On Experimental Observations of Seismoelectric Effect at Gas Condensate Deposit in Earth's Electromagnetic and Seismic Noises

Abstract

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.

Study of the Seismoelectric Effect of the Second Kind Using Molecular Sensors

“…As shown in Table 2 , obtained in 2019–2020, the experimental data confirmed the results of the measurements in 2014–2018 [ 27 , 28 , 44 , 45 , 46 , 47 ]. Figure 9 b also shows a curve obtained by solving Equations (1)–(8), according to which the values of the electric field strength E will correspond to the magnitude of the observed SE effect on the day surface.…”

“…Earlier [ 27 , 28 , 46 , 47 ], we have shown, both theoretically and empirically, that the SE effect of the second kind is most pronounced at the edges of the field. This is due to the distribution function of the electric charges along the boundaries of the field, which cause an EM field when exposed to microseismic disturbances.…”

“…This was the first attempt to process data obtained in different years of observation. Based on the experience of [ 27 , 28 , 44 , 45 , 46 , 47 ] on this profile, it can be concluded that the amplitude value of the observed cross-correlation coefficient on the Earth’s surface depends on many factors. Thus, the absolute value of this coefficient cannot be used for the assessment, and, therefore, the shape of the resulting curve is a more important factor.…”

“…The authors of this article previously conducted relevant experiments and showed that using the SE effect could be used to detect hydrocarbon deposits on land, both in passive application and in semi-active performance [ 27 , 28 ], that is, without using an active source of the EM field. This approach can significantly reduce the weight and size indicators and, as a result, the cost of exploration work.…”

“…In contrast to previously published studies [ 27 , 28 ], this work presents the modeling data and the estimation of the amplitude of the signals of seismic and EM fields in the extended frequency range from 0.1 Hz along the lower boundary. For this purpose, the SE effect observation system was implemented, in contrast to earlier experiments, on molecular fluid seismic receivers with a higher sensitivity including in the range from 0.1 Hz to 100 Hz.…”