Abstract. The article analyzes the surface
impedance of the medium over hydrocarbon deposits in the regime of radiopulse
signals. The components of the surface impedance of an anisotropic medium above
the deposit in the mode of radiopulse signals are derived on the basis of the
quasihydrodynamic approach using multiparticle electron-ion currents. The
amplitude and phase analysis of the components of the surface impedance of the
medium over hydrocarbons is undertaken. It is shown that the results of the
investigations can be used to identify the environment over deposits by the
nature and magnitude of the amplitudes and phases of the components of the surface
impedance of the anisotropic layer. The components of the surface impedance of
anisotropic media above hydrocarbon deposits in the mode of radio-pulse signals
can be determined in a wide range of probed signals frequencies, dielectric
permittivities and conductivities of the media.
The frequency response of the
surface impedance component is determined to possess the resonance points in
which the amplitude of the medium resistance over hydrocarbon deposits has a
pronounced minimum that can be used to identify the media.
When the dielectric constant
of the medium changes, the components of the surface impedance change with the
alteration of both sign of the amplitude and phase of the component, which can
be used to develop methods for electromagnetic exploration, search and
identification of hydrocarbon deposits.
The analysis of the
interaction of impulse signals with the medium over hydrocarbon deposits showed
that the components of the surface impedance possess both capacitive and
inductive character of the resistance. All these lead to the expansion of the
functional dependences of the components of the surface impedance on the probing
modes, which makes possible to improve the accuracy of the hydrocarbon deposit
search methods being developed. Electromagnetic methods for the search and
identification of hydrocarbons can be improved by obtaining information about objects
not only through one or two information channels, but also through the larger
amount of them, which allows us to identify hydrocarbon boundaries against the
backdrop of the underlying medium with a sufficiently high level of reliability.
The results of the study can be applied in search
geophysics.
Key words:
radiopulse signal, anisotropic
medium, hydrocarbon deposit, surface impedance.
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