By conducted studies on the shield the presence of two layers of granites of different ages was revealed, and the deep channels of fluids, minerals and chemical elements vertical migration, filled with granite rocks of different ages, were found. The roots of the discovered channels were recorded at depths of 470 km and 996 km. In the cross-section intervals between the upper and lower granite strata, responses from sedimentary rocks, as well as oil, condensate and gas were recorded. This cross-section interval between two strata of granites deserves a detailed study in order to hydrocarbon accumulations detect and localize.
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The most expensive “dry” exploratory well in the history of the oil industry: reasons of failure based on data of direct-prospecting methods application
Authors M. Yakymchuk and I. N. KorchaginSummaryThe materials of additional testing of mobile direct-prospecting methods on the Alaska, Peru offshore are presented. Experimental studies have been carried out in order to demonstrate the operability, efficiency and potential capabilities of the developed methods during hydrocarbons (HC) accumulations searching. The studies performed on oil and gas drilling sites confirmed the feasibility of additional works conducting with using direct-prospecting methods when choosing sites for their laying. Within deep channels (volcanoes), filled with sedimentary rocks of 1–6 groups, signals (responses) are almost always recorded at the resonant frequencies of hydrocarbons (HC) and, in many cases, amber. Signals at the frequencies of oil, condensate and gas are also recorded quite often in volcanoes, filled with limestone. In volcanic complexes filled with sedimentary rocks of 8–10 groups (dolomites, marls, siliceous rocks), responses at frequencies of oil, condensate, and gas have never been recorded. In many areas of the survey, in the contours of responses from the HC recording, the existence of a 57 km boundary was confirmed, in the region of which the oil, condensate, gas and amber are synthesized from hydrogen and carbon migrating from below.
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Results of reconnaissance studies for hydrocarbon deposits within some districts in Northern Ukraine
Authors M. Yakymchuk, I. N. Korchagin and T. MikheevaSummaryThe results of exploratory studies for hydrocarbons (HC) within five districts of the Chernihiv and Volyn regions of Ukraine are presented. The studies were carried out using mobile technology of integrated assessment of the oil and gas prospects of large blocks and local areas, including methods of frequency- resonance processing of satellite images and vertical scanning of a cross-section in order to determine the depths and thicknesses of forecasted of hydrocarbons accumulations and rocks of cross-section. The results of the work testified to the advisability of conducting the detailed exploration work for hydrocarbons in these areas. On the surveyed areas, the existence of a 57 km border was confirmed, in the area of which the synthesis of oil, condensate, gas and amber takes place. 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. The practical application of direct-prospecting technologies will help to accelerate and optimize the search and exploration process for oil and gas.
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On the prospects of hydrocarbon accumulations detection in traditional reservoirs in deep horizons of cross-section within shale gas production areas
Authors M. Yakymchuk and I. N. KorchaginSummaryThe results of experimental studies on some shale gas production areas in the USA, Argentina, and England are presented. The investigations have been conducted with using the technology of integrated assessment of the oil and gas prospects of large blocks and local areas, which include methods of frequency-resonance processing of satellite images and vertical sounding (scanning) of a cross-section in order to determine the depths and thicknesses of predicted hydrocarbon accumulations and rock. The results of studies at local sites in Eagle Ford and Vaca Muerta shale basins indicate the presence of hydrocarbon accumulations at these basins in traditional reservoirs in the lower horizons of the cross-section. Within all the examined shale gas production areas, deep channels of migration of fluids, chemical elements and minerals, filled with 1–6 groups of sedimentary rocks, were found. The materials of the work performed can be considered as additional evidence in favor of the concept of deep (abiogenic) synthesis of hydrocarbons, including those located in shale formations. Of particular interest is the survey site in England, within which there is a significant number of local zones of visible hydrogen degassing. It is advisable to conduct additional studies on its territory with the aim of a more detailed study of these local zones.
