Pub Date : 2023-01-30DOI: 10.24028/gj.v44i5.272326
S.V. Krakovskа, L. Palamarchuk, Ye.L. Аzarov, А.Yu. Chyharеvа, Т.М. Shpytаl
The study is devoted to the search for the optimal methodical approach for bias correction of surface air temperature from real climatic indicators for the territory of Ukraine, obtained in the projections of ensembles of regional climate models (RCM) based on the use of regression analysis, namely the least squares method (LSM) with various options of its application. The procedure included: searching for weight coefficients of linear regression equations to minimize the deviation of the forecast from the observations for each model and each grid node of the 10 RCM for two climatic periods 1961—1990 and 1991—2010; obtaining, on the basis of equations with established coefficients, the averaged errors of ensembles of models for various variants of LSM application; and determining the limits of the application of such methodical approaches to the formation of an optimal ensemble. Among all options for using forecasting functions, it was found that the most accurate was the option of applying LSM to differences (shifts) in values between periods when one uses monthly values of the climate indicator. In general, the use of monthly values showed the best approximation of the model data to the observation data used from the E-OBS database. It was found that in a certain period the approximation of the LSM is significantly better than the average, but the advantage is lost if the obtained weighting factors are used in another period. For further use, the proposed approach can be modernized in the direction of more detailed clustering in time and space, which will allow adjusting the model data even closer to the observed ones. However, our results make us doubt the feasibility of applying such an approach to the forecast of climate fields, since they are not stationary and can significantly transform over time. In this case, arithmetic averaging and averaging of shifts or the delta method remain the optimal choice for forming a prognostic ensemble of RCM.
{"title":"The least squares method in estimating the accuracy of surface air temperature projections based on ensembles of regional climate models","authors":"S.V. Krakovskа, L. Palamarchuk, Ye.L. Аzarov, А.Yu. Chyharеvа, Т.М. Shpytаl","doi":"10.24028/gj.v44i5.272326","DOIUrl":"https://doi.org/10.24028/gj.v44i5.272326","url":null,"abstract":"The study is devoted to the search for the optimal methodical approach for bias correction of surface air temperature from real climatic indicators for the territory of Ukraine, obtained in the projections of ensembles of regional climate models (RCM) based on the use of regression analysis, namely the least squares method (LSM) with various options of its application. The procedure included: searching for weight coefficients of linear regression equations to minimize the deviation of the forecast from the observations for each model and each grid node of the 10 RCM for two climatic periods 1961—1990 and 1991—2010; obtaining, on the basis of equations with established coefficients, the averaged errors of ensembles of models for various variants of LSM application; and determining the limits of the application of such methodical approaches to the formation of an optimal ensemble. \u0000Among all options for using forecasting functions, it was found that the most accurate was the option of applying LSM to differences (shifts) in values between periods when one uses monthly values of the climate indicator. In general, the use of monthly values showed the best approximation of the model data to the observation data used from the E-OBS database. \u0000It was found that in a certain period the approximation of the LSM is significantly better than the average, but the advantage is lost if the obtained weighting factors are used in another period. For further use, the proposed approach can be modernized in the direction of more detailed clustering in time and space, which will allow adjusting the model data even closer to the observed ones. However, our results make us doubt the feasibility of applying such an approach to the forecast of climate fields, since they are not stationary and can significantly transform over time. In this case, arithmetic averaging and averaging of shifts or the delta method remain the optimal choice for forming a prognostic ensemble of RCM.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43522812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-30DOI: 10.24028/gj.v44i5.272329
T. Mikheeva, O.P. Lapina, T.M. Kyshman-Lavanova, T. I. Prychepiy
The article presents the results of scientific research on the creation of computer technology for the interpretation of geophysical field data in the exploration of oil-and-gas deposits of Ukraine. The theoretical, informational, technological and methodical foundations for increasing the efficiency of geological exploration work due to the in-depth extraction of information from geological and geophysical data based on their complex interpretation within the framework of new mathematical models have been developed. Three-dimensional gravity and magnetometric modeling can be directed to the detection of densification zones and the tracing of tectonic disturbances in the consolidated crust, without which the existence of hydrocarbon transportation channels is impossible. The practical application of examples of quantitative interpretation of three-component magnetic survey data is given, which will significantly help in the detection and localization of hydrocarbon deposits. Development and expansion of the software complex for the interpretation of magnetotelluric data based on the use of impedance-type boundary conditions. The technique is intended for visualization of MTS data at the stage of qualitative interpretation in parallel with the method of the impedance tensor and Wiese vectors. The absolute advantage of this approach is its independence from the condition of a plane incident wave and the use of all six components of the electromagnetic field (including the Z component of the electric component of the MT field). The integration of statistical and deterministic methods during the inversion of geophysical data will increase the re-liability of the obtained geological results. The relevance and importance of the results presented in the work is determined by the conceptual novelty of methods and tools for forecasting new promising areas, as well as the reassessment of reserves of known deposits.
