Geophysical surveys

Geophysical survey of a land plot is used for:

• choosing a place to “plant” a house (cottage), auxiliary buildings and septic tank;
• choosing a location for a water intake point, indicating the water depth;
• assessment of the hydrological structure of the site;
• identification of construction risks on the site;
• zoning of the territory for other objects, sites, etc.

Issues of zoning a territory arise for everyone who begins to develop a site, and they are decided not only by personal choice: there are standards, rules, “red lines,” the opinions of family members and specialists of all professions: from gas workers and electricians to drillers and landscapers.

The choice of place for planting the foundations of buildings on loose soils directly affects their durability and integrity - and therefore the cost of operating the buildings, and the convenience of living in the house and on the site.

Geophysical survey of the land plot gives its owner an idea of ​​the places of influence of geodynamics and hydrodynamics on foundations and other objects as zones of construction risks.

Geodynamic forces manifest themselves in the form of subsidence, soil movements, flooding, manifestations of frost heaving forces - everything that “provides” damage to the foundations. More often this happens during the operation of buildings, less often during the construction stage.

Geophysical survey of the site for the construction of a cottage allows you to select in advance “quiet” low-dynamic and low-water areas for all objects planned on the territory: for a house, bathhouse or garage, for a septic tank, collector, etc.
A place with high hydrodynamics and/or a large area of ​​soil watering is selected for a well or borehole.

The results of geophysical survey are issued in the form of geophysical maps:

Thus, from the very beginning of developing your land, you can insure yourself against construction and operational problems and take the following exact actions:

• correctly “plant” the house and auxiliary buildings;
• place the septic tank in a place where it will be minimally susceptible to soil movements and the influence of groundwater;
• choose a water-abundant place for a well or well - with an understanding of the depths of water, the ability to preliminarily assess the quality of water at neighboring water intake points;
• assess the behavior of groundwater and adjust the drainage scheme of the site and/or buildings;
• carry out general zoning of the site for other objects, sites, etc. - even trees can be planted correctly, ensuring their health and long life.

Each section has its own personality and does not exactly repeat the neighboring section:

Promterra company professionally engaged in engineering geophysical surveys in Moscow, Kazan, Nizhny Novgorod, as well as in other cities and regions of Russia.

Carrying out geological surveys is often not enough to study complex areas of terrain for the construction of facilities or highways, and drilling operations are not always possible due to the inaccessibility of the territory, terrain features or the presence of buildings and industrial structures. In this situation, geophysical surveys (research) are almost the only possible option.

Geophysical work differs from other types of engineering surveys for construction and, in particular, well drilling or geological research in the consistency of obtaining information on the area under study.

Geophysical work

Geophysics combines several areas of knowledge - ecology, geology, chemistry, physics, mathematics and others.

Geophysical work- these are engineering surveys aimed at studying the upper layers of the earth's crust, in the case of supplementing or replacing geological, hydrogeological work and drilling wells.

Research is carried out when other methods of obtaining information are difficult or impossible due to the complexity of the terrain or other natural and artificial limitations.

Engineering and geophysical surveys at construction sites include:

• lithological division of the section;
• study of groundwater levels;
• study of geophysical changes in permafrost phenomena;
• identification of geological processes (landslides, karst sinkholes, zones eroded by groundwater);
• study of bedrock depth;
• identification of areas with the presence of specific types of soil (peat, silt);
• geophysical studies of the development of cryopegs and taliks;
• analysis of the lithology of water transitions.

The study of artificial pavements of highways, railway facilities, airfields and their natural foundation involves the analysis of components and internal layers, as well as the identification of dangerous areas with the presence of karst sinkholes, soil subsidence, and flooding of construction sites.

Geophysical work also involves searching for underground communication networks and archaeological sites using a special ground penetrating radar. The environmental tasks of geophysics include the study of areas of distribution of petrochemical and other types of man-made environmental pollution.

Geophysical methods for well exploration

This is a comprehensive study of the soil and rock obtained by drilling wells using special geophysical equipment, as well as checking the technical condition of the wells themselves.

