Engineering Survey Vol. XV, No. 5-6/2021
Alexandrov P.N., Rybin A.K.
Alexandrov P.N., Rybin A.K., 2021. About a “wide” profile in the electrical resistivity tomography method. Engineering Survey, Vol. XV, No. 5-6, pp. 50–56, https://doi.org/10.25296/1997-8650-2021-15-5-6-50-56.
The paper proposes a new measuring “strategy” in the electrical resistivity tomography method and evaluates its effectiveness using a model experiment (synthetic data). The method is based on the use of the sourcewise approximation of the observed data. The main advantage of the electrical resistivity tomography method is a large number of electrodes, which allows to make a significant number of measurements of the potential difference from a wide range of sources at different distances. This method has a huge potential for its development, which allows us to offer, along with standard processing systems, new measurement schemes and ways of processing and interpreting field data, especially when studying anisotropic geological media. The proposed observation system and the algorithm for processing electrical resistivity tomography data are based on the concept of a “wide” profile, similar to that used in seismic exploring. Currently, the main method of placing electrodes is “linear” profile, when the electrodes are located along a straight line. The disadvantage of such measuring system is lack of accounting for the influence of lateral geoelectric inhomogeneities, which can introduce strong distortions in the results of processing and interpretation of the observed electrical resistivity tomography data. The authors proposed an electrode arrangement of the so-called “wide” profile, when the electrodes are arranged in zigzag form. Based on the conducted model experiment and analysis of the obtained synthetic data, it is shown that using “wide” profile measuring scheme makes it possible to determine the location of lateral inhomogeneities during electrical resistivity tomography observations in practice i.e., obtain additional information about the geoelectric structure of an inhomogeneous anisotropic medium. Thus, the using a “wide” profile measuring scheme in the method of electrical resistivity tomography increases the reliability of the quantitative interpretation of field observation data.
1. Aleksandrov P.N., Aleksandrov A.N., 2009. Sourcewise approximation in problems of seismic prospecting and geoelectrics. Galperin Readings, Abstracts of the IX annual International Conference and Exhibition, Moscow, 2009, рр. 58–61. (in Russian)
2. Aleksandrov P.N., Modin I.N., 2021. Theory of solving inverse problems of geophysics without solving direct ones. Sourcewise approximation: the idea of the algorithm. Electric prospecting 2021, Collection of abstracts of scientific and practical Conference, Moscow, 2021, pp. 6–13. (in Russian)
3. Aleksandrov P.N., Monakhov S.Yu., 2014. Sourcewise approximation in three-dimensional inverse problems of electric prospecting. Volga and Pricaspian Region Resources, Issue 80, pp. 35–45. (in Russian)
4. Balk P.I., Dolgal A.S., Pugin A.V., Michurin A.V., Simanov A.A., Sharkhimullin A.F., 2016. Effective algorithms for sourcewise approximation of geopotential fields. Fizika Zemli, No. 6, pp. 112–128, https://doi.org/10.7868/S0002333716050021. (in Russian)
5. Zabinyakova О.B., Aleksandrov P.N., 2020. Magnetotelluric data analysis using sourcewise approximation method. Geoinformatika,
No. 2, pp. 49–64. (in Russian)
6. Zaborovsky A.I., Khmelevskoy V.K., Kovalenko V.F., Nazarenko O.V., Popov V.A., Vedrintsev G.A., Kalenov E.N., Matveev B.K.,
Blokh I.M., Svetov B.S., 1980. Electric prospecting: a reference book of geophysics, in A.G. Tarkhov (ed.). Nedra, Moscow. (in Russian)
7. Modin I.N., Makarov D.V., Aleksandrov P.N., 2014. Potential of resistivity stations for electrical monitoring. Engineering Survey,
No. 9–10, pp. 22–31. (in Russian)
8. Pugin А.V., 2018. Sourcewise approximation of geopotential fields. From theory to practice. Geophysical Research, Vol. 19, No. 4,
pp. 16–30, https://doi.org/10.21455/gr2018.4-2. (in Russian)
9. Khmelevskoy V.K., Shevnin V.A., 1994. Electric prospecting by the resistivity method. Publishing house of the Moscow State University, Moscow. (in Russian)
10. The official site of the x2ipi software, 2021. Protocols for Syscal-Pro. x2ipi — toolbox for electrical resistivity tomography.
URL: http://x2ipi.ru/vesti/protokoly-dlia-syscal-pro (accessed: 1 September 2021). (in Russian)
PAVEL N. ALEXANDROV*
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences; Moscow, Russia; alexandr@igemi.troitsk.ru
Address: Bld. 10, Pde 1, Bolshaya Gruzinskaya St., 123242, Moscow, Russia
ANATOLII K. RYBIN
Research Station of the Russian Academy of Sciences in Bishkek; Bishkek, Kyrgyzstan; rybin99@yandex.ru
Address: Research Station of the RAS, 720049, Bishkek, Kyrgyzstan