{"title":"Geophysical data interpretation technologies in the study and exploration of oil-and-gas deposits","authors":"T. Mikheeva, O.P. Lapina, T.M. Kyshman-Lavanova, T. I. Prychepiy","doi":"10.24028/gj.v44i5.272329","DOIUrl":"https://doi.org/10.24028/gj.v44i5.272329","url":null,"abstract":"The article presents the results of scientific research on the creation of computer technology for the interpretation of geophysical field data in the exploration of oil-and-gas deposits of Ukraine. The theoretical, informational, technological and methodical foundations for increasing the efficiency of geological exploration work due to the in-depth extraction of information from geological and geophysical data based on their complex interpretation within the framework of new mathematical models have been developed. Three-dimensional gravity and magnetometric modeling can be directed to the detection of densification zones and the tracing of tectonic disturbances in the consolidated crust, without which the existence of hydrocarbon transportation channels is impossible. The practical application of examples of quantitative interpretation of three-component magnetic survey data is given, which will significantly help in the detection and localization of hydrocarbon deposits. Development and expansion of the software complex for the interpretation of magnetotelluric data based on the use of impedance-type boundary conditions. The technique is intended for visualization of MTS data at the stage of qualitative interpretation in parallel with the method of the impedance tensor and Wiese vectors. The absolute advantage of this approach is its independence from the condition of a plane incident wave and the use of all six components of the electromagnetic field (including the Z component of the electric component of the MT field). The integration of statistical and deterministic methods during the inversion of geophysical data will increase the re-liability of the obtained geological results. The relevance and importance of the results presented in the work is determined by the conceptual novelty of methods and tools for forecasting new promising areas, as well as the reassessment of reserves of known deposits.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49629575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-30DOI: 10.24028/gj.v44i5.272325
T. Burakhovych, V. Ilienko, A. Kushnir
To study the deep structure of the geoelectrically complex junction zone of three megablocks of the western part of the Ukrainian Shield (Volyn', Podil, and Ros'), a three-dimensional model of the central part of the Zvizdal-Zaliska and Brusyliv fault zones was created. It is based on modern experimental observations of the Earth's natural low-frequency electromagnetic field in a wide range of periods. Synchronous experimental data of deep magnetotelluric sounding and magnetovariational profiling, obtained by the Institutes of the National Academy of Sciences of Ukraine in 2009—2019, were analyzed. The main issues of the geoelectrical modeling methodology using the Mtd3fwd software complex were considered, such as model elements, stages, alternative models, examples of calculations and comparison of observations, errors, etc. The constructed model analysis showed that of the large number of near-surface anomalies with low resistivity (5 to 100 Ohm · m), most sink to 500 m and only a few reach a depth of 1 km and are followed up to 11 km. It was established that there are connections between conductivity and structural features of the Zvizdal-Zaliska, Brusyliv, Nemyriv fault zones, the Samgorod fault and the Kocheriv synclinorium. Most of the isolated conductors appear in a mosaic pattern along the extended fault zones and form interspersed chains of high and low resistivity. Regional anomalies were confirmed and detailed both in the deep part of the crust and in the upper mantle; part of the Zvizdal-Zaliska fault zone appeared at depths of 15—30 km as a contact zone of abnormally high and low resistivities. Anomalies are confined to elongated zones of metasomatization and graphitized rock areas, some of the surface anomalies correspond to areas of the weathering crust. Most of the anomalies coincide with ore occurrences, ore-bearing fields and mineral deposits. The conducted geological-geoelectrical analysis of the model made it possible for the first time to identify two promising areas for further study that meet the geoelectrical criteria for the mineral search: along the Zvizdal-Zaliska fault zone between the Samgorod and Unava faults; along the Samgorod fault in the area of its intersection with the Kocheriv and Taboriv faults.
