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Engineering and Mining Geophysics 2019 15th Conference and Exhibition
- Conference date: April 22-26, 2019
- Location: Gelendzhik, Russia
- Published: 16 April 2019
101 - 110 of 110 results
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Towards the Search for Individual Graves by Electrical Resistivity Tomography (Suzdal Opolie)
Authors I.N. Modin, S.A. Erokhin, A.M. Krasnikova, A.A. Medvedev, A.M. Pavlova, A.A. Pelevin and I.G. ShorkunovSummaryСomplex geophysical studies were conducted with approbation of various methods for measuring and processing data in the search for single burials of the Shekshovo necropolis. The effectiveness of the research was evaluated during the subsequent excavations. The comparison allowed us to draw the following conclusions. Single burials of the studied necropolis are characterized by increased electrical resistivity. At the same time, the contrast of resistance in comparison with the enclosing rocks for single burials is noticeably lower than that of the fillings of the graves and economic holes. This makes the identification of single graves according to geophysics much more difficult than the detection of hidden kurgan rovikov and their remnants and pits of different origin. To single out single burials, a step of 1 m with 2D inversion is insufficient for all observation conditions. Measurements in two polarizations and 3D data inversion allows to increase the resolution of the research. The task of searching for individual graves should be considered as complex, requiring an analysis of the landscape of the monument as a whole, including geological, geomorphological, soil features and a system of agricultural development.
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Airborne Electromagnetic System Equator. the Comparison of Geological Information in Electromagnetic Soundings in Time Domain and Frequency Domain
Authors A.K. Volkovitsky, V.M. Kertsman, J. Moilanen and Y.G. PodmogovSummaryThe results of the combined data processing of the frequency domain and the time domain data is considered. Airborne time domain electromagnetic systems are effectively applied to detection of the good conductor in the relative insulator at a deep depth. But the subsurface part of a section remains poorly explored. Frequency domain systems allow to determine subsurface resistivity in more detail and in a wider range. The simultaneous registration of both time domain and frequency domain data realized in the EQUATOR system significantly expands a class of solvable geological tasks in ore geology, engineering researches and the hydrogeology. Practical survey results with use of the EQUATOR system are given in the conditions of the Angolan shield for kimberlite exploration. Survey works in the Central African ridge area are presented for the solution of a wide range the geological mapping and exploration tasks. The contribution of each method of soundings is estimated for practical result of researches.
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Experience in Designing Facilities for Oil and Gas Complex on Permafrost Soils: Current Problems and Solutions
Authors M.A. Magomedgadzhieva, G.S. Oganov, I.B. Mitrofanov, A.M. Karpov, S.A. Zinakov and N.M. PodolnayaSummaryDuring the development of oil and gas fields development sites in areas of permafrost distribution, an individual approach should be applied to the specific object under consideration, including scientific and technical support of engineering surveys, design and construction.
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Perspective Intervals of Carbonate Section and Their Verifications Based on Geological and Geophysical Data
Authors A.V. Sorokina and E.V. AlynikovSummaryNatural carbonate reservoirs have been studied for a long time and by now a significant amount of research has been done that enlightens various aspects of their productivity. However the problem of studying the potential of carbonate reservoirs is still relevant today. In this paper, an assessment is made of deeply buried carbonate section of the Alturitas oilfield located in the Maracaibo sedimentary basin. The tectonic history of the development of the territory and the sedimentological prerequisites for the formation of hydrocarbon deposits in the section are considered. The initial data for petrophysical studies are given and systematized, the working method and the results obtained are described.
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Influence of the Intrinsic Response of the Measuring System to the Tem Measurement Results
Authors M. Sharlov and N. KozhevnikovSummaryWe discuss decrease in the decay rate of the TEM voltage response in cases when TEM soundings are performed using central loop arrays with small-size transmitter loops. We show that the cause of the slowly decaying central loop TEM voltage response is the intrinsic transient response of the measuring amplifier. This effect is the more noticeable the smaller the transmitter loop and/or the more resistive the ground. The effect is not observed when the receiver loop is located outside the transmitter loop. Inversion of the late time TEM response without regards to the intrinsic response of measuring unit results in appearance of nonexistent conductive ground layers and thus in misinterpretation of the TEM data. To reduce the intrinsic transient response of the measuring amplifier, the following may be useful: reduction of the latest measurement time, subtracting the intrinsic transient response from the total one, disconnection of the amplifier from the receiver loop during the current turnoff in the transmitter loop.