There are two groups of research methods:

• logging methods;
• borehole geophysics methods.

Methods are classified as electrical (natural polarization method, electrical logging, etc.), nuclear (neutron, gamma-ray method), thermal, magnetic and seismoacoustic.

Logging

Logging examines relatively small volumes of soil and rock from the borehole walls.

Logging (drilling geophysics) is one of the main methods of geophysical research of the geological structures of a well using a special probe.

This method is distinguished by high accuracy and structured research, since the data obtained is recorded in the form of a permanent diagram or in digital (mathematical values) form.

Borehole geophysics

Borehole geophysics methods make it possible to study the inter-well and near-well space by studying geophysical fields. Borehole geophysics differs from logging methods in a wider area of ​​research.

Borehole geophysics is research to study the rocks being extracted from the walls and between wells at any given distance.

Borehole geophysical methods are most widely used in mining operations. Electrical, radio wave, geochemical and magnetic methods are used to study the material.

Geophysical surveys from the Promterra Company

The company's specialists carry out work on the study of wells, artificial pavements of highways and large artificial sites, as well as embankments and structures with a natural foundation. The quality of the research carried out has been repeatedly noted by letters (can be viewed on the website pages - in the Reviews section) from our clients and customers.

A separate type of research is engineering geophysical surveys. They represent a complex set of engineering works that must solve non-standard problems in the field of engineering and geological surveys. Often such studies are carried out in conjunction with other surveys, for example, hydrogeological, archaeological or geological. The main difference between geophysical surveys and geological surveys is the set of study methods. In geological surveys, various types of drilling and soil sampling are used. Geophysical surveys use instruments that measure soil parameters using, for example, radar.

Engineering geophysical surveys are required if specific tasks arise. They are also necessary in the presence of non-traditional work conditions. The geological conditions themselves are very variable in structure, so their detailed study will lead to high costs. Sometimes it becomes completely impossible, so there is a need to conduct geophysical research.

Goals and objectives of engineering geophysical surveys

A characteristic feature of practical geophysics is a relatively young age. But despite this, it can be used to solve quite complex problems. The correct choice of geophysical survey methods and the correct formulation of questions will allow you to quickly achieve your goal.

For all geophysical surveys, the most important are two goals: maximizing the information content of the main complex of survey work and significantly reducing their cost.

Currently, with the help of geophysical research it is possible to solve many problems:

• study of the hydrogeological features of the territory;
• study of the conditions of occurrence of aquifers;
• studying the geological conditions of the site to identify voids in the rocks, as well as compiling their geophysical characteristics;
• studying the processes of the geological environment, for example, karsts, landslides and others;
• study of soil moisture levels and water properties;
• determining the thickness of bulk soils in areas where highways are located;
• identification of a network of underground communications;
• monitoring the soil in areas of active development and during the operation of buildings;
• studying structures made of concrete and reinforced concrete to identify deformations and weak areas;
• search for a cultural layer in archaeological research.

As a result, we can conclude that by carrying out comprehensive geophysical research, it is possible to abandon geological and hydrogeological surveys, which require large expenses.

Engineering geophysical surveys in the form of a set of works are a complex type of research that requires production facilities and additional resources.

These works are necessary when inspecting and monitoring various large objects. These could be residential buildings, industrial enterprises, highways or railways. This type of research is also necessary for monitoring hydraulic structures and conducting archaeological research.

Geophysical surveys include the following work:

• electrical reconnaissance;
• ground penetrating radar;
• seismic exploration;
• geophysical survey of wells.

The TechnoTerra company has the necessary production potential for high-quality implementation of any geophysical work. In addition, we have a staff of qualified specialists. They can very quickly process information obtained in the field.

