DETERMINATION OF THE CONTRAST OF REFLECTIVE CHARACTERISTICS OF ANISOTROPIC MEDIA OVER HYDROCARBONS IN THE MODE OF AMPLITUDE-MODULATED SIGNAL
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Abstract
A study of the reflectivity contrast of an anisotropic medium above hydrocarbons was conducted using amplitude-modulated signals. Modeling was performed for experimentally obtained characteristics of host rocks above oil and gas fields. Patterns of change in the reflectivity contrast with variations in the angles of incidence of electro-magnetic waves on the studied terrain profile and the modulation frequency of the carrier oscillation were established to expand the testing modes in organizing geological exploration work. It was noted that during longitudinal propagation of amplitude-modulated signals along the contour of the geoprofile surface, it is possible to use the carrier signal frequency and modulation frequency, at which the cutoff frequency of the frequency response of the radiotechnical system exists for the search and delineation of oil and gas fields. Frequencies of the carrier signal and modulation were determined for which the contrast of the reflectivity of the medium above hydrocarbons is minimal in the mode of longitudinal propagation of electromagnetic waves along the studied deposit surface. The obtained results of modeling the interaction of amplitude-modulated signals with environments above hydrocarbons can be applied in exploration geophysics to develop methods for detecting oil and gas deposits.
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References
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