{"title":"Three-dimensional geoelectrical model of the central part of the Zvizdal-Zaliska and Brusyliv fault zones of the Ukrainian Shield","authors":"T. Burakhovych, V. Ilienko, A. Kushnir","doi":"10.24028/gj.v44i5.272325","DOIUrl":"https://doi.org/10.24028/gj.v44i5.272325","url":null,"abstract":"To study the deep structure of the geoelectrically complex junction zone of three megablocks of the western part of the Ukrainian Shield (Volyn', Podil, and Ros'), a three-dimensional model of the central part of the Zvizdal-Zaliska and Brusyliv fault zones was created. It is based on modern experimental observations of the Earth's natural low-frequency electromagnetic field in a wide range of periods. Synchronous experimental data of deep magnetotelluric sounding and magnetovariational profiling, obtained by the Institutes of the National Academy of Sciences of Ukraine in 2009—2019, were analyzed. The main issues of the geoelectrical modeling methodology using the Mtd3fwd software complex were considered, such as model elements, stages, alternative models, examples of calculations and comparison of observations, errors, etc. The constructed model analysis showed that of the large number of near-surface anomalies with low resistivity (5 to 100 Ohm · m), most sink to 500 m and only a few reach a depth of 1 km and are followed up to 11 km. It was established that there are connections between conductivity and structural features of the Zvizdal-Zaliska, Brusyliv, Nemyriv fault zones, the Samgorod fault and the Kocheriv synclinorium. Most of the isolated conductors appear in a mosaic pattern along the extended fault zones and form interspersed chains of high and low resistivity. Regional anomalies were confirmed and detailed both in the deep part of the crust and in the upper mantle; part of the Zvizdal-Zaliska fault zone appeared at depths of 15—30 km as a contact zone of abnormally high and low resistivities. Anomalies are confined to elongated zones of metasomatization and graphitized rock areas, some of the surface anomalies correspond to areas of the weathering crust. Most of the anomalies coincide with ore occurrences, ore-bearing fields and mineral deposits. The conducted geological-geoelectrical analysis of the model made it possible for the first time to identify two promising areas for further study that meet the geoelectrical criteria for the mineral search: along the Zvizdal-Zaliska fault zone between the Samgorod and Unava faults; along the Samgorod fault in the area of its intersection with the Kocheriv and Taboriv faults.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47618892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-30DOI: 10.24028/gj.v44i5.272324
O. Verpakhovska, V. Kobolev, V. Pylypenko
For many years, the Institute of geophysics has been developing original versions of the finite-difference migration and wavefield modeling techniques for a valid reproduction of the geological cross-section. The modeling provides a practical test of the accuracy of the reproduction of various geological structure features on a migration result and a way to define, in the observed field, the waves which can be used to produce a migration image of the geologic environment efficiently. In 2013, the Institute conducted a marine seismic investigation with reflection CDP (Common Deep Point) profiles on the continental slope of the NW part of the Black Sea. The registered wavefields were processed using full-wave finite-difference post-stack migration. The efficiency and validity of the processing methods for various geological structures were evaluated with the help of finite-difference modeling of the wavefield based on solving the wave equation on a grid with a seven-point pattern. The study validates the precision of marine seismic data processing using full-wave finite-difference post-stack migration with the help of wavefield modeling.
多年来，地球物理研究所一直在开发有限差分偏移和波场建模技术的原始版本，以有效再现地质剖面。该建模提供了对各种地质结构特征在偏移结果上的再现准确性的实际测试，以及在观测场中定义可用于有效生成地质环境偏移图像的波的方法。2013年，该研究所在黑海西北部的大陆坡进行了一次海洋地震调查，采用反射CDP（Common Deep Point）剖面。使用全波有限差分叠后偏移处理配准的波场。基于在具有七点模式的网格上求解波动方程，借助波场的有限差分建模，评估了各种地质结构的处理方法的效率和有效性。该研究在波场建模的帮助下验证了利用全波有限差分叠后偏移处理海洋地震数据的精度。
{"title":"The precision of the migration image of the depth section on the seismometry observations on northwestern Black Sea shelf","authors":"O. Verpakhovska, V. Kobolev, V. Pylypenko","doi":"10.24028/gj.v44i5.272324","DOIUrl":"https://doi.org/10.24028/gj.v44i5.272324","url":null,"abstract":"For many years, the Institute of geophysics has been developing original versions of the finite-difference migration and wavefield modeling techniques for a valid reproduction of the geological cross-section. The modeling provides a practical test of the accuracy of the reproduction of various geological structure features on a migration result and a way to define, in the observed field, the waves which can be used to produce a migration image of the geologic environment efficiently. \u0000In 2013, the Institute conducted a marine seismic investigation with reflection CDP (Common Deep Point) profiles on the continental slope of the NW part of the Black Sea. The registered wavefields were processed using full-wave finite-difference post-stack migration. The efficiency and validity of the processing methods for various geological structures were evaluated with the help of finite-difference modeling of the wavefield based on solving the wave equation on a grid with a seven-point pattern. \u0000The study validates the precision of marine seismic data processing using full-wave finite-difference post-stack migration with the help of wavefield modeling.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46941618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.24028/gj.v44i4.264848
L. Gorbachova, B. Khrystiuk, V. Shpyg, D. Pishniak
