Equipment & Software for Geophysical Surveys: Design, Manufacture, Support, Supply

Publications

Applications Of The Controlled-Source Radiomagnetotelluric Method In Near-Surface Investigations
Applications Of The Controlled-Source Radiomagnetotelluric Method In Near-Surface Investigations
The application of the CSRMT method with an electric dipole as a controlled source for the mapping of sand and gravel deposit is demonstrated. The survey was fulfilled in the far-field zone of the controlled source and standard magnetoteluric software tools were used for the 2D inversion. Good correlation with borehole sections and VES data confirmed the reliability of the CSRMT results.
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Crosshole Seismic Testing (CST) for Studying the Section at the Construction Sites of Highly Sensitive Facilities
Crosshole Seismic Testing (CST) for Studying the Section at the Construction Sites of Highly Sensitive Facilities
The paper describes an operational experience of crosshole seismic testing (CST) applied on a real object. The features of field survey, data processing and analysis of results are demonstrated. On the site three methods of borehole seismic survey were actually used: vertical seismic profiling (VSP), reversed VSP (RVSP), and CST. VSP was implemented in order to build an initial model. RVSP was necessary to clarify the properties of the upper waterless part of the section. CST was the basis for determining the properties of the section.
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The use of quasiorthogonal sweeps for simultaneous sourcing in vibroseis survey
The use of quasiorthogonal sweeps for simultaneous sourcing in vibroseis survey
Simultaneous acquisition techniques allow obtaining greater volumes of data and sophisticate its recording geometry through the use of several sources. Depending on the method of seismic (vibrational or pulse), different methods of signals separation are used. In this study, we demonstrate some methods of constructing uncorrelated signals for vibroseis simultaneous acquisition, their application on the example of synthetic data and the removal of the cross-correlation noise on the synthetic seismogram with use of hyperbolic median filtering.
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Projections Analysis of surface waves (PASW) – Description of the method and case studies
Projections Analysis of surface waves (PASW) – Description of the method and case studies
This study is intended to describe the PASW method and the results of its application. This technique is based on both the analysis of the dispersion and frequency dependence of the Rayleigh wave ellipticity. Unlike for SASW / MASW (Spectral / Multichannel Analysis of Surface Waves), during carrying out the PASW method there is no need for a priori information on the pressure wave velocity (or, in other words, on the Poisson's ratio) of the underlying layers. Thus, this technology allows one to reconstruct the velocity profiles of two body waves.
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Crosshole Seismic Testing: An Example Of Effective Usage Of The Method For Engineering Applications
Crosshole Seismic Testing: An Example Of Effective Usage Of The Method For Engineering Applications
The paper is devoted to the crosshole seismic testing method realization, carried out at the site of proposed construction of nuclear power plant in Paks, Hungary. The main stages of its realization are described along with data processing algorithms and main results. Conclusions sum up the applicability limits of such a method in low-velocity sections.
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Complex of high-frequency well seismic methods for detailed study of rock mass
Complex of high-frequency well seismic methods for detailed study of rock mass
The paper considers the possibilities of modern seismic equipment for shallow depths investigations from the point of view of increasing the signal frequency and, consequently, the resolution of seismic methods. The capabilities of vertical seismic profiling (VSP) in single well, reversed VSP (RVSP), and crosshole seismic testing (CST) are demonstrated.

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Near surface exploration for horizontal welling using CSRMT method: Case study
Near surface exploration for horizontal welling using CSRMT method: Case study
Horizontal welling is a common method for the laying of the pipelines. This technology requires detailed exploration of first 20-30 m of subsurface for searching the optimal path for the welling tools and minimization of the damaging risks. Situations when the pipeline trace crosses the river are very common. In such a case, it becomes necessary to explore geological cross-section just under the river and in the surrounding area. Usually this task is being solved using the following methods: seismic, vertical electrical soundings, electrical resistivity tomography, ground penetration radar.
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Crosshole Seismic Testing on Pressure and Shear Waves - An Example of Effective Usage of the Method
Crosshole Seismic Testing on Pressure and Shear Waves - An Example of Effective Usage of the Method
The paper describes an example of the implementation of crosshole seismic testing for pressure and shear waves at the site of proposed construction of Nuclear Power Plant "Paks-2" (Hungary). Based on the comparision of summary seismograms it was concluded that method demonstrates the best results at distances between wells of 25 27 m.
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Integration of geophysics and archaeology: exploring a burial site of the 4th to 7th century near Nizhny Novgorod, Russia
Integration of geophysics and archaeology: exploring a burial site of the 4th to 7th century near Nizhny Novgorod, Russia
This paper is intended to compare the results obtained with use of different geophysical methods (geomagnetics, electrical resistivity tomography, ground-penetrating radar and seismics) on a archaeological site and discuss the prospects of such an integration between geophysics and archaeology. The relevant experience thus obtained should help to locate more efficiently the buried structures (graves) in the subsurface. This research was carried out within the framework of the Field Camp 2014 devoted to exploration of the 4th to 7th century burial site near Nizhny Novgorod, Russ...
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Electrical Resistivity of the Kotlin Clayey Formation: a Combined Interpretation of Physical Properties
Electrical Resistivity of the Kotlin Clayey Formation: a Combined Interpretation of Physical Properties
In this paper, we present an application of the resistivity model based on a modified Archie’s law (Glower et al., 2000), and accounting for a conductivity of clay material, to the Kotlin clayey formation (Vendian age, St. Petersburg, Russia). We compare theoretical prediction of the model with experimental data based on the well logging and laboratory measurements of the core porosity and granulometric composition. We found that the experimental data are in agreement with the model prediction for the case of salty formation water (about 35 g/l).
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