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Total Organic Carbon and Gamma Radioactivity Distribution of the Rudov Beds Formation within the Area Adjusted to Yablunivske O&G Field (Dnieper-Donets Basin)
Authors O. Karpenko, V. Ohar and I. KarpenkoSUMMARYRudov Beds is an organic rich formation within the Upper Visean (Lower Carboniferous) sedimentary complex located in the Dnieper-Donetsk basin (DDB). Its stratigraphic relation is still debatable. Rudov Beds are related to the tops of XIII Microfaunistic horizon, or related to basal part of XIIa Microfaunistic horizon. Rudov Beds are associated with play known as so-called “productive horizon V-23”. In the central part of the DDB Rudov Beds are overlying the Lower Visean carbonate formation, which was formed under the conditions of the carbonate platform. The uniqueness of regionally distributed Rudov Beds is associated with their unusual siliceous-carbonate and siliceous-shale composition, the presence of biogenic silicites; high organic matter content of mixed composition and high gamma activity. Vertically and laterally distribution of total organic carbon content (TOC) were determined according to the results of well logging data interpretation within the area Yablunivske oil and gas field. The features of the natural radioactivity of the Rudov Beds were investigated; its variability and its relation to the TOC content were analyzed. A regular trend was been identified of increasing the TOC content at 2x times towards the western part of the Yablunivske field area, which can indicate both the formation of sediments in isolated shallow sea conditions and the erosion of their upper part as a result of a break in sedimentation process. The statistical analysis shows that the anomalous values of gamma ray (GR) in the lower part of the Rudov Beds have a specific genesis, which is not correlates with the organic matter content. Keywords: Rudov Beds; TOC, gamma ray, Yablunivske oil and gas field, lateral variability.
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Geomagnetic studies at Rubaniv gas field in outer zone of Carpathian Foredeep, Ukraine
Authors V. Maksymchuk, R. Kuderavets, O. Menshov, P. Bodlak, I. Chobotok, Y. Nakalov and N. PyrizhokSUMMARYThe results of geomagnetic studies at the Rubaniv gas field in the Outer zone of the Carpathian Foredeep are considered. A detailed study of the anomalous magnetic field and the magnetic properties of rocks and soils at the zones of hydrocarbon deposits is a basement for the application of the magnetic prospecting for direct hydrocarbon prospecting. At the present study we investigate the structure of the local anomalous magnetic field in the zones of hydrocarbon fields within the Carpathian Foredeep for the identification of the genetic relation of the magnetic properties of surface rocks and soils with the microseepage of hydrocarbons. The total magnetic field vector T and its components (declination, inclination, horizontal and vertical components) along the 5 transect were measured. The soil magnetic susceptibility in transects and in the profiles (genetic horizons) were studied. The local positive magnetic anomalies with the amplitude from 2 to 8 nT and dispersion of the soil magnetic susceptibility above the Rubaniv gas field were detected. This data indicated the genetic relations between gas deposits, microseepage, and changes of the magnetic field and soil magnetism.
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Seismic-facies research in the southern near-flank zone of the Dnieper-Donets basin
Authors N. I. Nesina and V. V. OharSUMMARYSeismic data acquisition and interpretation as a key method of modern oil and gas geological exploration is widely in use to build sedimentation and sequence models, detailed analysis of geological column, and the prediction of local non-anticline type lithological objects that could be potential hydrocarbon traps. Stratimagic software of Paradigm Geophysical seismic facies analysis (SFA) was applied to 3D seismic exploration data acquired the in several areas in the Carboniferous of the Dnieper-Donets Basin. This paper presents the results of SFA on the Livenska area located in the central part of the Southern Near-Flank zone of the Dnieper-Donets Basin. The purpose of the study was to map the local lithological hydrocarbon prospects in the upper part of the Bashkirian (Middle Carboniferous) sequence and to identify zones of gas-bearing sandstones distribution (B-22–23 pay horizon) in the Upper Visean (Lower Carboniferous) sequence. As a result, the seismic facies maps with a set of other maps were built for both stratigraphic intervals. They confirmed the presence of the paleo-channel in the Bashkirian sedimentary sequence and a zone of gas-bearing sandstones in the Upper Visean ones. So, it has been shown that Stratimagic software is an effective tool for the sedimentary record detail investigation.
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Identification of non-structural traps based on AVO-analysis and Elastic Inversion within the northern edge of the Dnieper-Donets Depression
Authors P. Kuzmenko, I. Mykhalevych and S. VyzhvaSummaryNon-structural traps in the sedimentary stratum of the northern edge of the Dnieper-Donets Depression had not explored sufficiently by seismic methods. In this work, the authors demonstrate research and analysis of seismic data elastic characteristics using methods of AVO-analysis and elastic inversion with identification of lithologically trapped gas-saturated object. Alongside with the positive experience of acoustic contrast objects on seismic data identification, the authors present the generalized limitations of using AVO-analysis and elastic seismic inversion, in particular, within the northern edge and the whole Dnieper-Donets Depression.