In this paper results of the complex analysis of surface air temperature tendencies investigations at the Ukrainian Antarctic Akademik Vernadsky station are represented. Antarctica is a region that has a high rate of surface air temperature increase. The Antarctic Peninsula has experienced particularly fast warming, which has the highest temperature rise in the Southern Hemisphere. Therefore, in Antarctica, the study of surface air temperature change is important. The Ukrainian Antarctic Akademik Vernadsky station is located on Galindez Island near the Antarctic Peninsula. Investigation of the surface air temperature is especially relevant to the Akademik Vernadsky station, because it has difficult conditions for its formation. The research goal is the estimation of tendencies, homogeneity and stationarity of the annual and mean monthly values of surface air temperature at the Ukrainian Antarctic Akademik Vernadsky station based on a combined approach with the use of several statistical and graphical methods. The use of various statistical methods that differ in characteristics (sensitivity to the law of distribution, autocorrelation, etc.) allows obtaining more reliable estimates. Graphic methods give an opportunity to analyze the tendencies over time and its change periods, the cyclical fluctuations and their characteristics (phases of increase and decrease, their duration, synchronicity, in-phase). Therefore, 4 statistical tests (standard normal Alexandersson test, Buishand test, Pettitt test, von Neumann relation) and 2 graphical methods (mass curve and residual mass curve) were used in the study. At the Ukrainian Antarctic Akademik Vernadsky station, the observation series of the mean annual air temperature are quasi-homogeneous and quasi-stationary, as it has only a cooling phase and a warming phase of long-term cyclical fluctuations, which are also unfinished. The transition from the cooling phase to the warming phase took place in 1982. Tendencies in mean monthly air temperatures are similar to tendencies in mean annual temperatures. The differences are only for some months, namely, for the period from September to December.
{"title":"Estimation of tendencies, homogeneity and stationarity of air temperature at the Ukrainian Antarctic Akademik Vernadsky station during 1951—2020","authors":"L. Gorbachova, B. Khrystiuk, V. Shpyg, D. Pishniak","doi":"10.24028/gj.v44i4.264848","DOIUrl":"https://doi.org/10.24028/gj.v44i4.264848","url":null,"abstract":"In this paper results of the complex analysis of surface air temperature tendencies investigations at the Ukrainian Antarctic Akademik Vernadsky station are represented. Antarctica is a region that has a high rate of surface air temperature increase. The Antarctic Peninsula has experienced particularly fast warming, which has the highest temperature rise in the Southern Hemisphere. Therefore, in Antarctica, the study of surface air temperature change is important. \u0000The Ukrainian Antarctic Akademik Vernadsky station is located on Galindez Island near the Antarctic Peninsula. Investigation of the surface air temperature is especially relevant to the Akademik Vernadsky station, because it has difficult conditions for its formation. The research goal is the estimation of tendencies, homogeneity and stationarity of the annual and mean monthly values of surface air temperature at the Ukrainian Antarctic Akademik Vernadsky station based on a combined approach with the use of several statistical and graphical methods. The use of various statistical methods that differ in characteristics (sensitivity to the law of distribution, autocorrelation, etc.) allows obtaining more reliable estimates. Graphic methods give an opportunity to analyze the tendencies over time and its change periods, the cyclical fluctuations and their characteristics (phases of increase and decrease, their duration, synchronicity, in-phase). Therefore, 4 statistical tests (standard normal Alexandersson test, Buishand test, Pettitt test, von Neumann relation) and 2 graphical methods (mass curve and residual mass curve) were used in the study. \u0000At the Ukrainian Antarctic Akademik Vernadsky station, the observation series of the mean annual air temperature are quasi-homogeneous and quasi-stationary, as it has only a cooling phase and a warming phase of long-term cyclical fluctuations, which are also unfinished. The transition from the cooling phase to the warming phase took place in 1982. Tendencies in mean monthly air temperatures are similar to tendencies in mean annual temperatures. The differences are only for some months, namely, for the period from September to December.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41758927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.24028/gj.v44i4.264847
Y. Starodub, V. Karabyn, A. Havrys, V. Kovalchuk, A. Rogulia, S. Yemelyanenko
Object of research is to develop and carry out a methodology investigation of the regional ecological changes in the Pre-Carpathian hydro-lithosphere in a state of emergency caused by flooding. Method involves obtaining the results by integrating experimental field-path studies and theoretical model research, laboratory scientific comparison, the analysis and synthesis of final results. The studied model is the flooding in the Carpathian region east of the Carpathian arc in Ukraine, flooding parts of Pre-Carpathians Lviv region — industrially and recreationally important regions: Stebnyk, Borislav and Drohobych cities. Scientific novelty: the article aims to develop a method for an integrated approach to study of the territory in the question of flooding through a combined interpretation of geophysical, geological, and chemical data when considering a strategically important Pre-Carpathian region. The theoretical and practical significance of the results obtained is substantiating the feasibility and possibility of the complex application of geophysical-geological and chemical data for the practical interpretation of geoinformation data. Results will be of use to applied research in geophysics and ecology and contribute to improving of the ecological situation in selected regions. Obtained results contribute to the development of geoinformation technologies for complex geophysical-geological and chemical research in the environmental safety of territories in the event of emergencies.
