A full-coverage anti-interference artificial source electromagnetic detection method

Abstract

The present invention provides a full-coverage anti-interference artificial source electromagnetic detection method, comprising the following steps: (1) determining the range and position of the survey area; (2) field survey, determining the position of the transmitting source and the angle of the transmitting antenna; (3) Calculate the maximum polarization direction angle of the electric field generated by the antenna at the measuring point; (4) lay out the electric field sensor according to the polarization direction; (5) calculate the apparent resistivity of each measuring point. The method of the invention can obtain the earth resistivity by using the obtained reliable data with a high signal-to-noise ratio, the field construction is flexible and convenient, the construction efficiency is high and the cost is low, the method is reliable and effective, and the invention provides a new direction for the development of the electromagnetic prospecting method.

Description

technical field [0001] The invention relates to the technical field of electromagnetic exploration, in particular to a full-coverage anti-interference artificial source electromagnetic detection method. Background technique [0002] The electromagnetic prospecting method is a method to obtain the electrical parameters, distribution and structure of the earth's interior by observing, analyzing and processing the earth's electromagnetic field. Due to different detection targets, different observation equipment, different observation systems, different observation data, different processing and interpretation methods, the branches of electromagnetic prospecting methods have formed a variety of different methods. [0003] The frequency domain artificial source electromagnetic method has a transmission source whose signal strength and frequency can be manually controlled, and the transmission frequency range is 2 -2 to 2 13 Hz, the detection depth can be changed by changing the...

AI Technical Summary

Problems solved by technology

It can be seen that at the edge of the trapezoidal area, the field strength is obviously weaker, the anti-interference ability is poor, and the data quality at the edge of the detection area is poor

Due to the small effective signal coverage, when the survey line is long, the emission source must be moved and re-deployed, resulting in low construction efficiency, high construction cost and poor data quality

[0009] The existing technology requires the signal receiver to record the electric field and magnetic field signals at the same time, so it is necessary to deploy electric field sensors and magnetic field sensors at the same time in the field, which is inconvenient for construction

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