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Engineering and Mining Geophysics 2018
- Conference date: April 23-27, 2018
- Location: Almaty, Kazakhstan
- Published: 23 April 2018
21 - 40 of 149 results
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Combined Investigation by Thermal Imaging and Georadar Scanning for Voids Detection under Reinforced Concrete Slabs of Fastening Soil Slopes of Hydraulic Structures
Authors V.V. Glazunov, V.G. Shtengel, V.S. Nedyalkov, N.N. Efimova and S.M. DanilevSummaryThe technique of identification and size determination of voids under the reinforce-concrete plates of canals and dams is developed. This method is based on combined investigation by thermal imaging and georadar scanning. The results of mathematical and physical design of georadar effects of cavities are presented. The results of experimental researches of well-known cavities are given.
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Determination of the Location of Pipelines by the Method of High-precision Magnetometry in Engineering and Environmental Surveys
Authors L.P. Parfenova, A.I. Semyachkov, V.E. Petrov and A.A. KoshelnikSummaryGeophysical work performed by the method of high-precision magnetometry in difficult industrial site conditions allows solving problems on revealing the places of laying buried pipes and other ferro-concrete and iron structures.
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The Use of Geophysical Research Methods for Obtaining Hydrogeological Information Within the Engineering-geological Survey
Authors L.P. Parfenova, A.I. Semyachkov, V.V. Kuchin and A.V. KlimshinSummaryAs a result of the work, it was possible to track the area occupied by the dump of the stale oxidized and mixed ore, that the main aquifer of groundwater is confined to the weathering crust of the bedrock, for which the monolithic gabbro serves as a water repellent. Research methods - vertical electric sounding (VES) and audio-magnetotelluric (AMT) measurements in the version of electrical profiling and sounding.
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Experience in the Use of Geophysical Studies for the Management of Geoecological Conditions in a Field Practiced by the Method of Underground Leaching
Authors L.P. Parfenova, A.I. Semyachkov, V.A. Pochechun and V.V. BodinSummaryGeophysical studies using the seismic method were carried out to detect old mine workings that were completed during the initial development of the deposit, on the border with the site of the cryolite plant. Geophysical studies using the seismic method carried out on the territory of the deposit made it possible to identify and tamp down old mountain areas, reduce the risks of formation of unplanned leaks of productive solutions, and also generally improve geo-ecological conditions in the mining area.
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The Use of Geophysical Studies to Solve the Problem of Additional Drainage of the Quarry (on the Example of the Northern Copper-zinc Mine)
Authors L.P. Parfenova, A.I. Semyachkov, M.V. Arkhipov and V.V. BodinSummarySeismic studies to identify tectonic disturbances as potential zones of increased water conductivity were carried out using the seismic profiling method. The physical prerequisite for the application of the seismic method for the detection of tectonic disturbances is the seismic wave field reaction to the change in the physicomechanical properties of the fractured rocks in the zone of influence of the breaking disruption. As a result of the use of geophysical surveys performed by the method of seismic profiling, areas of increased water conductivity were identified on the southern side of the SMRR quarry.
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Electrical Resistivity Tomography of the Flangs Quartz-gold-sulfide Deposits: The Experience in Eastern Sayan (Russia)
Authors V.V. Olenchenko, A.N. Shein and A.S. KalganovSummaryIn the mountainous conditions of the Eastern Sayan on the flangs of one of the quartz-gold sulfide deposits, electrical exploration was performed using the method of electro resistivity tomography with measurement of the induced polarization. The main goal of the research is mapping of ore control structures and tracing them to depth. With the help of special devices, the step between electrodes from 5 to 10 m was increased with the use of standard cables. This made it possible to obtain a geoelectric model to a depth of 200–230 m. Known ore control zones of cataclasis and mylonitization are traced by linear anomalies of low electrical resistivity. In the near-contact parts of these zones, an increased polarizability of rocks associated with sulfidization is established. A geoelectric anomaly was discovered, interpreted as an unknown ore zone.
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Using Unmanned Aerial Vehicles in Aerogeophysics
Authors G. Trigubovich, S. Shevchuk, S. Barsukov, V.N. Nikitin and S.A. ArbuzovSummaryThe article presents a review and analysis of the prospects for the use of unmanned aerial systems (UAVs) for aerogeophysical studies. The requirements for unmanned aerial systems used for geophysical surveying and for surveying equipment are determined. Recommendations for the selection of unmanned aerial systems for the geophysical survey tasks are given. The conclusion made that the most optimal class of unmanned aerial systems for geophysics are aerodynamic class of devices which include aircraft and rotor UAVs. The current experience of using unmanned systems in aerogeophysics in Russia and abroad is considered. Also, modern problems of unmanned aerial systems are considered: the questions of the legal issues of using UAVs, as well as the problems of power supplies and the reduction of economic efficiency when increasion the area of work.
A conclusion is made about the high relevance and prospects of this direction in aerogeophysics.
