- Home
- Conferences
- Conference Proceedings
- Conferences
Engineering and Mining Geophysics 2019 15th Conference and Exhibition
- Conference date: April 22-26, 2019
- Location: Gelendzhik, Russia
- Published: 16 April 2019
81 - 100 of 110 results
-
-
Assessment of the Impact of Talik Zones on the Development of Mineral Deposits
Authors V. Kozlov, I. Abaturova, E. Zvonarev and E. NugmanovaSummaryThe article deals with the problem of studying the talik zones in the search and development of mineral deposits. The step-by-step method of detection and establishment of boundaries of talik zones with use of a complex of engineering-geological and geophysical methods is described. An example of using this technique at the field of the Okhotsk-Chukotsk volcanic belt is considered.
-
-
-
High-Resolution Vibroseismology on the Mining Field
Authors S. Kolesov, A. Kuzin and V. KondrashkovSummarySeismic exploration is mostly used for prospecting and exploration of hydrocarbon deposits and, to a much lesser extent, for mining objects. For hydrocarbon deposits, the structural factor is dominant; for mining, the problem of determining the zonality of the elastic-deformation properties comes to the fore. The depth of the location of mining objects, the size and nature of their structure lead to the specifics of the method of high-resolution seismic. At one of the mining fields, seismic work was performed according to the method of high-resolution vibroseismology, which included a hi-dense survey, the use of high-frequency vibrators and nonlinear-frequencymodulated sweep-signals. This made it possible to obtain the initial field seismic data with a given operating bandwidth — up to 160 Hz with a high signal-to-noise ratio on all parts of the line with a rather noticeable change in the excitation conditions. The processing and interpretation of the results was carried out in the PRM software (“Parametric scan of reflections”). In the PRM time sections, the nature of the fracturing of the mining deposit is visible, leading to its formation. The PRM allows calculating interval seismic velocities for depth sections, which are used to determine the location of mining deposits. The use of field work on the methodology of high-resolution vibroseismology combined with processing and interpretation of data on the PRM is a progressive and effective method of prospecting and exploration of pyrite mining deposits.
-
-
-
Robust Methods of Determining Target Objects Using Block Structures for Em Data Processing
Authors M. Persova, Y. Soloveichik, D. Vagin, D. Kiselev and Y. KoshkinaSummaryThe paper proposes the approach to increase the reliability of determining target objects locations and their characteristics with the use of geometric 3D-inversion of electromagnetic survey data. This approach is based on the analysis of repeatability of 3D-inversion results for different rotations of the initial model block structures around the vertical axis. The forward problem solution is based on the finite element method on the nonconforming meshes with hexahedral cells, which smoothly approximate the curved surfaces: the Earth relief and subhorizontal borders between the geoelectrical model layers. The possibilities of the proposed approach are demonstrated on synthetic data for a complex multilayer geoelectrical model, which is characterized by the relief and contains lateral complex shape 3D-inhomogeneties overlapping the target object. The numerical experimental results show well the repeatability of conductivity distributions obtained as the inversion result for different rotations of the initial model block structures. This suggests the possibility of reliably determining the target objects in the realistic complex geoelectrical conditions.
-
-
-
The Possibilities of Mine Seismic Survey on Shear Waves
Authors R. Tsarev, A. Prigara and A. ZhukovSummaryWithin the limits of the conducted research the following results have been obtained: 1. It has been established that when conducting seismic surveys of Common Depth Point Seismic Reflection Method (CDP SRM) undermine conditions by vertical–oriented direction of the sensors and vertically directed source of elastic vibrations, the reflection arrives mainly from perpendicular direction from neighbour workings on shear waves; 2. Seismic modelling has shown that the work of Common Depth Point Seismic Reflection Method (CDP SRM) on shear waves has a higher resolution than on compression waves, due to lower velocity and larger amplitude of the registered signal, with that the width of frequency spectrum is the same. Thus, advantages of using the shear waves when conducting the mine seismic surveys are reasonable; 3. It has been established that the signal registered when conducting the mine seismic survey is a result of reflection interference which arrives from two half-spaces, divided with the profile line; 4. A direction for further research has been determined which involves developing a method of the mine seismic survey on shear waves with division of interfering reflections arriving to the receiver line from different sides.
