Application of methods of electrical exploration with controlled sources for detecting causes of sub?pass?location processes development

Aleksandr E. Shalaginov, Nina N. Nevedrova, Ilya O. Shaparenko, Sergey M. Babushkin

Research output: Contribution to journalArticlepeer-review

Abstract

The relevance of the work is caused by insufficiency of knowledge on the reasons of development of suffusion processes expressed as land surface failures menacing to infrastructure of industrial production in Caspian Depression. The aim of the research is to determine the near&surface and deep geoelectric structure of the site of manifestations of suffusion&sub& sidence formations to identify possible causes of their occurrence. Object of the research are suffusion&subsidence formations in the form of funnel&shaped earth surface dips with a depth of 1 to 6 m in an amount of 15 pieces located in three practically parallel zones. Methods. The entire volume of field data is obtained by three different depth methods of geoelectrics: electrotomography, vertical elec& tric sounding, non&stationary electromagnetic sounding. Processing, interpretation, visualization of data were carried out using interac& tive simulation and inversion software packages ERA, EMS, Zond, Res2D, ERTLab. The justification of the results is based on the analy& sis and comparison of the obtained geoelectric data with a priori geological data. Results. Based on the results of the work done, with depths of up to 400–500 m, sections and maps of electrical resistivity distribution at different depths, three&dimensional geoelectric models for both the near&surface and the deep part of the section were constructed. As a result of geological interpretation of the data, the zones were identified (according to the resistivity parameter) to which the existing funnels were confined, the direction of removal of the destroyed (washed out) rocks was determined. The authors identified the structures related to the zones of development of suffusion&subsidence processes, and stated possible reasons for their formation. Conclusions. The paper demonstrates high efficiency of the complex of electromagnetic methods used on the site with the destructive phenomena. It is concluded that the main mechanism for funnels formation is associated with leaching of limestone and salt «cement» from the N&Q sediments, with further unloading into deeper watered horizons. This complex can be recommended at the solution of si& milar tasks in other regions where there are zones of manifestation of suffusion processes, and also for monitoring their development.

Translated title of the contributionПрименение методов электроразведки с контролируемыми источниками для выявления причин развития суффозионно-просадочных процессов
Original languageEnglish
Pages (from-to)26-40
Number of pages15
JournalИзвестия Томского политехнического университета. Инжиниринг георесурсов
Volume330
Issue number4
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Geoelectric structure
  • vertical electric sounding
  • electrotomography
  • non-stationary electromagnetic sounding
  • suffosion processes
  • RESISTIVITY TOMOGRAPHY

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