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Three-dimensional artificial source electromagnetic exploration method for measuring three-dimensional changes of underground resistivity

A technology of artificial source and resistivity, applied in the field of electromagnetic exploration, to achieve the effect of speeding up the exploration progress, improving work efficiency and resolution ability, and shortening the exploration cycle

Active Publication Date: 2012-01-04
香港中文大学(深圳)城市地下空间及能源研究院
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing artificial source electromagnetic prospecting methods, and provide a better method that can simultaneously obtain the three-dimensional changes of underground resistivity along the vertical, horizontal and vertical directions at one time. Artificial Source Electromagnetic Prospecting Method

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  • Three-dimensional artificial source electromagnetic exploration method for measuring three-dimensional changes of underground resistivity
  • Three-dimensional artificial source electromagnetic exploration method for measuring three-dimensional changes of underground resistivity
  • Three-dimensional artificial source electromagnetic exploration method for measuring three-dimensional changes of underground resistivity

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Embodiment Construction

[0020] Attached below figure 2 Specific embodiments of the present invention will be described.

[0021] see attached figure 2 . In a selected position of a selected survey area, the transmitting current source (including the transmitter ① and the transmitting electrode ②) according to the present invention is arranged, and in an area separated from the transmitting current source by a certain distance, the surveying current source according to the present invention is arranged. Line ③ and measuring point ④. Arrange measuring electrodes ⑤ and receivers ⑥ on each measuring point. Start the transmission power supply to send the current containing multiple main frequency components into the underground, turn on the receivers on each measuring line and each measuring point synchronously, and simultaneously receive the electrical information from the underground and carry the electrical information of the underground material. A ground response signal containing multiple domi...

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Abstract

The invention discloses a three-dimensional artificial source electromagnetic exploration method for measuring three-dimensional changes of underground resistivity. The method comprises the following steps of: arranging one current sending source or simultaneously arranging more current sending sources in a region to be explored; simultaneously arranging a plurality of measuring lines in the region to be explored, and arranging a plurality of measuring points on each measuring line; simultaneously arranging receiving electrodes or magnetic probes of which the number is the same as that of the measuring points on each measuring point of each arranged measuring line; connecting each measuring receiving electrode or magnetic probe with a corresponding electromagnetic signal receiver by using a guide line; sending a series of exciting current with different frequencies from high to low or from low to high from the current sending source(s) to the underground of the region; simultaneously receiving an electric or magnetic response signal of an underground object on each frequency exciting current by using each receiver; and extracting underground resistivity information from the electric or magnetic response signal. By the method, the efficiency and resolution capability of electromagnetic exploration can be obviously improved, the exploration speed is greatly increased, the cost is reduced, energy resources are saved, and the requirement of rapid economic development on resource exploration is met.

Description

technical field [0001] The invention relates to an artificial source electromagnetic exploration method for measuring underground apparent resistivity distribution in exploration geophysics, in particular to an electromagnetic exploration method capable of simultaneously obtaining the apparent resistivity changes of underground space along three directions of x, y and z at one time. method. Background technique [0002] The underground is composed of different rocks and minerals. Different rocks and minerals have different resistivities. Measuring the spatial distribution of underground resistivity can identify the location of different underground rock minerals, and achieve the purpose of discovering underground minerals or exploring other underground targets. [0003] The existing artificial source electromagnetic exploration methods, whether it is the controllable source audio magnetotelluric method in the frequency domain, or the transient electromagnetic method in the...

Claims

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Application Information

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IPC IPC(8): G01V3/08
Inventor 何继善
Owner 香港中文大学(深圳)城市地下空间及能源研究院
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