Device and method for whole-region measurement of vertical components of current source frequency domain magnetic fields

Abstract

The invention provides a device and a method for whole-region measurement of vertical components of current source frequency domain magnetic fields. The device comprises a transmission power supply, a current transmitter, a power supply electrode, at least one electromagnetic reception apparatus and at least one magnetic bar, wherein the power supply electrode is connected with the current transmitter; the magnetic bar is connected with the electromagnetic reception apparatus; the current transmitter is a single-frequency or 2n sequence pseudorandom multi-frequency current transmitter; the transmission power supply is arranged in an appointed area and connected with the current transmitter, and is used for generating and transmitting current containing one or more main-frequency components by the current transmitter and transmitting the current underground through the power supply electrode; the electromagnetic reception apparatus is arranged in a target area which is an appointed transmission / reception distance away from the transmission power supply, and is used for receiving magnetic field response, generated by the ground, of one or more frequencies containing electric distribution information of underground matters in the vertical direction through the magnetic bar connected with the electromagnetic reception apparatus, so as to obtain the vertical components of the magnetic fields with different frequencies at the current test position and then realize the whole-region detection of the underground electric distribution.

Description

technical field [0001] The invention relates to the field of prospecting geophysics, in particular to a device and method for measuring the vertical component of the magnetic field in the frequency domain of a current source in the whole area. Background technique [0002] In the early 1950s, Tikhonov of the former Soviet Union and Carniard of France independently proposed to measure the mutually orthogonal electric and magnetic fields to calculate the apparent resistivity of the earth, which laid the theoretical foundation for the magnetotelluric method (MT). MT has the advantages of using natural field sources, plane wave theory, and large detection depth, but it also has the disadvantages of weak signals and random field sources. Goldtein improved the magnetotelluric method in 1971, and proposed to use artificial field sources instead of natural field sources, and to measure in areas far away from the field source (far area, generally 9 times the detection depth), and thu...

AI Technical Summary

Problems solved by technology

CSAMT overcomes the shortcomings of MT field source randomness and weak signal, but it requires measurement in the far zone, and still uses the Carnia formula to calculate the apparent resistivity, discards many high-order terms representing the characteristics of non-far zones, and introduces a large human error

The current CSAMT method has large errors, low work efficiency and low precision, and it is difficult to meet the needs of rapid economic development for resource exploration

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