Features of organizing geophysical surveys

To carry out a set of geophysical surveys, an agreement is drawn up with the customer, who must have the following documents on hand:

1. Terms of reference for the survey, which describes the composition and scope of the required work.
2. Plans of the study area: aerographic and topographical. They should indicate the points of the research being carried out. But the company’s specialists can themselves develop plans for exploring the territory if there is no specific instruction.
3. An agreement with the customer, which contains such mandatory clauses as the timing of geophysical surveys and their cost.

After the work has been completed, the customer will have a complete package of documents, which contains accurate information on the survey of the study area. This report will be supplemented with plans and sections of the territory. They will indicate the specified research parameters. At the same time, geophysical surveys can be carried out not only separately, but also in conjunction with archaeological or geotechnical work.

Contacts

1,400 rubles per meter. More details
Why should you order from us?

Engineering geophysical surveys represent a group of methods that are based on a detailed study of natural and artificial physical fields, as well as the physical properties of soil masses. These works are carried out in pre-dug wells in the study area (massif). The result of this research is a detailed study of the geology of the site.

Our organization has been conducting geophysical engineering research for many years, and for this we have all the necessary equipment and specialized knowledge in this field.

Study details

For each specific situation, we select an individually defined set of geophysical studies. It mainly depends ondesign stage of one or another object of study, from the available material of geological knowledge of the area, as well as from the object of study itself (its purpose).

Surveys are carried out only in accordance with government regulations, as well as on the basis licenses and state certificates for the right to perform these works on the territory of Russia.

As a result of these studies, we obtain accurate indicators on the composition and thickness of loose sediments (of various types), and also identify the lithological structure of the presented rock mass (this also includes high-risk zones in which the formation of cracks, flooding and tectonic disturbances are possible).

Conducting geological surveys using geophysical research, we determine the exact depth of soil and groundwater, as well as the direction of movement of these water flows and the hydraulic parameters of aquifers and soils. An important nuance of these studies is the identification of possible dangerous geological processes on the site that can lead to the destruction or displacement of buildings or structures erected on it.

What problems are solved using geophysical research?

Engineering geophysical surveys solve a number of engineering and geological problems:

1. determine the composition and some mechanical properties of soils;
2. identify the presence of specific soils on the site (for example, peat, silt, etc.);
3. identify the presence of hazardous geological processes at the site;
4. find and map underground objects (cavities located in the ground);
5. determine the level, speed and direction of groundwater filtration flow;
6. map the roof of the rock foundation in detail, etc.

Our organization professionally carries out this type of research due to the presence of its own certified geotechnical laboratory, which is equipped with advanced analytical equipment. We use only specialized equipment , which has been tested by Gosstandart and complies with all relevant regulatory documents. The latest techniques and experience allow us to carry out the most complex geological studies.