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Use of Geochemical Prospecting and Evaluation Methods in the Potentially Oil-rich Territories
Authors T.S. Bobina, V.B. Boltyrov and S.G. PanyakSummaryThe analysis of existing geochemical methods of search and prediction of hydrocarbon deposits is given. A critical analysis of existing methods of forecasting oil and gas fields, the recommendations sequence geochemical reference works was made. Specificity of the most effective technologies of the two organizations used today JSC “NPC Geokhimiia” (Russia) and “Petro Geokhim Service” (Germany) was defined. The possibility of modernizing and optimizing existing methods, reducing the cost of field work and analysis is shown. The mathematical apparatus used to create predictive maps on carbonaceous materials is considered. The high quality of the analytical data produced by “Petro Geokhim Service” was noted, which can serve as a reliable basis for mapping the forecast. Practical recommendations on the location of surface geochemical survey in the complex hydrocarbon exploration in general were given; the optimal network testing was proposed and the conclusion about the possibility of a significant reduction in the list of analyzed hydrocarbons was made.
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A Comprehensive Airborne Geophysical Survey in the Localization of Gold Objects of Different Types
Authors M.G. Pustozerov and G.M. TrigubovichSummaryThis article discusses the criteria for the allocation of gold objects in different geological settings. The ideology of the interpretation is based on physical and geological model of the gold mineralization in cernoslancevyh reservoirs, taking into account the private factors. Are examples of deposits in geophysical and radiochemical fields in North-East Russia.
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Modern Processing Techniques of Shallow Marine Seismic Surveys
Authors S.A. Vakulenko and S.V. BuryakSummaryShallow marine seismic acquisitions are widely used for geohazard seismic assessments, platform site surveys, top-well drilling site investigations, 4D reservoir characterization and other studies.
Modern shallow marine seismic acquisition approaches require complex state-of-art processing techniques. Broadband frequency range, short offsets, shallow towing of receiver spread and other data acquisition aspects complicates data processing significantly. In the article we will consider high resolution shallow seismic marine statics, deghosting, designature, multiple elimination and 3D regularization aspects, required to cover all shortcomings, related to the acquisition aspects.
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Sunnyside Deposit: A Calibration Site for Airborne EM Systems
Authors A. Viezzoli, A. Menghini, G. Selfe and V. KaminskiSummarySunnyside deposit (Botswana) has been heavily studies using a number of geophsical methodologies, including TEM, AMT and four airborne EM systems. Therefore, it became a de-facto calibration site for airborne EM systems and current paper is showing the result of inverse modelling verified against the drilling data.
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Modern Electro-prospecting Technologies for Searching and Exploration of Ore Deposits
Authors V.A. Kulikov, S.V. Zaytsev and A.G. YakovlevSummaryThere has been a qualitative improvement of existing technologies and the emergence of completely new geophysical techniques. New directions in ground-based electrical prospecting are associated with the development of audio-magnetotelluric sounding, magnetovariance techniques, electromotography, spectral induced polarization, etc.
The use of powerful and fast computers significantly reduced the time of processing and interpretation of electro-prospecting data, and made it possible to move to a qualitatively new level of 2D and 3D interpretation of the results.
A new technique for ground-based electro-tomography was developed, using asymmetrical axial installations, to solve ore problems with a depth of 400–500 m. The technique was successfully tested on copper-porphyry, skarn, and polymetallic deposits.
An advanced technology was proposed for using multifrequency measurements of the differential phase parameter of the IP for solving important geological problems of ore geophysics: separation of anomalies of SP from carbonaceous, graphitized rocks and sulphide ores, etc.
A new technique for inter-well electrotomography (IWE) has been developed. A successful field testing of the method at the Norilsk ore deposit was carried out.
The introduction of magnetotelluric methods into the ore geophysical complex increased the depth of electrical exploration and made it possible to identify deep-lying large deposits.
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On the Feature of Two-phase Filtration in a Porous Medium Under Elastic-wave Action
Authors E.A. Marfin, A.A. Abdrashitov, R.N. Gataullin and A.G. GavrilovSummaryThe method of developing oil deposits, based on the injection of water into the reservoir, does not allow the extraction of oil from the bowels completely. This is due to the Saffman-Taylor instability phenomenon. The effect of superimposed nonstationary flow on the stability of the interface between two liquids (water and oil) is theoretically considered in the work. It is shown that there is a critical wave number, beyond which the interface of liquids is stable without the formation of "tongue". To confirm theoretical conclusions, it is necessary to establish and conduct experimental studies in a wide frequency range.
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Three-segment Technique of Electrical Resistivity Tomography and Results of Studies of the Moskva-river Valley Near Zvenigorod Biological Station of Moscow State University (Lucino, Moscow Region)
Authors D. Bolshakov, I. Modin, K. Efremov and T. TopilinaSummaryResults of experimental and methodical works with application of a three-segment technique of Electrical Resistivity Tomography are presented in the message. Measurements are executed on the land and on the water area of the river along one profile by a uniform technique. Field data with maintaining detail, uniform, continuity and depth along the entire profile of observations 1300 meters long are obtained.