{"title":"Geophysical research in the pre-Carpathian hydrosphere situation for the environmental civil protection purposes","authors":"Y. Starodub, V. Karabyn, A. Havrys, V. Kovalchuk, A. Rogulia, S. Yemelyanenko","doi":"10.24028/gj.v44i4.264847","DOIUrl":"https://doi.org/10.24028/gj.v44i4.264847","url":null,"abstract":"Object of research is to develop and carry out a methodology investigation of the regional ecological changes in the Pre-Carpathian hydro-lithosphere in a state of emergency caused by flooding. Method involves obtaining the results by integrating experimental field-path studies and theoretical model research, laboratory scientific comparison, the analysis and synthesis of final results. The studied model is the flooding in the Carpathian region east of the Carpathian arc in Ukraine, flooding parts of Pre-Carpathians Lviv region — industrially and recreationally important regions: Stebnyk, Borislav and Drohobych cities. Scientific novelty: the article aims to develop a method for an integrated approach to study of the territory in the question of flooding through a combined interpretation of geophysical, geological, and chemical data when considering a strategically important Pre-Carpathian region. The theoretical and practical significance of the results obtained is substantiating the feasibility and possibility of the complex application of geophysical-geological and chemical data for the practical interpretation of geoinformation data. Results will be of use to applied research in geophysics and ecology and contribute to improving of the ecological situation in selected regions. Obtained results contribute to the development of geoinformation technologies for complex geophysical-geological and chemical research in the environmental safety of territories in the event of emergencies.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47153586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.24028/gj.v44i4.264839
O. Gintov, O. Usenko
The Gaivoron-Zavalie site and the Golovanevsk suture zone (GSZ) of the Bug mining region (BMR) in the Middle Bug region have been a «testing ground» for studying the structure and stratigraphy of the Early Precambrian complexes of the USh for many years. In the article, using their example, the Early Precambrian part of the Correlation Chronostratigraphic Scheme of the USh (CCS USh) and the issues arising around its discussion and the need for changes have been considered here. The main problem is to find out series, formations and rock strata in the CCS of USh, which is quite debatable. It has been shown that some rock strata (leucogranulite formation and Zelenolevadov rock strata, a significant part of the Koshar-Alexandrov suite) refer to the formation-genetic series of quartz-feldspar metasomatites, in particular, to the structural-formation association of metasomatites of zones of regional faults and they are not stratigenic. According to isotope-geochronological data, the bereznin rock strata is not Archean and therefore does not belong to the Dniester-Bug series. The layering, banding and gneissovity of the enderbite-gneiss complex of the Gaivoron-Zavalie section are associated with its intersection of a dense network of fault zones and therefore this area refers to the area of development of highly dispersed metamorphic tectonites, rather than the stratigene rock strata, which some researchers try to call the «Salkovska Formation». The association of the iron-ore strata of the Bug mining region into the Pavlov rock strata of the Archean Dniester-Bug series is not correct, because the present overlapped section of such rock strata has been studied in the Moldovian structure in the GSZ structure, and it refers to the Bug series. However, the genesis of iron-ore rocks is disputable, so the authors consider it undesirable to include them in the CCS of the Ukrainian shield. The genesis of graphitic gneisses and quartzites of the Khaschevato-Zavaliev suite is also disputable, which leads to the conclusion that it should be excluded from the CCS of the Ukrainian shield. With the exclusion of the Zelenolevadov, Bereznin, and Pavlov strata from the Dniester-Bug Series, only the strata of hyperstene and dipyroxene plagiogneisses and crystalline schists, called as Tyvrovka, remains in it. Its stratotype becomes the stratotype of the entire series, so the stratum “Tyvrov rock strata” can also be removed from the series. The authors conclude that the division of the Bug granulite complex into suites and rock strata is impractible. When considering the division of the Bug granulite complex into series, it is shown that the concept “series” as set forth in the Stratigraphic Code of Ukraine, although it does not take into account the features of formation of the Archean series, however does not contradict them. Therefore, separation of the Dniester-Bug and Bug series of different composition and age is quite natural. Contrary to the opinions of some rese
