Abstract
The article presents the simulation of the interaction of electromagnetic waves in the mode of video pulse signals with the medium over hydrocarbon deposits. The analysis of the spectra of reflected video pulse signals from the medium over hydrocarbons is carried out. A study of the propagation of radio waves over hydrocarbons is carried out within the framework of a quasihydrodynamic approximation. The choice of the frequencies of video pulse signals is due to the determination of media characteristics over deposits at great depths compared to the surface of the earth. The spectrum of reflected signals from an anisotropic medium above a hydrocarbon deposit in the mode of video pulse signals can be used to determine the electrodynamic characteristics of the medium over the deposit over a wide range of frequencies of probed signals, dielectric permittivities and conductivity of media. The ability to reconfigure a geo-prospecting device from one mode to another (pulse width adjustment) in the presence of a deposit complements the functionality to search for hydrocarbon deposits. Electromagnetic methods for the search for and identification of hydrocarbons can be improved by obtaining information about objects through several information channels, which allows them to be identified with a sufficiently high level of reliability on the background of the underlying environment. The depths of occurrence, the resolving power in the investigated frequency range are determined. The results of the research can be used to develop new electromagnetic methods for the search for hydrocarbon deposits.
Highlights
The article presents the simulation of the interaction of electromagnetic waves in the mode of video pulse signals with the medium over hydrocarbon deposits
The choice of the frequencies of video pulse signals is due to the determination of media characteristics over deposits at great depths compared to the surface of the earth
The spectrum of reflected signals from an anisotropic medium above a hydrocarbon deposit in the mode of video pulse signals can be used to determine the electrodynamic characteristics of the medium over the deposit over a wide range of frequencies of probed signals, dielectric permittivities and conductivity of media
Summary
Проведен анализ зависимостей амплитуды видеоимпульса от частоты f при длительности импульса τu = 1 мс для различных глубин h. 3, при увеличении частоты видеоимпульса уменьшается амплитуда. Формулы (1), (8), (14) показывают, что при возрастании частоты увеличивается коэффициент распространения волны γ2, вследствие чего увеличивается коэффициент затухания α, что ведет к уменьшению амплитуды отраженного видеоимпульса. Также с увеличением глубины амплитуда отраженного видеоимпульса резко уменьшается и шаг уменьшения амплитуды с увеличением частоты становится больше. При уменьшении длительности видеоимпульса затухание ЭМВ возрастает: приведенные на рис. 4 зависимости амплитуды видеоимпульса от глубины h и частоты f при fu = 25 · 102 Гц свидетельствуют об этом. При разработке аппаратуры для поиска и выделения УВЗ приходится сталкиваться с проблемами обеспечения требуемых затуханий ЭМВ и разрешающей способности по глубине обнаружения. Характеристики ЭМВ для различных участков земной поверхности Characteristics of an electromagnetic wave for different parts of the earth’s surface
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