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Date submitted2020-05-28
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Date accepted2021-07-27
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Date published2021-10-21
On the applicability of electromagnetic monitoring of hydraulic fracturing
The purpose of this work is to assess the possibilities of using electromagnetic monitoring to study the development of a fracture system generated by hydraulic fracturing (HF) with a specified position of the controlled source. The option with the source (a vertical electric dipole) located in the interval of the oil-bearing formation and ground-based measurements was chosen as the most promising monitoring plan. We have built a geoelectric model equivalent to the system of hydraulic fractures, divided into 11 zones corresponding to HF stages. For the selected model, mathematical simulation was performed by solving the direct problem considering the impact of the steel casing, the presence of which reduced the effect. Despite this fact, no strong distortion of electromagnetic field anomaly was observed above the HF zone. Analysis of the simulation results at different HF stages showed that as new hydraulic fractures appeared and were filled with electrically conductive proppant, the total effect increased. The data on electric field anomaly demonstrated maximum deviation from the background level of more than 2 %. Provided that the studied formation is characterized by sufficient electrical conductivity, its magnetic field also becomes informative.
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Date submitted2016-09-21
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Date accepted2016-11-04
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Date published2017-02-22
Combined 2D inversion of electrotomographic and audio-magnetotellurgic sounding data to solve mining problems
- Authors:
- V. A. Kulikov
- A. E. Kaminskii
- A. G. Yakovlev
Electrical methods of exploration are widely applied in prospecting and estimation of ore mineral resources. It is not always that geoelectrical models obtained in the course of interpretation of different types of electric and electromagnetic sounding are in line with each other. This leads to difficulties in geological interpretation of electrical exploration results. In single cases a geological model can be built that with great precision satisfies data from different electrical explorations, for instance, results of geometric and inductive electromagnetic soundings. For this purpose an algorithm of combined inversion of electrotomographic and audio-megnetotellurgic sounding data has been developed and implemented by A.E.Kaminskii in software ZondRes2D. Advantage of combined inversion has been shown for investigation of sections up till 400-500 m deep on synthetic models and actual field data.
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Date submitted2015-12-29
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Date accepted2016-02-21
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Date published2016-12-23
Poorly studied phenomena in geoelectrics
- Authors:
- V. S. Mogilatov
Undoubtedly, modern geoelectric technologies emerge in the result of the development of traditional approaches and techniques. However of more interest is the appearance of completely new technologies based on new effects and new models of interaction of geological medium and electromagnetic field. The author does not commit to indicate principally new directions, but only wants to discuss some poorly known facts from the theory and practice of geoelectrics. The outcome of this study could be considered attracting the attention of experts to non-traditional signals in geoelectrics. The reviewed phenomena of interest, not fully implemented in practice in the author’s opinion, are field split into two polarizations: transverse electric (the ТЕ-field) and transverse magnetic (the ТМ-field), then some poorly known properties of ТМ-field, the role of bias currents, the anisotropy of horizontal resistances, the role of geomagnetic field in geoelectric sounding, the unique resolution of CSEM (Controlled Source Electro-Magnetic) techniques at sea.
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Date submitted2008-10-15
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Date accepted2008-12-17
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Date published2009-12-11
Low frequency inductive airborne electromagnetic system em-4h
Nearly all existing airborne EM-survey systems have been tested in Russian Federation. And for today the most popular EM-system is the frequency-domain one, called EM-4H. The article gives the description of the EM-4H system, that have been developed by «Geotechnologies» JS. This instrument allows effective conductivity mapping on a 1:25000 scale. It provides performing of 100 kilometers of survey per hour on the average.
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Date submitted2008-10-29
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Date accepted2008-12-06
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Date published2009-12-11
Data collection and processing system of low-frequency electrical method with artificial source
- Authors:
- A. I. Geraskin
Review of the basic components of elaborating system is presented. The basic trends of application of these components and software products created on their basis are shown. The concept of a processing graph is entered and shown its dynamic features. Specific examples of the successful practical application of the system are considered.
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Date submitted2008-10-14
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Date accepted2008-12-21
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Date published2009-12-11
Results of profile magnetotelluric researches at the Ozernoye ore cluster in Buryatiya Republic
Primary results of MT profiles surveys interpretation are presented. The investigations have been carried out in 2007. Ozernoye pyrite-polymetallic deposit is of special interest. Magnetotelluric and audiomagnetotelluric investigations have been carried along one profile, crossing all over the territory of Ozernoye ore cluster, and along some more detailed profiles inside already discovered deposits. As a result of the investigations some new data on relict structure, which is the host of Ozernoye pyrite-polymetallic deposit, are obtaned.
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Date submitted2008-10-07
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Date accepted2008-12-05
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Date published2009-12-11
The application of areal technology and 3d data interpretation tem sounding when constructing the volume geoelectrical model of compound medium
Analysis of possibilities of different electrical technologies is carried out. Problems of applications of one-dimension and multidimensional inversions in the process of interpretation are discussed. Example of practical application of two- and three-dimension interpretation of electrical data in the process of ore prospecting in complicated geological media is presented. The example illustrates possibilities of electrical method as original research method, which enables to develop three-dimensional models of the medium under investigation.
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Date submitted2008-10-04
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Date accepted2008-12-13
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Date published2009-12-11
1D-interpretation technology of airborne tem data
- Authors:
- A. V. Chernyshev
One-dimensional interpretation methods of airborne transient electromagnetic data are considered. Main techniques, used for adaptation of standard methods of ground electroprospecting data interpretation to airborne technique, are described. The efficiency of methods examined was analyzed on theoretical data set. An example of practical application of methods developed is presented.
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Date submitted1958-03-28
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Date accepted1958-05-11
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Date published1958-05-09
ОБ УЧЕТЕ ВЛИЯНИЯ ПЛОСКОЙ ЗЕМНОЙ ПОВЕРХНОСТИ В ЭЛЕКТРОРАЗВЕДКЕ
- Authors:
- Unknown
Обычно применяемый в электроразведке постоянным током приближенный способ учета влияния земной поверхности состоит в удвоении значений электрического потенциала, найденного для случая тела, находящегося в электрическом поле в неограниченной вмещающей среде, т.е. при отсутствии границы раздела земля — воздух. В настоящей работе приводится анализ погрешностей, вносимых указанным выше методом учета влияния плоской земной поверхности, для тел правильной геометрической формы. С этой целью для приближенных кривых потенциала, рассчитанных с использованием обычного приема удвоения, подбирается такая форма поверхности тела, для которой решение, полученное путем удвоения, оказывается абсолютно точным.
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Date submitted1954-07-26
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Date accepted1954-09-20
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Date published1955-11-17
Подземная геофизика в горных выработках Урала с целью поисков сульфидных руд
- Authors:
- Unknown
Настоящая статья посвящается разработке вопросов, связанных с поисками электроразведочными методами сульфидных рудных тел, пропущенных и утраченных горными выработками в медных рудниках Урала. В ней дана методика поисков сульфидных рудных тел из горных выработок комплексом электроразведочных методов (теневой и метод измерения естественного электрического поля) и показана возможность использования их при наличии мешающего влияния подземного шахтного энергосилового хозяйства. Поисковые работы подтвердили успешность предложенной методики, хорошие эксплуатационные качества используемой аппаратуры, точность и полноту интерпретации материалов теневого метода. Кроме того, в настоящей работе рассмотрена возможность применения методов постоянного тока для целей поисков и разведки рудных тел из горных выработок.