{"title":"Peculiarities of the present structure of the Bug granulite complex developed within the Middle Bug area and its partitioning into series and suits","authors":"O. Gintov, O. Usenko","doi":"10.24028/gj.v44i4.264839","DOIUrl":"https://doi.org/10.24028/gj.v44i4.264839","url":null,"abstract":"The Gaivoron-Zavalie site and the Golovanevsk suture zone (GSZ) of the Bug mining region (BMR) in the Middle Bug region have been a «testing ground» for studying the structure and stratigraphy of the Early Precambrian complexes of the USh for many years. In the article, using their example, the Early Precambrian part of the Correlation Chronostratigraphic Scheme of the USh (CCS USh) and the issues arising around its discussion and the need for changes have been considered here. The main problem is to find out series, formations and rock strata in the CCS of USh, which is quite debatable. It has been shown that some rock strata (leucogranulite formation and Zelenolevadov rock strata, a significant part of the Koshar-Alexandrov suite) refer to the formation-genetic series of quartz-feldspar metasomatites, in particular, to the structural-formation association of metasomatites of zones of regional faults and they are not stratigenic. According to isotope-geochronological data, the bereznin rock strata is not Archean and therefore does not belong to the Dniester-Bug series. The layering, banding and gneissovity of the enderbite-gneiss complex of the Gaivoron-Zavalie section are associated with its intersection of a dense network of fault zones and therefore this area refers to the area of development of highly dispersed metamorphic tectonites, rather than the stratigene rock strata, which some researchers try to call the «Salkovska Formation». The association of the iron-ore strata of the Bug mining region into the Pavlov rock strata of the Archean Dniester-Bug series is not correct, because the present overlapped section of such rock strata has been studied in the Moldovian structure in the GSZ structure, and it refers to the Bug series. However, the genesis of iron-ore rocks is disputable, so the authors consider it undesirable to include them in the CCS of the Ukrainian shield. The genesis of graphitic gneisses and quartzites of the Khaschevato-Zavaliev suite is also disputable, which leads to the conclusion that it should be excluded from the CCS of the Ukrainian shield. With the exclusion of the Zelenolevadov, Bereznin, and Pavlov strata from the Dniester-Bug Series, only the strata of hyperstene and dipyroxene plagiogneisses and crystalline schists, called as Tyvrovka, remains in it. Its stratotype becomes the stratotype of the entire series, so the stratum “Tyvrov rock strata” can also be removed from the series. The authors conclude that the division of the Bug granulite complex into suites and rock strata is impractible. When considering the division of the Bug granulite complex into series, it is shown that the concept “series” as set forth in the Stratigraphic Code of Ukraine, although it does not take into account the features of formation of the Archean series, however does not contradict them. Therefore, separation of the Dniester-Bug and Bug series of different composition and age is quite natural. Contrary to the opinions of some rese","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46255384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.24028/gj.v44i4.264849
K. Kerimova, N.E. Aliyev
Petrophysical properties of reservoir rocks are also influenced by a certain relationship between the lithological-mineralogical composition of rocks and the reservoir properties. For this reason, the study of the relationship between the genesis of Productive Series deposits and reservoir properties provides a basis for predicting the regularity of distribution of sand particles throughout the field and making some judgments about the development of porous and permeability zones. This, in turn, is of more scientific and practical importance while identifying variation of reservoir properties of rocks in sedimentary cover. The paper offers a rational approach that determines the relationship between the genetic origin of sedimentary rocks and their reservoir properties and expounds on the study results. As a research area, we chose «Qirmakiustu clay», «Qirmakiustu sand», Qirmaki and Qirmakialty series of Productive Series sediments studied in sections of conventional X1, X2, X3, X4, and X5 well sections located on one profile of Pirallahifield and their sedimentation environment and facies origin have been studied in more detail. In the section of well under the study, the average value of effective porosity (Kav.p.), average thicknesses of sandy and clayey layers (Hav.cl., Hav.sand), and the relative thickness of sand bodies (Hrel.sand) were calculated for intervals at which the facies of flow, bar, and beach plain origin were identified. The curves of these parameters’ variation across the profile were drawn. At the same time, the curves of thicknesses of flow, bar, and beach plain origin facies were drawn for the interval identified for each well section. These curves were compared and analyzed separately for each facies. A study of the sedimentation environment and genesis of sedimentation and a comparative analysis of lithofacial and reservoir properties may be important for accurately evaluating oil and gas presence in the study area.