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Electromagnetic Soundings Application to Predict the Velocity Model of A Complex Upper Part of the Section in the South of the Siberian Craton
Authors I. Shelokhov, I. Buddo, A. Pyankov and A. SmirnovSummaryThe geological section of Eastern Siberia is an extremely complex object for a seismic exploration. The reason for this is the extremely high variability of the upper part of the section lithology, rough terrain, and permafrost rocks. This paper delivers an alternative approach to predicting the velocity model of the upper part of the section. The approach is based on the original method of restoring the elastic-velocity characteristics from the data of transient electromagnetic method (TEM) in the near zone.
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2D Inversion of Electrical Resistivity Tomography Data on the Results of Work at Aleksandrovka Training Area
By A. BobachevSummaryIt is shown electrical resistivity tomography data on the results of work at Aleksandrovka training area. The problem of 2D inversion of ERT data is discussed.
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Gravity Anomaly Over the Washout Zone of the St. Petersburg Metro
Authors E. Ermolin and V.N. MelnikovSummaryThe washout zone in the St. Petersburg metro is an accident between the stations "Lesnaya" and "Ploshad Muzhestva." This accident occurred on April 8, 1974. The accident was caused by the impact of quicksand in the tunnels. The washout area was closed twice. The train service was restored on June 26, 2004, when new roundabout tunnels were commissioned. In the summer of 2018, at night, the authors performed the ground gravimetric survey along two profiles (above the old tunnel and above the new tunnel). High accuracy of observations was achieved (3 μGal for gravity survey and 5 mm for referencing absolute values of height). High accuracy allows to use the pickets as the points for gravitation field monitoring. As a result of processing, local anomaly of the gravity field was revealed. The position of the anomaly coincides with the position of the quaternary paleochannel. The width and the morphology of the anomaly made it possible to estimate the parameters of the incision-surface of the paleo-canyon.
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Error Measurement Technique of the Thickness of Road Layers by Using High-Frequency Gpr Antennas
More LessSummaryIn the face of ever risingtraffic flow and the load on the roadbed, the requirements to the quality of newly built and repaired roads are increased. The most important parameter in the roads construction and the quality control is the thickness of the asphalt concrete pavement. For inspection of near-surface layers of the road pavement (layers of asphalt concrete, cement concrete), a GPR with high-frequency horn antenna (from 1,000 MHz and above) in the automotive diagnostic laboratory is most often used. According to SP 78.13330.2012,Highways, the measurement error for the road pavement top layer thickness under non-destructive methods shall not exceed 0,5 cm at a depth up to 10 cm, and 1 cm for monolithic layers at a depth up to 20 cm. In this regard, the issue of high accuracy of the reflecting boundary separation from the asphalt concrete layer base and, thereby, determination of the thickness of the upper structural layers of the road pavement with minimal error is quite important. To study the measurement error in the depth of high-frequency antenna units of the GPR, a series of natural experiments was performed using a special model. As a result of the studies performed it was possible to confirm that the thickness of the layer is determined with high accuracy using a GPR with high-frequency horn antenna unit. The results of the experiment will be used in the future to create an automated metrological model for verification of a vehicle GPR complex used to determine the thickness of the top of asphalt concrete.
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Experience of Deploying Cable-Free Telemetric Seismic System for Fulfilment of 4C-3D Seismic Operations on Shear Waves
Authors A. Turchkov, I. Dubrovin, I. Korotkov, V. Solomatynikov, A. Serov and A. ZinovyevSummaryIn the present study, a field experiment on the fulfilment of seismic reflection works (with common midpoint method modification), carried out at the site of the Department of Geophysics of the Geological Faculty of Moscow State University, is considered. It was performed in Alexandrovka with usage of the cable-free telemetry system "SCOUT". This paper presents the methodological aspects of conducting 3D seismic surveys as well as methodology by which operations were performed and the processing graph of the data obtained.
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