-
-
-
Electrical Properties of Metal Oxides At. № ≤ 20 As Petrophysical, Raw Markers of Quality of Solid Mineral Resources (on the Example of the Ural Deposits of the Upland Type)
Authors A. Timokhin and R.S. TitovSummarySummary: The article Reveals why the development of mineral bases of solid minerals in the current situation with a tendency to mineral depletion is extremely important operational evaluation of commercial raw materials of high accuracy, the only one able to effectively solve the problem of energy and resource conservation in mining, to exclude economic harm from gross errors in the definition of varieties. Taking into account the conditions of the obvious effect of the General spectral nature of the petrophysical methods (measurements and signals), the factors in favor of the key, binding role of electrical conductivity observations (areal Electrometry to a small depth of mountain blocks) to confirm the actual, field data predicted deep inversion of metals properties. The additivity of the sum of oxides: K(+), Ca(2+), Na(+); and, on the contrary, the individual synergy of oxides: Mg(2+), Al(3+), we found, but not found in the known models of semiconductors: synthesis and minerals. On the examples of chemical types of poor raw materials and contacts changing in the deposits of various minerals the prospects of complex measurement algorithms with possibly implemented in the interpretation of approaches to the identification of metals (oxides) as markers of quality and enrichment are assumed. Application variants of use and results are briefly given. Keywords: losses of solid minerals, re-grading, raw materials assessment, semiconductor markers in electrical conductivity, electrometry, exploration and calculations of enrichment, energy- and mineral-saving.
-
-
-
The Dominant Frequency of the Elastic Wave at the Engineering Seismic Survey with Shock and A Pneumatic Source of Vibrations
Authors P. Kondratenko and O. VoronkovSummaryThe report presents the methodology and results of geophysical studies by seismic exploration on ground hydraulic structures. The aim of the work was to evaluate the effectiveness of the use of pneumatic sources of elastic oscillations in comparison with shock sources. As a result of research on various sites and in different soil conditions was obtained information about the prevailing frequencies of longitudinal waves with different mode of excitation of elastic vibrations in the environment and conclusions on the applicability of the air gun subarray in engineering seismic prospecting.
-
-
-
Results of Frequency Electromagnetic Soundings on the Chernorud-2 Area in the Valley (or the Plot of Land) Burun-Khal
Authors D.A. Skrypnichenko, Y.A. Davydenko, S.V. Snopkov and A.V. KharinskySummaryThe purpose of this work is to test the Nemfis electromagnetic scanner on the archaeological survey of Priolkhonia (western Baikal region). Frequency electromagnetic sounding method, implemented in Nemfis scanner, intended for research positional relation electrical resistivity to a depth of 10 m. Relevance of the work is to evaluate the applicability of frequency electromagnetic sounding for mapping the near-surface section for solving archaeological problems in conditions of significant conductivity contrast of the earth material, lying in the foundation. In the summer of 2017, work was field trial work the purpose of which was to the effect extraction of a thin near-surface layer of the purpose of which was to isolate the effect of a thin near-surface layer of quaternary deposits on the background of significant anomalies caused by contrasting conduction primary rocks. Researches were conducted in the plot of land Bul-Durun near the student practice base of INRTU "Chernorud" (Shara-Togot village, Olkhon district, Irkutsk region).Detailed exploratory survey with a step of one 1 m. per 1 m. was performed on a reference area of 100 m. per 40 m. (Fig. 1). Areal survey data were processed using the program GeliosSMI-64 [ 1 ]. In progress of processing, using regression analysis was minimized background effect from rocks with contrasting conduction and near-surface anomalies were isolated, including from archaeological objects. As a result of experimental work has been developed processing technology of areal data frequency scan to detect weakly contrasting archaeological objects in the background of significant influence of bedrock.