{"title":"Study of the interrelation between the geneseses and reservoir properties of productive series deposits in Pirallahi field on the basis of oil-field geophysical data","authors":"K. Kerimova, N.E. Aliyev","doi":"10.24028/gj.v44i4.264849","DOIUrl":"https://doi.org/10.24028/gj.v44i4.264849","url":null,"abstract":"Petrophysical properties of reservoir rocks are also influenced by a certain relationship between the lithological-mineralogical composition of rocks and the reservoir properties. For this reason, the study of the relationship between the genesis of Productive Series deposits and reservoir properties provides a basis for predicting the regularity of distribution of sand particles throughout the field and making some judgments about the development of porous and permeability zones. This, in turn, is of more scientific and practical importance while identifying variation of reservoir properties of rocks in sedimentary cover. \u0000The paper offers a rational approach that determines the relationship between the genetic origin of sedimentary rocks and their reservoir properties and expounds on the study results. \u0000As a research area, we chose «Qirmakiustu clay», «Qirmakiustu sand», Qirmaki and Qirmakialty series of Productive Series sediments studied in sections of conventional X1, X2, X3, X4, and X5 well sections located on one profile of Pirallahifield and their sedimentation environment and facies origin have been studied in more detail. \u0000In the section of well under the study, the average value of effective porosity (Kav.p.), average thicknesses of sandy and clayey layers (Hav.cl., Hav.sand), and the relative thickness of sand bodies (Hrel.sand) were calculated for intervals at which the facies of flow, bar, and beach plain origin were identified. The curves of these parameters’ variation across the profile were drawn. \u0000At the same time, the curves of thicknesses of flow, bar, and beach plain origin facies were drawn for the interval identified for each well section. These curves were compared and analyzed separately for each facies. \u0000A study of the sedimentation environment and genesis of sedimentation and a comparative analysis of lithofacial and reservoir properties may be important for accurately evaluating oil and gas presence in the study area.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44848122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.24028/gj.v44i4.264842
M. Orlyuk, A. Romenets
The paper presents the results of a study on the possible relationship between the spread of SARS-CoV-2 virus and the Earth’s magnetic field based on an analysis of digital data for 95 countries. Article is based on the statistic data of geomagnetic field and coronavirus disease parameters, which allows, in our opinion, to obtain reliable results of their interpretation, which are as follows: The dependence of the spatial expansion of the SARS-CoV-2 virus on the value of modular values of the induction of the Earth’s main magnetic field BIGRF is established. The maximum number of diseases occurs in countries located in regions with reduced (25.0—30.0 mkT) and increased (48.0—55.0 nT) values. The SARS-CoV-2 virus expansion of the dynamics of the geomagnetic field over the past 70 years dependence is established. Maximum diseases number refers to areas with maximum changes, in the direction of decrease (up to –6500 nT) and increase 2500 nT). Comparison of SARS-CoV-2 disease expansion dynamics with Кр-geomagnetic field perturbation index — shows the practical absence of such connection. The ratio of the maximum daily growth of diseases to the minimums of external geomagnetic activity detected. This ratio may be due to the intensity of galactic cosmic radiation increase during this period. The connection between the SARS-CoV-2 disease process dynamics and solar activity is shown, namely: the beginning of a pandemic is due to the superposition of minima of 11 (between 24 and 25) and 110 (120?) solar activity annual cycles. The increase of diseases number correlates well with the increase of the 25th cycle solar activity. The Spanish pandemic was characterized by a similar ratio, which arose about 110 years ago between 14—15 cycles and took place during the 15th cycle of solar activity growth phase.
{"title":"SARS-CoV-2 virus spreading in depending of the Earth’s magnetic field","authors":"M. Orlyuk, A. Romenets","doi":"10.24028/gj.v44i4.264842","DOIUrl":"https://doi.org/10.24028/gj.v44i4.264842","url":null,"abstract":"The paper presents the results of a study on the possible relationship between the spread of SARS-CoV-2 virus and the Earth’s magnetic field based on an analysis of digital data for 95 countries. Article is based on the statistic data of geomagnetic field and coronavirus disease parameters, which allows, in our opinion, to obtain reliable results of their interpretation, which are as follows: \u0000The dependence of the spatial expansion of the SARS-CoV-2 virus on the value of modular values of the induction of the Earth’s main magnetic field BIGRF is established. The maximum number of diseases occurs in countries located in regions with reduced (25.0—30.0 mkT) and increased (48.0—55.0 nT) values. \u0000The SARS-CoV-2 virus expansion of the dynamics of the geomagnetic field over the past 70 years dependence is established. Maximum diseases number refers to areas with maximum changes, in the direction of decrease (up to –6500 nT) and increase 2500 nT). \u0000Comparison of SARS-CoV-2 disease expansion dynamics with Кр-geomagnetic field perturbation index — shows the practical absence of such connection. The ratio of the maximum daily growth of diseases to the minimums of external geomagnetic activity detected. This ratio may be due to the intensity of galactic cosmic radiation increase during this period. \u0000The connection between the SARS-CoV-2 disease process dynamics and solar activity is shown, namely: the beginning of a pandemic is due to the superposition of minima of 11 (between 24 and 25) and 110 (120?) solar activity annual cycles. The increase of diseases number correlates well with the increase of the 25th cycle solar activity. The Spanish pandemic was characterized by a similar ratio, which arose about 110 years ago between 14—15 cycles and took place during the 15th cycle of solar activity growth phase.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47034970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.24028/gj.v44i4.264844
