The first experimental measurements of the cross-correlation function (CCF) of the Earth’s seismic and electrical noise were carried out in two areas of the Minusinskoe gas condensate field in 2014 and 2015 using a VPEMPZ-M1 (Shum-6) two-channel geophysical device developed at Siberian Federal University. The Earth’s seismic noise and electrical noise in the frequency range 0.1–20 Hz were received by a geophone and an electric dipole, respectively. In both cases, a productive pool at depths of 1800–2000 m had a maximum CCF value five to seven times higher than the normal background, indicating the occurrence of the seismoelectric effect in passive fields.

The main aim of this work is physical interpretation and experimental verification of the method based on a recording of seismoelectric effect in natural Earth's seismic and electromagnetic fields. In this case, a deposit is described by a model of the flat condenser in which ion-conducting medium (deposit waters) serve as plates and deposited hydrocarbons serve as a dielectric layer. The considered frequencies of both types of fields are in the range of 0.1-20 Hz. The calculated curve of electric field distribution on Earth's surface generated by deposit seam induced by natural electric and seismic fields of the Earth's crust is given. Experimental data of observations of seismoelectric effect in passive fields are presented obtained in 2014-2017 at Bystryansky gas condensate field (Krasnoyarsk Krai, Minusinsk district) by the recording of passive electric and seismic fields as well as measurement of their cross-correlation.

The paper deals with the physical fundamentals of the phase geoelectric method of induced polarization (IP) based on the extraction of information from the natural electromagnetic field of the Earth (NEMFE) in the frequency range 0.1–20.0 Hz. Scientific and technical justification is provided for the differential measurement circuit parameters of the NEMFE and the algorithm of processing of the received signals with the calculation of the IP coefficient, assuming the identity of the field characteristics in two receiving lines. The method consists in recording random noise signals from two adjacent receiving electrical dipoles with simultaneous memorizing of the amplitudes and their automatic equalization. Then the difference between the signals is calculated, with subsequent energy normalization. The presented theoretical fundamentals for the calculation of the IP coefficient of the NEMFE and the processing algorithm were tested in laboratory experiments. Under the assumption of the complete identity of the medium beneath the receiving dipoles, the IP coefficient was 0.01–0.03, due to the error in the elemental base of the analog input path. The paper also presents the results of field experiments on the Samson iron deposit in the Republic of Khakassia. The experimental work confirmed the effect of IP on the NEMFE in the anomalous area and showed that the results are consistent with theoretical and laboratory predictions and the data obtained using a KEP-M pulse system. It is concluded that this method can be used to detect productive anomalies and has an advantage of eliminating artificial sources of excitation of geologic sections.

The article discusses urgent problems for the northern regions of monitoring the integrity of piles and parameters of the surrounding soil by seismoacoustic and electromagnetic methods and the tasks of remote monitoring for a long time. The possibility of controlling the piles by measuring the intrinsic resonant frequency of the borehole by the acoustic method and the parameters of the surrounding soil using temperature and humidity sensors with an estimate of the tangent of the angle of loss of electromagnetic fields at frequencies of 0.02–1 MHz is estimated.

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