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A Transient Electromagnetic Passive Source Exploration Method

A transient electromagnetic and passive source technology, applied in the field of ground exploration, can solve the problems of not being able to know the vertical distribution of the formation conductivity, not being able to extract the conductivity, and low measurement accuracy, so as to achieve rich excitation frequencies, save manufacturing costs, and high resolution high effect

Active Publication Date: 2022-07-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the transient electromagnetic field received at a distance is the response after attenuation and phase shift, which is quite different from the waveform of the excitation source.
[0004] At the same time, the inventor found that the existing exploration methods have low measurement accuracy, are easy to damage the environment, cannot extract the profile of conductivity changing with depth from the measured transient electromagnetic random waveform, and cannot know the vertical distribution of formation conductivity

Method used

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  • A Transient Electromagnetic Passive Source Exploration Method
  • A Transient Electromagnetic Passive Source Exploration Method
  • A Transient Electromagnetic Passive Source Exploration Method

Examples

Experimental program
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Embodiment 1

[0029] A transient electromagnetic passive source exploration method, such as Figures 1 to 4 shown, including the following steps:

[0030] S1. Select a reference point. The reference point can be a reference electrode, and a signal receiving array is arranged. A plurality of signal receiving units are evenly distributed in the signal receiving array. Each signal receiving unit surveys and receives the transient electromagnetic signal of the reference point. Random signal, wherein, the signal receiving array is a regular hexagon, and the center and each vertex of the regular hexagon are provided with signal receiving units, and each signal receiving unit is the same electrode, so that the signal receiving array is provided with 7 identical make the signal receiving unit located in the center of the signal receiving array as the measuring point S1, move the signal receiving array and measuring point S1 according to the preset translation distance, and record the translated mea...

Embodiment 2

[0123] The difference between this embodiment and Embodiment 1 is that, such as Figure 5 As shown, the electrodes of the signal receiving array in step S1 are arranged as nested triangles, and signal receiving units are arranged at the center and each vertex of the triangle, and each signal receiving unit is the same electrode.

[0124] Other steps in this embodiment are the same as those in Embodiment 1, and are not repeated here.

[0125] Obviously, the exploration method of the present invention can receive the natural transient electromagnetic signal, then process the collected transient electromagnetic signal to obtain the velocity dispersion curve, and further obtain the conductivity-depth curve. -Drawing the depth curves together, the profile of the conductivity changing with the depth can be obtained, and the fine detection of the near-surface area can be realized according to the formation conductivity information.

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Abstract

The invention belongs to the technical field of ground exploration, and in particular relates to a transient electromagnetic passive source exploration method. Set up measuring points in the signal receiving array, make the translation path of the measuring points form a survey line, explore and receive transient electromagnetic random signals along the survey line, and then construct the velocity dispersion curve, conductivity dispersion curve and depth-conductivity curve, The change curves of conductivity with depth at all positions of the survey line are represented by color, and they are drawn together to form a section of the change of conductivity with depth, and the longitudinal distribution of formation conductivity is obtained. The method can realize the fine detection of the near-surface area according to the formation conductivity information, and the operation is convenient and reliable, and the original environment will not be damaged. method.

Description

technical field [0001] The invention belongs to the technical field of ground exploration, and particularly relates to a transient electromagnetic passive source exploration method. Background technique [0002] In the process of ground exploration and underground space development, random signal measurement of vibration excited by passive sources can effectively obtain the spatial distribution of formation shear wave velocity, which can be applied to formation exploration in many fields. [0003] After the transient electromagnetic field is excited, it propagates and diffuses in the conductive stratum in two ways: displacement current and conduction current. Different from electromagnetic waves, the amplitude of transient electromagnetic fields attenuates during the diffusion process. Different frequencies have different attenuation amplitudes during diffusion. Low frequency attenuation is small, and the diffusion area is large. High frequency attenuation is large, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08G01V3/38
CPCG01V3/08G01V3/38
Inventor 沈建国陈锐
Owner TIANJIN UNIV