L. Pysarenko, S. Krakovska
The paper is dedicated to the impact of partial deforestation on sums of precipitation and part/fraction or sums of precipitation intercepted by the canopy; total soil moisture content under condition of minimal anthropogenic influence for the territory of Ukraine. In this work used data from the Land Use Model Intercomparison Project (LUMIP), which is based on Global Climate Models (GCMs). The purpose of LUMIP is to reveal patterns of changes of climate characteristics due to gradual global deforestation with a trend approximately 1 % every year and its replacement on grass or pastures for period 1850—1899. This time span is considered as the pre-industrial. The next period, 1900—1929 is without changes in forest cover. For estimation of impacts of partial deforestation the methods of anomalies over the first 20-year period (1850—1869) was used with further application of 5-year running mean of climatic characteristics to smooth their interannual variability. Coefficients of linear correlation between running mean anomalies of specific characteristic and the percentage of forest cover in grid cells with averaging over latitudinal zones, linear trends and differences were estimated. Overally estimations have shown that the global partial deforestation doesn’t impact directly on of monthly total precipitation in the middle latitudes, particularly, in Ukraine. But gradual forest reduction decreases part or fraction of precipitation intercepted by the canopy in both cold and warm seasons with average trend up to –2,6....–1,5 %/10 years in latitudinal zones in specific grids, where forest cover was reduced. The maximal decline was up to –14.5 % in grids as the difference between the 50-year period of partial deforestation and the next 30-year period. Such an effect will causemore precipitation reaching the ground and most likely will influence surface runoff. Found, that it causes the increase in total soil moisture content with trend 0.1—4.9 %/10 years depending on month and climate model, but with most significant changes during summer and autumn seasons. Thus, the analysis of LUMIP data for Ukraine has revealed that the partial deforestation caused the decrease of fraction part/fraction of precipitation intercepted by the canopy. Most GCMs demonstrated that this reduction provoked the increase of total soil moisture content and also can cause changes in hydrological regime and provoke higher flood frequency and other related hydrometeorological hazards in the forest part of Ukraine.
{"title":"The influence of partial deforestation on moisture regime: sums of precipitation and total soil moisture content for the territory of Ukraine based on data of numerical experiment LUMIP","authors":"L. Pysarenko, S. Krakovska","doi":"10.24028/gj.v44i4.264844","DOIUrl":"https://doi.org/10.24028/gj.v44i4.264844","url":null,"abstract":"The paper is dedicated to the impact of partial deforestation on sums of precipitation and part/fraction or sums of precipitation intercepted by the canopy; total soil moisture content under condition of minimal anthropogenic influence for the territory of Ukraine. In this work used data from the Land Use Model Intercomparison Project (LUMIP), which is based on Global Climate Models (GCMs). The purpose of LUMIP is to reveal patterns of changes of climate characteristics due to gradual global deforestation with a trend approximately 1 % every year and its replacement on grass or pastures for period 1850—1899. This time span is considered as the pre-industrial. The next period, 1900—1929 is without changes in forest cover. For estimation of impacts of partial deforestation the methods of anomalies over the first 20-year period (1850—1869) was used with further application of 5-year running mean of climatic characteristics to smooth their interannual variability. Coefficients of linear correlation between running mean anomalies of specific characteristic and the percentage of forest cover in grid cells with averaging over latitudinal zones, linear trends and differences were estimated. \u0000Overally estimations have shown that the global partial deforestation doesn’t impact directly on of monthly total precipitation in the middle latitudes, particularly, in Ukraine. But gradual forest reduction decreases part or fraction of precipitation intercepted by the canopy in both cold and warm seasons with average trend up to –2,6....–1,5 %/10 years in latitudinal zones in specific grids, where forest cover was reduced. The maximal decline was up to –14.5 % in grids as the difference between the 50-year period of partial deforestation and the next 30-year period. Such an effect will causemore precipitation reaching the ground and most likely will influence surface runoff. Found, that it causes the increase in total soil moisture content with trend 0.1—4.9 %/10 years depending on month and climate model, but with most significant changes during summer and autumn seasons. \u0000Thus, the analysis of LUMIP data for Ukraine has revealed that the partial deforestation caused the decrease of fraction part/fraction of precipitation intercepted by the canopy. Most GCMs demonstrated that this reduction provoked the increase of total soil moisture content and also can cause changes in hydrological regime and provoke higher flood frequency and other related hydrometeorological hazards in the forest part of Ukraine.","PeriodicalId":54141,"journal":{"name":"Geofizicheskiy Zhurnal-Geophysical Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48905720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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