Part I. General rules for work Appendix D(recommended) Z objectives of basic and auxiliary methods of geophysical research during engineering geological surveys Research objectives Geophysical methods Basic Auxiliary Determination of the geological structure of the massif Topography of rocky and frozen soils, thickness of non-rocky and thawed overlying soils Electrical prospecting using electrical profiling (EP) and vertical electrical sounding using the apparent resistivity method (AVE); seismic exploration using the refracted wave method (REM) and reflected wave method (CRW) VES using the two-component method (VEZ MDS); frequency electromagnetic sounding (FEMS); dipole electromagnetic profiling (DEMP); reflected wave method (MOB); gravity survey Dissection of the section. Establishing boundaries between layers of different lithological composition and condition in rock and dispersed rocks VES; MPV; various types of logging - acoustic, electrical, radioisotope VES MDS; VES using the method of evoked potentials (VES EP); CHEMZ; vertical seismic profiling (VSP); continuous seismoacoustic profiling in water areas Location, depth and shape of local heterogeneities: zones of fracturing and tectonic disturbances, assessment of their modern activity VES; VES MDS; circular vertical sounding (VES), natural field method (NS); MPV; COGT; VSP; flow metering; various types of logging; radiokip; gas emanation survey; ground penetrating radar VES VP; radio wave transmission; DEMP; magnetic prospecting, registration of the natural pulsed electromagnetic field of the Earth (NPEMF); karst cavities and underground workings EP; VES; VES; VSP; flow metering, resistivity metering, gas emanation survey COGT; seismoacoustic scanning; radio wave transmission; gravity survey; ground penetrating radar buried remains and local recesses in the bedrock COGT; VES; VES MDS; EP; gravity survey, magnetic survey; gas emanation survey DEMP; seismic scanning; ground penetrating radar ice and heavily icy soils EP; VES; VES MDS; MPV; various types of logging VES VP; DEMP; CHEMZ; micromagnetic survey, gravity survey interpermafrost waters and taliks EP;VEZ MDS; thermometry PS; VES VP Study of hydrogeological conditions Depth of groundwater level Depth of occurrence, thickness of lenses of salt and fresh waters EP; EP MDS; VES; resistivity measurement VES MDS; VES VP; CHEMZ; flow metering Dynamics of groundwater level and temperature Stationary observations of VES; MPV; neutron-neutron logging (NN); thermometry Direction, speed of movement, places of groundwater discharge, changes in its composition Resistivity measurements; flow metering; charged body method (BMT); PS; VES Thermometry; spectrometry Groundwater pollution VES; resistivity measurement Study of the composition, condition and properties of soils Rocky: porosity and fracturing, static modulus of elasticity, modulus of deformation, temporary resistance to uniaxial compression, resistance coefficient, stress state Various types of logging, MPV; seismoacoustic scanning; VSP; laboratory measurements of electrical resistivity (ER) and elastic wave velocities Sandy, clayey and silty, coarse-clastic: humidity, density, porosity, deformation modulus, angle of internal friction and adhesion Various types of logging, VSP SPV, seismic transmission; laboratory measurements of resistivity and elastic wave velocities Sandy and clayey permafrost: humidity, ice content, porosity, density, temporary resistance to uniaxial compression Various types of logging; VSP; laboratory measurements of resistivity and elastic wave velocities VES; VES MDS Corrosive activity of soils and the presence of stray currents VES; EP; PS: laboratory measurements of polarizing current density; registration of stray currents Study of geological processes and their changes Changes in the stress state and compaction of soils MPV; VSP; seismic scanning; various logging pitchforks; resistivity testing in wells and reservoirs: gravimetry Registration of the Earth's natural pulsed electromagnetic field (PEMF); PS; emanation photography MPV, EP; VES; various types of logging PS; regime observations of acoustic emission; magnetic stamps; emanation photography; ENPEMF VES MDS; EP; PS; MPV; UCP; various types of logging; resistivity testing in wells and reservoirs; gravimetry VES; VES VP; MMT, emanation photography Changes in the thickness of the thawing layer, temperature and properties of frozen soils VES; EP; MPV; VSP; various types of logging Seismic microzoning of the territory MPV; VSP; gamma-ray logging (GG); registration of weak earthquakes, explosions Registration of strong earthquakes, registration of microseisms, determination of characteristics of attenuation and absorption of seismic waves in soils Note -In difficult engineering and geological conditions, VES is carried out in a modification of VES MDS. Legend: - EP - electrical profiling; VES - vertical electrical sounding; VES MDS - vertical electrical sounding using the two-component method; CHEMZ - frequency electromagnetic sounding; EP MDS - electrical profiling using the two-component method; DEMP - dipole electromagnetic profiling; VES VP - vertical electrical sensing of evoked potentials; KVEZ - circular vertical electrical sensing; PS - natural electric field; EES - electrical resistivity; MBT - charged body method; ENPEMF - natural pulsed electromagnetic field of the Earth; SPV - seismic exploration using the refracted wave method; MOB - seismic exploration using the method of reflected waves; CDP - seismic exploration using the common depth point method; VSP - vertical seismic profiling; OGP - seismic prospecting using the general deep platform method; NNK - neutron-neutron logging; GTC - gamma-gamma logging

Engineering-geological surveys today they occupy an important place in the design of buildings and structures (power lines, gas and pipelines, etc.). This set of works also includes geophysical survey methods, which are an integral part of geological exploration work.