-
-
-
Three-Dimensional Measurements by Standard Equipment of Ert Method on Multi-Segment Area Arrangements of Electrodes
Authors D. K. Bolshakov, K.D. Efremov and I.N. ModinSummaryThe report presents area multi-segment arrangements with the number of electrodes significantly exceeding the number of electrodes available for simultaneous switching by multielectrode system for carrying out twodimensional electrical tomography data. However, the proposed measurement method using these arrangements, together with the method of moving them (similar to the roll-along technology), allows us to examine large areas and obtain true three-dimensional data suitable for carrying out three-dimensional inversion. The results of field experimental-methodical work with dipole-dipole and pole-dipole arrays are given. One of the advantages of multi-segment technology for obtaining three-dimensional data is the possibility of using standard system and equipment with a limited number of simultaneously switched electrodes.
-
-
-
Application of Overhauser Magnetometers in the Search for Ore and Placer Gold and Diamonds Deposits
Authors L.A. Muravyev, V.A. Sapunov, E.D. Narkhov and I.M. KhasanovSummaryWe present the results of using modern nuclear precession magnetometers based on the Processor Overhauser Sensor overhead processor POS sensor for the study of primary and loose gold and diamond deposits in various regions of Russia and in the Republic of Angola. The developed method of the pedestrian magnetic survey with the definition of coordinates using a GPS navigation receiver allows you to effectively isolate the field from lowcontrast magnetic objects against the background of more extensive and intensive anomalies of the geological environment. A ground magnetic survey is effective in detailing and sorting out the anomalies detected using aeromagnetic survey when searching for primary and loose diamond deposits. Micromagnetic anomalies detected as a result of detailed shooting in continuous mode make it possible to localize heterogeneities of the geological structure in the upper part of the section.We present the results of using modern nuclear precession magnetometers based on the Processor Overhauser Sensor for the study of ore and placer gold and diamond deposits in various regions of Russia and in Angola. The developed method of the ground magnetic survey with GPS navigation receiver allows you to effectively separate the field from low-contrast magnetic objects on the background of more intensive anomalies of the geological environment. A ground magnetic survey is effective in detailing and separating the anomalies detected using aeromagnetic survey. Micromagnetic anomalies makes possible to localize geological structures in the upper part of the geological section.
-
-
-
Perspectives of Gpr Application in the Geophysical Complex for Prospecting and Exploration of Alluvial Gold Deposits
Authors I.M. Hasanov and L.A. MuravyevSummaryOne of the ways to improve the mining and geological work at placers is a wider application of geophysical research, the role of which is currently clearly insufficient. We propose the complex of geophysical investigations to solve problems arising from prospecting gold deposits of various morphogenetic types. Depending on the tasks, it may include georadar sensing, electric profiling, electric sounding and magnetometric survey. In the course of the work, it was found that the most effective (in terms of productivity and costs) type of electrical exploration, especially when solving problems related to the evaluation of loose sediment thickness and determining the morphology of a hard base relief, is GPR profiling. Geophysical work was carried out at several test sites in the Magadan region, the Northern Urals and the Republic of Tanzania where industrial mining of placer gold is planned. This complex is quite efficient and cheap and can be recommended before specifying the specific boundaries of landfill mining sites.
-
-
-
Numerical Simulation of the Resistivity for A Homogeneous Half-Space with Relief
Authors K.I. Baranchuk and I.N. ModinSummarySometimes, using ERT method on high relief slopes which occur in mountainous areas, during archaeological and engineering investigations, there are appear some anomalies on inversion images which may identify as features. They are located either under the bend of the relief, or in the lower third of the image. These anomalies can several times exceed the background values of the apparent resistivity. We decided to call them Pr and Cr effects, because on sections of apparent resistivity they are similar to the already familiar anomalies from near-surface heterogeneity, which are commonly called P and C effects. We used programs of numerical solution of forward modeling to analyze the properties of Pr and Cr effects: IEMoutput2 and ZondRes2D. We used an analytical solution of one of the models for verifying results. Model with a single smooth inflection was used as a transition from the elementary form of the relief to the real one. The article shows the differences in the results of numerical simulation in different programs. It may be the possible reason for the insufficient inclusion of relief effects on the results of inversion are indicated.
