Artificial field source frequency domain electrical prospecting method and prospecting system

Abstract

Provided are an artificial field source frequency domain electrical prospecting method and a prospecting system. A series of waveform current signals fed into the underground serve as artificial excitation sources, the frequency of the waveform current signals changes randomly, and the randomness of the frequency change of the waveform current signals is similar to the randomness of white noise. Simultaneously, waveforms of sent signals and waveforms of received signals are recorded synchronously. According to the principle of signal correlation, interference signals with correlation of the sent signals and the received signals as zero can be removed by means of the correlation of the sent signals and the received signals, information required by geological prospecting can be obtained, and the signal-to-noise ratio of geological prospecting signals and the resolution ratio of the geological prospecting are improved. The prospecting system applying the prospecting method mainly comprises a transmitter and a receiver, wherein the transmitter is used for transmitting random square-wave or bell-wave signals within a whole preset frequency range by one time, the receiver is used for receiving the random square-wave or bell-wave signals with geoelectric information transmitted by the transmitter, and a global position system (GPS) is utilized to perform synchronous control between the transmitter and the receiver. The artificial field source frequency domain electrical prospecting method and the prospecting system are suitable for prospecting of China's multiple mountain mineral deposits.

Description

technical field [0001] The invention relates to an exploration geophysical method, in particular to an artificial random field source frequency domain electrical exploration method and a detection system. Background technique [0002] As one of the important means of geological prospecting, frequency-domain electrical prospecting mainly studies the change of earth diploping resistivity with signal frequency. The basic principle of its sounding can be simply attributed to the "skin effect" of electromagnetic waves. When the electromagnetic wave is transmitted underground, it will carry the geoelectric information of the stratum it passes through, and the depth of the electromagnetic wave of different frequencies is different in the underground. The higher frequency detects the shallower stratum, and the lower frequency detects the deeper stratum. The frequency domain electrical method is widely used in the exploration of underground metal deposits, distribution of water resou...

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Problems solved by technology

However, due to the above frequency domain electrical method, the field source signal frequency is less and the waveform is single. In order to avoid various interferences from the outside world and itself, the method of increasing the transmission power of the instrument has to be used to improve the signal-to-noise ratio of the received signal, so as to improve the detection. Resolution, the purpose of deepening the detection depth, but the increase in power will inevitably lead to an increase in the cost and volume of the detection equipment, and the cumbersome equipment will reduce the detection efficiency

In addition, considering that our country's mineral resources are mostly hidden in complex terrain such as mountainous areas, it is not conducive to the transportation and use of such large equipment

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