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Recommendations for wells drilling in the unfavorable structural-tectonic conditions
Authors S. Vyzhva, I. Solovyov, V. Kruhlyk and G. LisnySUMMARYProspects for further exploration and exploitation of hydrocarbon fields with practically exhausted potential of structural-tectonic traps have been analyzed. Appropriate approaches are proposed to identify new traps in such fields or areas. They are based on a comprehensive study of horizons promising for hydrocarbons. Such study involves the analysis of regional oil and gas horizons, the attraction of additional geological and geophysical information from adjacent fields or areas and the use of direct hydrocarbon indicators. Studying the behavior of regional productive horizons within the license area helps to identify common factors for the presence of hydrocarbons. Geological and geophysical data of adjacent areas allow us to extrapolate these data and to obtain the prerequisites for the detection of perspective fragments of structural-tectonic traps. At the same time, the use of direct hydrocarbon indicators is the most reliable way to detect hydrocarbon traps of any type. Together with the possibility of detecting oil and gas traps, the use of direct indicator technologies allows us to estimate the amount of hydrocarbon resources discovered. The above approaches have revealed areas promising for the presence of hydrocarbons in the sediments of the Moscow stage of middle carbon. It is has been recommended the well drilling for sediments of the regional production complex M-7.
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Experience of the 3D interpretation of gravity data in the southeast of Volyno-Podillya
Authors S. G. Anikeyev, B. B. Hablovskyi, S. E. Rozlovska, M. V. Shtogryn and A. E. ZagraySUMMARYThe southeastern part of Volyno-Podillya in the oil and gas prospective is considered to be poorly promising. Nevertheless, some prospects are associated with structural forms on the surface of Cambrian rocks and with the rocks of the crystalline basement. Given the scarcity of drilling and seismic data, the role of other geological and geophysical methods, in particular gravity prospecting, is significantly increasing. For example, erosive incisions on the surface of the Cambrian, predicted by Kh. B. Zayats, are probably filled with terrigenous deposits of the Ordovician. Zones of lower density of rocks and incisions are associated with the buried tectonic zone and with lowering of the crystalline basement behind longitudinal faults. These oil and gas prospective zones are displayed in the gravity field by bands of negative anomalies. Therefore, there is a reason to predict the existence of the promising areas based on the interpretation of gravimetric data. The paper presents an analysis of the morphology of local anomalies of the gravity and magnetic fields and density distribution patterns scheme along the surfaces of the Precambrian, Paleozoic, and Mesozoic according to the solution of the three-dimensional gravity inversion.
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The experiences with anisotropic averaging transformation of gravity and magnetic fields (on the example of the southeast part of Ukrainian Carpathians)
Authors S. G. Anikeyev, S. E. Rozlovska, B. B. Hablovskyi, M. V. Shtogryn and M. O. KarpenkoSUMMARYThe prospects for finding new oil and gas deposits in the Carpathian region largely depend on the possibility of clarifying and detailing the fronts of tectonic zones and deep faults, as well as thrusts and linear complications of the sedimentary cover, the position of which depends on the depth of the slice. These extended linear structures in gravity and magnetic fields are displayed by substantially elongated anomalies, chains of small local anomalies, contours of a sharp change in morphology of field or gradient bands. Isolation and tracking of anomalies that are hidden in a complex regional background or obscured by other factors are carry out with transformations. The probable geological content and estimated depth of the sources of localized groups of anomalies are determined by the frequency and relative depth characteristics of the transformations. The paper proposes variants of combined isotropic and anisotropic transformations of averaging, which, according to their characteristics, are intended to detect local and substantially elongated anomalies of a certain direction, as well as the approximate depth of their sources, in gravity and magnetic fields. Examples of experimental application of these combined transformations are also given.
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Estimation of the pore space structure of tight gas reservoirs of the Moscovian stage locates in DDB Eastern part using a limited well logging dataset
Authors O. V. Oliinyk, V. V. Antoniuk, I. M. Bezrodna and N. V. RusachenkoSUMMARYDuring the exploration, productive intervals identification, and development of tight gas reservoirs fields, an important part is the accurate determination of the capacity, and the structure of the pore space.
For the first time, the technique of Prodaivoda G., Vyzhva S. and Bezrodna I. was used for determining the pore structure of the tight gas reservoirs (porosity cutoff is 4%).
The authors have synthetically generated bulk density and S-wave velocity logs through the multi-mineral model and using the Greenberg-Castagna equation.
