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Multi-channel transient electromagnetic (MTEM) virtual wave field extraction device and method

A technology of transient electromagnetic method and virtual wave field, which is applied in the direction of measuring device, electric/magnetic exploration, radio wave measurement system, etc., can solve the problem that the numerical method cannot meet the requirements, and achieve the effect of strong anti-interference ability

Inactive Publication Date: 2016-11-09
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the solution of inverse problems, ordinary numerical methods can no longer meet the requirements

Method used

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  • Multi-channel transient electromagnetic (MTEM) virtual wave field extraction device and method
  • Multi-channel transient electromagnetic (MTEM) virtual wave field extraction device and method
  • Multi-channel transient electromagnetic (MTEM) virtual wave field extraction device and method

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Effect test

Embodiment 1

[0145] In order to verify the virtual wave field extraction effect of correlation superposition method, three extraction methods are used to extract virtual wave field from MTEM data, and their effects are compared. Figure 10 It is the geoelectric model of the embodiment of the present invention, the model is a two-layer horizontal model, the depth of the formation interface is 200m, the resistivity of the upper layer is 100Ω·m, and the resistivity of the lower layer is 10Ω·m. The length of the emission source is 500m, the emission current is 10A, and the receiving point is located 1000m away from the midpoint of the emission source. In order to compare the anti-interference performance of the three methods, 5% random noise is added to the simulation data, and three methods are used to extract the virtual wave field from the noise-free data and the noise-containing data respectively.

[0146] Figure 11-12 It is the result of virtual wave field extraction using singular valu...

Embodiment 2

[0150] In order to compare the actual application effects of different virtual wave field extraction methods, three methods are used to extract the virtual wave field from the MTEM measured data, and their effects are compared.

[0151] The coverage of the Cenozoic in the survey area is relatively thick, and faults are relatively developed in the Huangtuyaoyan Formation and granite porphyry outcropping areas, mainly in the northeast direction (north-west direction), followed by the near-north-south direction. The northeast fault is the main fault in the area. Figure 17 Line map for MTEM. The total length of the survey line is 4.8km, and the angle is 57° from north to east. The emitter pole distance is 240m, and the receiver pole distance is 40m. The emission current is 30A, the frequency is 128Hz, and 10 receivers are used to collect 30 electric field data at the same time. During acquisition, the position of the receiver is fixed, and the transmitter runs poles along the ...

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Abstract

The application provides a multi-channel transient electromagnetic (MTEM) virtual wave field extraction device and method and relates to the field of coalfield hydrogeology and physical geography. The method comprises steps of extracting virtual wave field data of a full time domain diffusion field; extracting virtual wave field data of each split window diffusion field; and performing related superposition of a full time domain extraction result and split window extraction results, and taking the superposition results as a virtual wave field extraction result. A stable and smooth virtual wave field waveform curve can be obtained, and the anti-interference capability is strong.

Description

technical field [0001] The invention relates to the fields of coal field hydrogeology and geophysics, in particular to a multi-channel transient electromagnetic wave field extraction method and device. Background technique [0002] Multi-channel transient electromagnetic (MTEM) appeared in the 1990s and is a new geophysical exploration technology developed in recent years. MTEM technology adopts one-send-multiple-receive and array acquisition method to receive data. At present, MTEM technology is mainly used to detect high-resistivity oil and gas resources, and it can be detected on land and in sea areas with a water depth of several hundred meters. [0003] The data acquisition method of MTEM technology is similar to the seismic method, and data formats such as common offset gathers and common center point gathers can be obtained similar to seismic data. Therefore, the method of transient electromagnetic quasi-seismic interpretation has certain advantages in data processin...

Claims

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Application Information

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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 薛国强李貅智清全钟华森底青云
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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