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

An artificial source and resistivity technology, applied in the field of electromagnetic exploration, to reduce costs, speed up exploration progress, and shorten the exploration cycle.

Active Publication Date: 2016-05-25
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 the three-dimensional change of underground resistivity
  • Three-dimensional artificial source electromagnetic exploration method for measuring the three-dimensional change of underground resistivity
  • Three-dimensional artificial source electromagnetic exploration method for measuring the three-dimensional change 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 . At a selected position in a selected survey area, arrange the transmitting current source (including the transmitter ① and the transmitting electrode ②) of the present invention, and arrange the measuring device described in the present invention in an area separated from the transmitting current source by a certain distance. Line ③ and measuring point ④. Arrange measuring electrodes ⑤ and receivers ⑥ at each measuring point. Start the sending power supply and send the current containing multiple main frequency components described in the present invention to the ground, and simultaneously turn on the receivers on each survey line and each survey point, and simultaneously receive data from the ground that carry the electrical information of underground materials. Geoelectric response signal containing multiple main frequency components. Start ...

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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 prospecting method for measuring the distribution of underground apparent resistivity in prospecting geophysics, especially an electromagnetic prospecting method capable of simultaneously obtaining changes in apparent resistivity of underground space along three directions x, y, and z at one time method. Background technique [0002] The underground is made up of different rocks and minerals. Different rocks and minerals have different resistivities. Measuring the spatial distribution of underground resistivity can find out the location of different rock minerals underground, and achieve the purpose of discovering underground minerals or exploring other underground targets. [0003] The existing artificial source electromagnetic prospecting methods, whether it is the controlled source audio frequency magnetotelluric method in the frequency domain or the transient electromagnetic method in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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