Geophysical survey methods We also use it in cases where geological research cannot provide detailed information on the geology of the site (geological research includes drilling with pits, and also, in some cases, with ditches).

Varieties of geophysical methods

Geophysical methods for studying wells make it possible to quickly obtain reliable geological information about a given area (area). In addition, there is an opportunity to reduce labor costs and save your money, because... Drilling costs are much higher. Our organization has modern engineering equipment that allows us to carry out the following geophysical survey methods:

• electrical;
• thermal;
• seismoacoustic;
• magnetic.

Each of these methods allows you to perform a specific type of research. We provide the following geophysical methods for well exploration:

• seismic profiling according to the wave refraction method (shock excitation of seismic waves);
• electrical vertical sensing;
• method of natural potentials;
• electromagnetic research methods;
• electrical profiling;
• detailed logging.

Areas of use

Engineering surveys are significantly simplified and become more detailed through the use of geophysical survey methods. The scope of application of these research methods is quite extensive: research of soil under foundation the building being designed, searching for the reasons for the deformation of the already erected foundation and the appearance of cracks in the building, searching for sources of water supply (for villages and cities), carrying out geological exploration work.

Geophysical methods for studying wells have quite a lot of advantages, the main one of which is their manufacturability. Carrying out these works, it becomes possible to combine various methods of geophysical research depending on the geological task at hand, as well as the customer’s requirements. It is necessary to understand that the geology of the site requires timely soil research and identification of geological features for subsequent development. If you have carried out geophysical research before starting construction, you can rest assured about the reliability and durability of the future building. We offer geophysical surveys at affordable prices, which can significantly reduce all costs of preparatory work before construction. Place an order for geological surveys

Engineering-geophysical research is both auxiliary work in the complex of engineering-geological, hydrogeological, geocryological, archaeological and other surveys, and an independent type of work that solves individual, usually non-standard problems. The use of geophysical surveys is associated with the specifics of the problems being solved, the conditions of the work, and often their use is due to the goal of reducing the cost of the survey complex. The latter is determined by the fact that the geological environment is very variable, and detailed study is either impossible due to complex conditions or very expensive. Geophysical engineering surveys come to the rescue; their use can significantly reduce the cost of work.

Modern development of geophysics makes it possible to solve quite complex problems. Over the more than half a century of existence of this relatively young science, it has armed itself with great knowledge that allows it to solve these problems effectively and with great accuracy. The effectiveness of studying the geological environment by engineering geophysical research is largely determined by the competent formulation of the problem and the correct choice of a set of geophysical methods.

The MiIGeology company is ready to perform various geophysical tasks and has all the necessary production resources to carry out engineering geophysical surveys using all geophysical methods:

• seismic survey
• electrical prospecting
• magnetic prospecting
• gravity survey
• well geophysical survey

Engineering geophysical research using the methods listed above solves the following problems:

• study of the geological section (identification of the boundaries of rock layers, identification of voids in rocks, study of the physical physical and mechanical properties of rocks)
• study of hydrogeological conditions (groundwater conditions, their physical and chemical properties)
• study of geological and engineering-geological processes and phenomena (karst, suffusion, landslides, permafrost, etc.)
• stationary observations of the soil mass located in the active zone of structures during their construction and operation
• search for underground communications, collectors, underground structures
• study of reinforced concrete structures (search for deformations, identification of weakened zones, search for reinforcing mesh, etc.)
• search for a cultural layer to substantiate archaeological work

The MiIGeology company has completed a large number of geophysical tasks, most of which are engineering geophysical studies to study the upper part of the section - the environment studied during engineering surveys in construction. However, among those completed, the MiIGeology company has tasks for the search and exploration of mineral resources in the Magadan region, Yakutia.

Employees of our organization are always ready to answer questions and help in setting a problem for engineering geophysical research and choosing its solution using a method or a set of methods over the phone. At odd hours, you can always ask a question in the feedback form and our employees will definitely contact you.