RESULTS OF THE PROFILE COMPLEX INTERPRETATION OF GEOPOTENTIAL FIELDS THROUGH EMPIRICAL MODE DECOMPOSITION (EMD) AIMED AT OIL-AND-GAS OCCURRENCE PROSPECTS ASSESSMENT

(Dolgal A.S. Kalinin D.F. Yanovskaya Y.A. )

This article discusses the examples of the applied method of empirical mode decomposition (EMD) aimed at studying the structure of inherently non-stationary potential geophysical fields. Interconnections of the field decompositions' different frequency components (intrinsic mode functions - IMF) and geological and structural oil-and-gas occurrence pre-requisitions in two distant from each other regions of Russia (Komi Republic and Kamchatka region) are traced. It is shown that the behaviour of the field different frequency components used at evaluating «regional» and «local» pre-requisitions of oil-and-gas occurrence is due to the specific features of basement and sedimentary mantle structural and tectonic framework. In particular, it was established that the linear correlation coefficient between the observed magnetic field and combinations of total EMD-components thereof, showing the effect of different depth objects, describes the level of the basement structures succession in the sedimentary mantle. The presented resulting comparison of potential fields profile decomposition through two adaptive algorithms of quantitative interpretation, i.e. EMD and energy filtration, independently shows correctness of the underlying theoretical and methodical approaches.......

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  • 2019  № 1, pp. 2-12

MAGNETOTELLURIC SOUNDINGS ON YALTA - NOVOSYOLOVKA PROFILE IN CRIMEA

(Yakovlev A.G. Pushkarev P.Yu. Rokityansky I.I. Desyatov D.O. )

The paper presents the results of magnetotelluric soundings along the profile Yalta - Novosyolovka, crossing the Ai-Petri mountain and the MSU training ground. We consider methods of observation and processing of magnetotelluric data, obtained in abundant industrial noise area. Results of two-dimensional data interpretation are described. The electric conductivity anomaly, associated with the Predgorny fault, was revealed.......

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  • 2019  № 1, pp. 13-20

IDENTIFICATION OF SP ANOMALIES' ORIGIN IS AN IMPORTANT STEP OF QUALITATIVE INTERPRETATION

(Shevnin V.A. )

Self potential (SP) anomalies of diffusion-adsorption (DA) origin frequently considered as filtration (F) anomalies that is the case of false discovery. In nature DA anomalies are widespread while filtration anomalies are more rear. To distinguish these anomalies we should consider correlation of SP potential and apparent resistivity values along the same profile. In case of DA anomalies there is linear correlation between SP potential and logarithm of apparent resistivity.......

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  • 2019  № 1, pp. 21-24

APPLICATION OF 3D INTERPRETATION TECHNOLOGIES TO SOLVING FOUNDATION MONITORING PROBLEMS AT HYDROPROJECTS IN PERMAFROST REGIONS

(Velikin S.A. )

For many permafrost foundation monitoring problems, spatial representation of the temporal changes in geophysical sections is important to monitor the development of natural and human-induced processes in the zones where engineering structures interact with permafrost which is highly sensitive to anthropogenic disturbances. This paper demonstrates the applicability of 3D data processing technologies to permafrost foundation monitoring at dams and other hydroprojects.......

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  • 2019  № 1, pp. 25-32

FIELD EXPERIENCE OF SURFACE-TO-BOREHOLE ELECTRICAL RESISTIVITY TOMOGRAPHY SURVEYS

(Bobachev A.A. Stoynova A.M. )

In the article we analyze field experience of surface-to-borehole electrical resistivity tomography (ERT) surveys. It describes observational technique, processing and interpretation. There is proposed to use a different step between the electrodes on the surface and in the borehole. The solution to the problem of plotting apparent resistivity section for surface-to-borehole ERT surveys is shown. Interpretation of results are confirmed by mathematical modeling. The article will be of interest first of all to those who are looking for new opportunities to solve engineering and geological problems, since the combination of borehole and surface measurements significantly increases efficiency of electrical prospecting by increasing vertical resolution.......

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  • 2019  № 1, pp. 33-40
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