According to a limited of well logging dataset, the authors have determined the tight gas reservoirs pore structure of the Moscovian stage in the Spivakivskyi gas-bearing region which locates in the Eastern part of the DDB.
It is established that the void space of the investigated gas reservoirs is mainly composed of tight pores (PHI,tight - 4–7.8%). Fractures are in the intervals of 4136.9–4137.1 m and 4127.9–4128.6 m and PHI,fr is 0.25% and 0.1% respectively. Intergranular pores are almost absent, but in some intervals PHI, int.gr is 0.1–0.9%.
Estimation of the space structure of the given rock intervals provides additional valuable information for further wells stimulation in order to obtain hydrocarbon inflows.
Keywords: tight gas, reservoir, space pore structure, well logging.
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The influence peculiarities of the chemical composition of washing liquids on the results of electrical and acoustic methods
Authors O. N. Trubenko, D. D. Fedoryshyn, R. O. Marynchak, S. D. Fedoryshyn and A. O. TrubenkoSummaryThe problem of the influence of different chemical agents on the results of electrical, radioactive and acoustic methods and the inconsistency of their results with the actual parameters of the reservoir rocks in the Paleogene and Neogene deposits of the gas and gas condensate deposits of the Krukenitsky depression of the Precarpathian Trough are considered.
The diffusion potentials dependence on the concentration of chemical reagents with contacting solutions have been established. The factors that lead to the improvement of the breakdown of thin-bedded Paleogene and Neogene geological sections of gas and gas condensate fields within the Krukenitsky depression are established.
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The use of integrated geological, geophysical and technological information to divide a section into homogeneous intervals and make decisions when drilling wells
More LessSummaryImproving the efficiency and quality of well drilling largely depends on improving the quality of information received. The quality of decisions made during drilling also substantially depends on the quality of information. Widely used in recent years in world practice, geological and technological research in the process of drilling allows us to solve a number of problems in the drilling process, when information about the section of the well being drilled is missing or is available in a limited amount. The application of the results of the complex of geological, geophysical and technological research allows you to more deeply study the section and thereby improve the quality of decisions. This paper is devoted to the analysis of information obtained during drilling, assessment of its quality, its application for identifying homogeneous intervals on the example of four wells in the Bahar field, which helps to improve the quality of decisions at various stages of drilling.
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The results of testing methods of frequency resonance processing of satellite images within areas of technical micro-diamonds (lonsdalite) deposits location
Authors M. Yakymchuk and I. N. KorchaginSummaryThe results of reconnaissance studies in the areas of Ilyinetsky and Popigaysky craters (ring structures) location, as well as the Kumdy-Kol micro-diamond deposits in Northern Kazakhstan are analyzed. Additional facts have been obtained in favor of the volcanic nature of all investigated structures. These evidences are the roots of deep channels (volcanoes), filled with ultramafic rocks at great depths: 723 and 470 km. Within all three objects of the survey, no responses from kimberlites and traditional diamonds were recorded; signals at the resonant frequencies of technical micro-diamonds (lonsdalite) were recorded. By the cross-section scanning the following intervals of the responses from lonsdalite fixing are identified: Ilyinetsky structure – 300 m - 23–24 km; Popigai Crater – 290–16730 m; Kumdy-Kol deposit – 70–2420 m. The conducted studies also suggest the possible synthesis of the lonsdalite mineral in volcanic complexes, filled with ultramafic rocks. It is advisable to conduct a survey of volcanoes of this type in order to record responses at the resonant frequencies of this mineral. Lonsdalite detection sites in various regions are also worth exploring. In general, mobile direct-prospecting technology of frequency-resonance processing of satellite images and photographs can be used to study the deep structure of ring structures in different regions of the globe and their genesis establish.
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3-D geochemical modelling of molybdenum mineralization at the East flank of Serhiivka complex Au-Mo deposit
Authors V. Sukach, O. Hrinchenko, I. Antykhovych and L. RiazantsevaSUMMARYSerhiivka is a complex Au-Mo deposit of Middle Dnipro granite-greenstone province of Ukrainian Shield, that is situated in the southern part of Sura greenstone belt. The Serhiivka deposit an be subdivided into two ore sites – Central Serhiivka with predominant gold mineralization and East Serhiivka that is characterized by predominant distribution of molybdenum mineralization. This paper discusses 3-D model created on the base of chemical and geochemical data available for the East flank of Serhiivka deposit. Dataset includes 137 boreholes, 12026 samples and 109314 analyses.
