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Ground-space electromagnetic prospecting method in frequency domain

A technology of frequency domain and electromagnetic detection, applied in the field of airborne electromagnetic method, can solve the problems of small observation range and achieve the effect of high detection efficiency, wide detection range and large detection depth

Active Publication Date: 2017-03-29
JILIN UNIV
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  • Claims
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Problems solved by technology

This method achieves high-power transmission and improves the exploration depth, but the detection depth is still much smaller than that of the ground frequency domain electromagnetic method, and there is a shortcoming of a small observation range

Method used

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  • Ground-space electromagnetic prospecting method in frequency domain
  • Ground-space electromagnetic prospecting method in frequency domain
  • Ground-space electromagnetic prospecting method in frequency domain

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing and example for further detailed description:

[0040] figure 1 Shown is a schematic diagram of the ground-air electromagnetic prospecting system in the frequency domain. The ground-air electromagnetic prospecting system consists of a transmitting system 1 working on the ground, a receiving system 2 working in the air, and a remote monitoring system 3 based on GPRS. The transmitting system consists of one or a group of long ground wires 5 distributed in parallel and equally spaced, a transmitter 4 and a recording device 6 for transmitting current. Each transmitter transmits a single-frequency square wave or a pseudo-random wave containing multiple frequency components to the ground through a long ground wire. The receiving system is composed of a magnetic sensor 7 , a receiver 8 and an aircraft 9 , and measures the magnetic field signal in the air under the control of the GPRS monitoring system 3 .

[0041]In the frequenc...

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Abstract

The invention relates to a novel frequency domain ground-to-air electromagnetic prospecting method which adopts a work mode of land launching and air receiving of electromagnetic waves to extract signal frequency spectrums and gives the underground electrical structure an inverse interpretation through a whole-region apparent resistivity method. A launching system which works on the ground launches multi-frequency pseudo-random waves towards the underground through multiple cascades and the signal with multiple frequencies can be obtained with one triggering, thereby greatly improving the detection efficiency. A receiving system is loaded on an aircraft, so when measuring the magnetic fields in the testing zone, it can adapt to the environment of complex surface structures, reduce the static effect caused by the near field effect and expands the detection range of electromagnetic prospecting. The receiving system can correct and compensate tested magnetic-field components when measuring multiple magnetic-field components, so the resolution capability of magnetic field measurement is improved. The frequency domain ground-to-air electromagnetic prospecting method is applicable to depth detection of severe surface zones and has the advantages of being wide in detection range, large in detection depth, high in detection efficiency, etc.

Description

[0001] Technical field: [0002] The invention relates to an airborne electromagnetic method, in particular to a frequency-domain ground-air electromagnetic prospecting method suitable for deep exploration in areas with complex surface environments. [0003] technical background: [0004] As an important exploration geophysical method, the electromagnetic method has a wide range of applications and many branches. Metal mineral exploration is a traditional field of application of electromagnetic methods. With the development of our country's economy, the application field of electromagnetic method has been expanded to many fields such as groundwater exploration, engineering exploration, oil and gas resource exploration, marine resource exploration and geological survey, especially in recent years in the study of the deep structure of the earth and geodynamics. The rise has provided a good opportunity for the development of electromagnetic law. [0005] There are many kinds of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/00
Inventor 林君康利利刘长胜刘立超周海根周逢道曾新森史志辉王爽
Owner JILIN UNIV
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