-
-
-
The Results of High-Precision Magnetic Survey at An Archaeological Site, Janken (Kazakhstan)
Authors I.N. Modin, M.V. Kosnyreva, L.A. Zolotaya, A.Y. Palenov and T.V. TopilinaSummaryThe article is devoted to the results of the interpretation of data of high-precision magnetic surveys conducted on most of the archaeological site of Jankent from 2011 to 2018. According to the results of the interpretation of magnetic data, it was possible to classify local anomalies and associate them with various types of archaeological objects. By the linear negative anomalies (-5 -20) nT extended in the submeridional and sublatitudinal directions fragments of the internal layout of the hillfort were traced. By the results of the analysis of various transformations of the anomalous magnetic field and the solution of the inverse problem, conclusions were made about the localization of the sources of anomalies in the depth range from 0.6 meters to 1.4 meters. Magnetic modeling allows us to conclude that sources of intense magnetic anomalies are likely to be foci or furnaces. The results will be verified by archaeologists in the course of further research.
-
-
-
The Research Ore Body’S Geoelectric Properties In-Situ with System Ems-Ip
Authors S.V. Bukhalov, Yu.A. Davydenko, A.S. Bashkeev and K.V. AbornevSummaryOre body’s profile was measured with small-step system in the Turavity area (Altai Republic) to research the near-surface occurrences in-situ with electromagnetic sounding and induced polarization technology (EMS-IP) in October 2016. This profile located in combined delve (bulldozer and manual) with outcrop ore body. Earlier this profile had measured with geochemical testing. Zones of high and low polarizability were identified as a result of geophysical measurements with grounding into the ore body. These zones correlate with high copper and silver content’s zones which were obtained by geochemical testing. In results of the research we can conclude that this measurement technique is a good addition to the areal surveys modeling.
-
-
-
The Results of the Use of Compact Shallow Contactless Equipment in the Study of the Foundations at the Intersection of B.Dmitrovka and Kamergersky Lane, Moscow
Authors D. Romanov and D. FadeevSummaryThe paper presents the results of the study of the structure of the basement using non-contact methods. According to the work carried out, maps and sections of the distribution of the module and signal components of the apparent resistivity measured by induction equipment were constructed. On the maps and cuts revealed anomalies caused by the presence of changes in the structure of the medium. On the basis of the conditions and possibilities of conducting research, the boundaries of the foundation were partially confirmed. The nature of the signal in the zones of contrasting anomalies indicated above indicates the presence of conductive objects, which may also include reinforced concrete structures. Overlaying a priori information with the obtained geophysical data makes it possible to compare the layout of the building on the ground.
-
-
-
Assessment of the Influence of Metasomatism Processes on the Formation of the Physicomechanical Properties of Rocks
Authors O. Borisikhina, I. Abaturova, I. Savintsev and V. KozlovSummaryThis article discusses the metasomatic zonality of the Svetloye deposit, the effect of the degree of metasomatic development on the formation of physical and mechanical properties. The fields of distribution of indicators of physicomechanical properties are constructed, their comparative analysis with geological boundaries is carried out. The influence of the mineral composition on the physicomechanical properties was evaluated. A paired correlation analysis was performed.