Mineralization patterns and distribution features of Mo, Au, Cu and Ag are studied with application of following software programs – Isatis (three-dimensional variogram analysis, three-dimensional geostatistics), ArcGis (mapping of two-dimensional data array, two-dimensional constructions) and EMS-I GMS (mapping of three-dimensional data array, three-dimensional geostatistics). In future, 3-D model created might be used for optimal location of exploration borehole grid and mine workings at subsequent stages of exploration and possible exploitation of Serhiivka complex Au-Mo deposit.
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The use of 2D/3D GIS software for exploration purposes: case studies from Canada and Ukraine
Authors K. Poliakovska, I. R. Annesley, O. Ivanik, J. Sykes and K. PandurSummary2D and 3D geomodelling is a great tool for visualization of different geological systems and allows us to better understand a given prospective mineralized area.
In this research study, 2D/3D geological-geophysical models of some areas within the Canadian (Alces Lake property (SK, Canada) and Ukrainian (Azov Block) Shields were constructed.
The Alces Lake property is located within the Beaverlodge Domain, about 28 km north of the Athabasca Basin margin and has one of the highest rare earth element (REE) grades in the world. The REEs within Alces Lake are hosted in monazites within granitic to residual melt pegmatites, which are associated with biotite-rich (+/− sulfides) paragneisses.
In Ukraine, most of the REE deposits and occurrences are located within the Ukrainian Shield with the Azov Block being one of the most promising areas. The Yeliseyev field of differentiated REE pegmatites, the Zelena Mogyla and The Balka Kruta deposit were studied.
During the process of geomodelling, three-dimensional structures, surfaces, and mineralization objects were built based on drill hole core/down-hole data, geophysical data (magnetics/gravity/EM), geochemical data, topographic data, assessment and technical reports, and geological maps etc. The resulting models show the distribution of REEs within the different properties and outline some potential targets.
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New (?) calcium-thorium-uranium silicate (calciothorouranite) from thorium-uranium ore albitites from the Novooleksisvka ore occurrence, the Ukrainian Shield
Authors I. Mihalchenko and A. AndreevSummaryThe article presents the results of a study of calcium-thorium-uranium silicate, which was discovered by the authors in the Precambrian thorium-uranium albitites of the actinolite-diopside group of metasomatic facies of alkaline sodium metasomatites of the Novooleksiivka ore occurrence of the Partizansky ore field of the Central-Ukrainian ore district. It is shown that the main components of the chemical composition of the mineral are UO2, SiO2, ThO2, CaO. The usual impurities are FeO, Y2O3, Al2O3, BaO. The content of PbO in the different crystals vary within (3.05–11.6) %. The chemical composition of the mineral is not constant, apparently due to significant epigenetic transformations. The signs of transformations are manifested of the presence of reaction boundaries with the epidote (the latter seems to be “eating” this radioactive mineral), transformations in region of boundaries with the albite, of the presence of numerous cracks, which are filled with uranium black with a significant impurity Pb. The detected calcium-thorium-uranium silicate differs by high content of ThO2, CaO, Y2O3 from Calciothorite, Nenadkevite, Uranophane, Coffinite, and a high content of UO2, CaO, Y2O3 from Calciothorite. Probable crystal-chemical formula of calcium-thorium-uranium silicate – (Ca2,U,Th,) [SiO4]∙nH2O. In the case of proving that this silicate is a new mineral, we are proposed to call this mineral calciotorouranite. The existence of an isomorphic series of calciotorite-calciocoffinite (the latter is not yet known) is assumed.
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Peculiarity of inelastic properties of sedimentary SiO2, foam polystyrene
Authors A. P. Onanko, D. V. Charnyi, Y. A. Onanko, M. P. Kulish, O. P. Dmytrenko and R. V. HomenkoSummaryThe analysis of the elastic anisotropy parameters sedimentary rocks SiO2 showed that the rhombic approximation provided the maximum harmonization of the calculated and the experimental data and the efficiency of using the invariant-polarization method to solve the acoustic texture analysis problems. The general conclusions were obtained: they are represented by fine grains with grain sizes d ˂ 100 mkm, the same range of values of quasi-longitudinal ultrasonic velocity VP, elastic module E, “fast” quasi-transverse ultrasound velocity VS, shear module G, Puasson coefficient μ, Debye temperature θD, the open porosity coefficient KPO is high.
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