Electrical Surveying
A method of exploration geophysics that uses electromagnetic fields to study the Earth's structure in order to search for minerals and solve other applied problems.
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Electrical Surveying Methods:
- Induced Polarization Method (IP, VIP);
- Magnetotelluric Sounding (MT, AMT, AMTS);
- Frequency Domain Electromagnetic Ranging (FDEM);
- Charge Electromagnetic Ranging;
- Transient Electromagnetic Ranging (MPP, TEM, TDEM);
- Borehole Electrical Prospecting (Time Domain Pulse-EM system).
Electrical Surveying Tasks:
- Prospecting for and exploring ore deposits;
- conducting geological mapping;
- studying and prospecting for groundwater (hydrogeological tasks);
- prospecting for and prospecting for building materials and other non-metallic minerals;
- identifying local oil and gas-prospecting structures, assessing the reservoir properties of individual layers of the sedimentary cover;
- studying sedimentary basins at the regional level;
- studying conductive zones in the Earth's crust and upper mantle (deep geoelectrics);
- studying the structure of soils and their properties in the construction of engineering structures (engineering-geological tasks);
- studying soil and groundwater contamination (geoecological tasks);
- searching for and studying archaeological sites;
- searching for and studying the condition of man-made structures (pipelines, foundations, cables, etc.).
Advantages:
- High sensitivity to conductivity contrasts;
- Possibility of exploration at great depths;
- Relative simplicity and high speed of fieldwork;
- Low cost compared to drilling;
- Eco-friendly;
- Ability to work in hard-to-reach areas;
- Variety of methods for different tasks;
- Well suited for engineering and environmental surveys.
Project examples
How We Do It.
Proven Methods and Modern Solutions
Proven Methods and Modern Solutions
Work on copper and associated components in the Karaganda region.
The following surveys were conducted at the Ordabasy site in the Karaganda region: a 160-linear VP-SG electrical survey along a 100 x 20 m grid; and a 300-point MPP electrical survey using coaxial 200 x 50 m loops with a 200 m pitch along the profile.
The following tasks were addressed: detailed structural mapping to clarify the structural and tectonic elements of the geological structure, identify zones of hydrothermal-metasomatic rock alteration, and localize massive sulfide bodies at depth.
The work resulted in: analysis of existing geophysical data, generation of digital models of the magnetic field and geoelectric parameters, calculation of the most informative transforms of geophysical fields, their analysis, volumetric modeling, and development of an interpretation framework.
The following tasks were addressed: detailed structural mapping to clarify the structural and tectonic elements of the geological structure, identify zones of hydrothermal-metasomatic rock alteration, and localize massive sulfide bodies at depth.
The work resulted in: analysis of existing geophysical data, generation of digital models of the magnetic field and geoelectric parameters, calculation of the most informative transforms of geophysical fields, their analysis, volumetric modeling, and development of an interpretation framework.
Work on the Baital site, located in the Koksu and Kerbulak districts
Between May and July 2024, electrical exploration was conducted at the Baital site (an area of 61.39 km²) using resistivity and induced polarization (IDP) in the time domain, using modifications of median gradient electrical profiling (MGD) over a 12.3 km² area and dipole electrical sounding/deep electrical tomography (DERT) over a 17.6 linear km area. IGD was performed in an areal configuration over a 200 m x 50 m grid. Detailed digital electric field models were created for the Baital site; pseudoelectric sections, resistivity and polarizability horizon maps were constructed, and a three-dimensional geoelectric model was obtained. As a result of this work, existing structural-tectonic and geological diagrams of the Baital site were refined, and additional criteria for predicting ore-promising targets were developed to optimize the subsequent exploration program.
Based on the interpretation of the obtained data, recommendations were provided for further exploration of the area.
Based on the interpretation of the obtained data, recommendations were provided for further exploration of the area.
Well electrical exploration at the Maleevsky site
Exploration and appraisal work was conducted on a surface 8.63 km² MPP and a borehole 1.56 km² MPP. Geophysical well logging was performed using the transient process method, with secondary electromagnetic field measurements recorded in point mode along the borehole at 10-meter intervals, also with detailed recording at 5-meter intervals. The goal of the MPP electrical exploration work was to create a 3D geophysical model based on the obtained digital electrometric data for the study of potentially promising areas.
HOW WE WORK
Preparatory stage
Field work
Office processing
Interpretation of results
Reporting
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