The three-segment technique possessing with increased depth of research in comparison with the generally accepted two-segment standard technique is described. The results of the 2D inversion satisfactorily agree with the geological information on the structure of the river valley. By results of the analysis and interpretation of a section of electrical resistivity the main elements of the river valley structure were identified. Information about the properties and geometry of deposits of the of the river valley can be used to construct the initial geoelectrical model, but it is preliminary and requires specification.
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Magnetic Properties of Ancient Pottery
Authors S. Shakuro and V. PanchenkoSummaryThe portable magnetic susceptibility kappa-meter PIM-V was used in the study of 42 pottery samples collected in the Chora of Chersonesos. The achieved measurement error was well under the range of the measured values, so it proves that the magnetic susceptibility measurements are applicable for pottery classification. Presumably, intrinsic magnetic susceptibility of pottery is most affected by the number and the material of black-colored inclusions. In 2016, the suggested methodology of magnetic susceptibility measurements was applied to investigate the possibility of applying magnetometer survey for finding and siting the ancient underground ceramic water conduit.
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Application of a Complex of Geological and Geophysical Methods for the Search for Water in Arid Regions of South Africa (Madagascar). Survey of Maar Structures
Authors I. Zuikov, M. Burr and Y. PogorelovSummaryThe report presents the results of the application of a complex of geological and geophysical methods (lineament analysis, radiometric survey and geoacoustics) in the search for fresh water sources in the arid regions of southern Madagascar. The peculiarities of the complex used, research equipment, examples of the implementation of the research and examples of recommendations for drilling based on the results of the applied methods are considered.
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Integration of the AMT in Ls-epithermal Au-ag Veins Exploration in Chukotka Region
Authors E. Ermolin, O. Ingerov and A.A. SavichevSummaryThe goal of the investigation is to prospect the north extension of the epithermal quartz gold-bearing vein. The object is located within the Kimmerides of the Okhotsk-Chukotka volcanic belt. The vein is 500 meters long and 3 meters wide. It is covered by 100 meters of volcanic rocks. The complex of geophysical methods was applied (audiomagnitotelluric sounding (AMT), Magnitovariational profiling (MVP), ground gravity and magnetic survey).
Field works showed that the main vein is appeared in geophysical methods as the zone of: increased values of resistivity, the zone has a deep channel; increased values of invariant phase; increased values of the gradient of tipper phase; increased values of the gradient and negative local anomalies of the gravity field; decreased values of the effective magnetization. The indicated features can be called as the “Geophysical structural prospecting criteria”. The regular alteration of the chemical element associations are observed from the South to the North: sub-ore (Mo-Cu) → ore (Au-Ag-As) → supraore (Sb-Hg).
The physical-geological model of the epithermal quartz gold-bearing vein was suggested. The position of the North end of the vein was predicted as a result of the integrated data analysis. This position was later confirmed by drilling.
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3D Interpretation of AEM Data With IP Effect in EM-DataProcessor Software
Authors A. Chernyshev, A. Kuklin, G. Trigubovich and E. GoncharovSummaryIt is shown that in the AEM surveys the measurement of signals with two spaced in height receivers significantly reduces the equivalence of the solution and allows to separate the induction and polarizing components of the measured signal much more confident. In the absence of obvious signs of polarization its presence can only be determined with the use of dual measurements, otherwise the signals will be wrongly interpreted. Interpretation technology, based on the separation of the polarization and induction components of the measured signal with the subsequent 3D inversion in EM-Dataprocessor software allows to significantly increase the accuracy of the interpretation and increase the probability of target objects detecting. The results of experimental AEM research using VTEM and “Impuls-A-7” systems are presented.
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On the Realization of Seismic Microzoning of Almaty in Ground Accelerations Based on the “Continual” Approach
Authors N.V Silacheva, U.K. Kulbayeva and N.A. KravchenkoSummaryProbabilistic seismic micro-zoning of Almaty in ground accelerations was carried out with implementation of the continual approach proposed by A.S. Aleshin to account for site category effect on ground motion. The chosen approach made it possible to avoid recalculating accelerations into macro-seismic intensity and back, to avoid the traditional discrete representation of continuous parameters, and to proceed to a direct calculation of resulting accelerations on the base of seismic rigidity obtained with engineering-geological and instrumental geophysical surveys. The developed maps are at the stage of discussion and preparation for further introduction into the normative documents of the Republic of Kazakhstan.
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Results of High-resolution 3D Seismic Application for Kimberlites in Yakutia
Authors V.M. Boyarov, E.M. Goncharov and G.S. EgorovSummaryThe search conditions for new diamond deposits over time are increasingly complicated, the thickness of overlapping sedimentary rocks increases and the size of search objects decreases. To effectively solve search problems in the set of kimberlite searching methods, the role of remote geophysical methods, including 2D and 3D seismic, is increasing. An article presents the technique of high-resolution 3D seismic survey and some results of 3D seismic survey on kimberlite bodies in the conditions of the Yakutian diamond province. On actual examples, the methodical efficiency of 3D seismic exploration is confirmed for the search for low contrast and small-sized kimberlite bodies.
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