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Multicomponent Sounding by Establishing the Field of Polarizing Seam upon Its Excitation by Horizontal Electric Dipole

To expand the scope of unsteady electromagnetic fields in marine and land prospecting and mapping studies of deep-seated and/or polarized geological objects, such as oil and gas deposits, kimberlite bodies and other minerals, it is advisable to consider an engineering-analytical multicomponent model of an electrically conductive layer when excited by horizontal electric dipole – the classic causative agent of the formation of the field of horizontally layered media. To simplify analytical studies, the Cole-Cole dispersion model adopted for the polarized known plane Sη was adopted as polarizable electrically conductive layer. The components of analytical expressions are described that describe the establishment of the electromagnetic field of an induction-induced polarizing conductive layer — objects of hydrocarbon deposits and sulphide ore occurrences. To identify the deep horizontal inhomogeneities of the section, equations are given that describe multicomponent fluxes of magnetic induction of polarized formation.


Introduction
One of the main tasks of multicomponent studies is the observation of the horizontal component of magnetic induction, which together with the vertical component expands the amount of information obtained about deep geoelectric heterogeneities, for example, such as zones of oil-water contacts, oil and gas deposits, boundaries of kimberlite bodies, tectonic disturbances, sulfide ore occurrences and etc. [15,21,25].
Currently, many researchers have experimentally established the occurrence of double induced polarization during the electromagnetic excitation of oil and gas deposits, sulfide ores and some other objects. In this case, the occurrence of induced polarization can serve as an indicator of oil and gas deposits, sulfide ore occurrences. In this regard, the development of engineering and analytical models for the establishment of electromagnetic components of magnetic induction of induction-polarizable conductive layer seems relevant, has practical and scientific significance.

Presentation of a problem
In accordance with the physical and mathematical formulation of the electrodynamic problem, we present the object of research in the form of an induction-polarized conductive layer approximated by the planepolarizing longitudinal conductivity adapted to the conductive layer by the most common and widely tested Cole-Cole model [2,12,17].
To simplify the analytical analysis, we limit the relaxation time to τ≥10 -5 s, which is experimentally tested for geological objects and implemented in practice [11,12].
Horizontal electric dipole with moment P e will be placed at height h=-z from the plane at the origin of the cylindrical coordinate system (r, φ, z), combined with the Cartesian coordinate system (x, y, z) and directed along the x axis.
The medium containing the plane is described by the Laplace equation: 2 = 0 Degenerate boundary conditions are used on the plane [19].

Analytical analysis
Components of the magnetic induction of field formation are determined in the form of relations:  components of magnetic induction along the x, y, z coordinate axis respectively; ,potential vectors along the x and z axis respectively. Figure 1 (a, b) shows the ( ), ( ) electro-sounding curves as an example, which show the change of sign of these components in the presence of induction-induced polarization, which can serve as an indicator of mineral resources and ice masses [7,11,23,24].

Conclusion
Pulse analytical models of the components of magnetic induction of horizontal electric dipole of induction-polarizing conductive layer are considered, into which the most common generalized Cole-Cole formula, which describes the induction-induced polarization, which is adapted to the conductive layer, is introduced, which is one of the signs of an oil and gas deposit, sulphide ore manifestation and other inhomogeneities.
An analysis of the components of an unsteady electromagnetic field, its integral characteristics of electrically conductive induction-induced polarizing media significantly expands the possibilities of pulsed electrical exploration in prospecting-mapping and structural-tectonic studies. Negative values of the components of the sounding curves of field formation can be one of the signs of existence of an oil and gas deposit, sulphide ores and other polarizing objects.
Engineering and analytical models describing the pulsed components of magnetic induction are presented in elementary functions, in which the relationships of all parameters of the processes of induction-induced polarization are viewed.