-
-
-
Application of Cdp Seismic Reflection Method in Buried Paleo-Valley Study
Authors G. Gorelik, L. Budanov, D. Ryabchuk, V. Zhamoida and I. NeevinSummarythe paper presents the results of the paleo-valleys study using CDP seismic reflection method. The purpose of ancient rivers valleys studying is relevant in the north of the Leningrad Region due to the weak stability of the rock in the area of the paleo-valleys location and the high risk of structural damage during the construction of multi-storey buildings. In addition, in connection with the prospects for detecting drinking water supplies in sandy sediments filling the paleo-valley, mapping and reservoir capacity estimation may be useful for choosing sources of water supply for nearby settlements (Sestroretsk, Solnechnoye village).
-
-
-
Search for Concealed Copper-Molybdenum Mineralization in Northern Kazakhstan with the Help of Electromagnetic Sounding Technologies and Induced Polarization (Ems-Ip)
SummaryCurrently, more than 65% of world reserves of copper and about 60% of its world production, as well as more than 60% of molybdenum reserves and about 70% of its production occur in so-called copper-molybdenum porphyry deposits of hydatogenesis. These deposits are characterized by large accumulations of milling-grade ores, represented by systems of fine ore veinlets and small impregnations of sulfide ore minerals, among which chalcopyrite and molybdenite are widespread. The largest industrial deposits of this type are in Kazakhstan. The paper provides an assessment of the sensitivity of measured transients to changes in electrical resistivity and polarization, which makes it possible to separately determine the distribution of these parameters in the medium, as well as a comparison of the results of the inversion of pulsed electrical survey data with the geology of the area under study.
-
-
-
Field Experement with New Vibrosource Type
Authors V. Serebryakov, I. Korotkov, A. Zhukov and A. SolovyovSummaryVibrosies exploration seismology is leading geophysical method. The Recent hardware and technology developments allow seismic acquisition for detail near surface imaging. The light seismic vibrator driven by linear synchronous motor may serves as an alternative to hammer or standard heavy hydraulic vibrosource for shallow depth engineering studies. Advantages of electric vibrator includes wider output signal spectrum (up to 1KHz), shear wave mode operations with all kinds of comprehensive signals such as pseudorandom , adaptive and broadsweep sweep signals. The first field experiment with lightweight vibrosource was carried out in urban environment of Moscow City. Results of field experiment and data processing are presented in this paper.
-
-
-
The Experience of Application of 2D Transition Zone Seismics for the Leveling of Land and Marine Data Obtained at the Bridge Construction Site
Authors A. Turchkov, A. Oshkin, V. Ignatev and A. KonkovSummaryThis paper is based on shallow 2D transition zone seismic data obtained during geo-technical survey at the bridge construction site. The transition zone measurement technique as well as data processing approaches and main results are presented in the paper. The equipment and survey technique complex that has been used in the survey makes possible all geophysical tasks to be solved. Thus, it could be recommended as an optimal for further application in similar geological conditions.
-
-
-
Modeling of Deep Sections Based on the Gpr Results
Authors E.Y. Girenko, I.O. Dubrovin and I.N. ModinSummaryIn some cases, the upper part of the section is represented by sands with a certain amount of coarse clastic material in the form of blocks measuring 30–100 cm. For an antenna of 250–300 MHz, the center frequency of the spectrum of the reflected signals is 180–200 MHz. It is easy to calculate that at a velocity 10 cm / ns, the wavelength will be about 0.5 m. This is the optimal size of the heterogeneity at which diffraction is formed in the form of a hyperbolic reflection on a georadarogram. If the block material is scattered evenly throughout the section, you can try to determine the effective propagation velocity of electromagnetic signals for different depths and more accurately recalculate the time section into a deep one. In this paper, an example of the results obtained at the Aleksandrovsky Plateau in the area of the geophysical test site of Moscow State University in the Kaluga region considers an algorithm for recalculating time sections into deep ones taking into account the use of multiple hyperboles from diffraction points. For sandy - gravel soils containing single boulders and large blocks, it is possible, using hyperbolic reflections from diffracting objects, to construct a model of a velocity section. Further transformations make it possible to change time boundaries into deep ones and build deep sections, which take into account the change in velocity with depth.
-