Multi-component universe apparent resistivity defining method based on multiple-radiation-field-source transient electromagnetic method

Abstract

The invention discloses a multi-component universe apparent resistivity defining method based on multiple-radiation-field-source transient electromagnetic method. The corresponding multi-component universe apparent resistivity defining method is established on the basis of the multiple-radiation-field-source air-ground transient electromagnetic method theoretical system. The system analyzes the advantages for carrying out universe apparent resistivity defining of a multiple-radiation-field-source air-ground system by utilizing magnetic field intensity, a respective universe apparent resistivity algorithm is put forward for each component of the magnetic field intensity, multi-component, full-time-domain and full-airspace apparent resistivity calculation is achieved, and influences of the offset distance on the universe apparent resistivity are analyzed. A multiple-radiation-field-source transient electromagnetic air-ground system can reinforce signal intensity and weaken random disturbance, and the positions of underground abnormal bodies can be recognized better by adjusting the relative positions between sources. The effectiveness of the multi-component universe apparent resistivity algorithm of the multiple-radiation-field-source air-ground system is verified through treatment on a designed model, and the advantages, of increasing exploration depth and improving resolution, of the multiple-radiation-field-source air-ground system are verified.

Description

Technical field

[0001] The invention relates to a definition method, and relates to a multi-component global apparent resistivity definition method of a multi-radiation field source transient electromagnetic method. Background technique

[0002] The ground-air transient electromagnetic method has been successfully applied in the fields of geothermal survey, volcanic structure, groundwater salinization and groundwater monitoring. Because the electrical source ground-air system still belongs to the scope of the time domain electromagnetic method, and the time domain electromagnetic method is particularly suitable for deep , Concealed mineral deposit exploration, so this method also has great development potential in mineral exploration. The current situation of China’s mining industry is very severe. On the one hand, the reserves of old mines are depleting day by day, and on the other hand, there are fewer and fewer newly discovered deposits. Therefore, the state has clearly propos...

Examples

Embodiment Construction

[0041] The technical solution of the present invention will be further described in detail below in conjunction with specific drawings and embodiments.

[0042] 1 Theory and analysis

[0043] 1.1 Multi-radiation field source ground-air system theory

[0044] figure 1 (a) shows a schematic diagram of the coordinate system where the electric dipole is located on a uniform earth surface. AB represents the electric dipole on the earth's surface. The center of the electric dipole is the origin of the coordinate system O, and the z-axis points to the earth. The entire coordinate system satisfies In the right-handed coordinate system, M represents a measurement point at any position in the sky. The distance between it and O is R, the projection of M on the surface is P, and the distance between P and O is r, which is the offset mentioned in this article. figure 1 (b) shows the top view of the coordinate system of the multi-radiation field source, A i B i Indicates the i-th electrical source...

Technical field

[0001] The invention relates to a definition method, and relates to a multi-component global apparent resistivity definition method of a multi-radiation field source transient electromagnetic method. Background technique

[0002] The ground-air transient electromagnetic method has been successfully applied in the fields of geothermal survey, volcanic structure, groundwater salinization and groundwater monitoring. Because the electrical source ground-air system still belongs to the scope of the time domain electromagnetic method, and the time domain electromagnetic method is particularly suitable for deep , Concealed mineral deposit exploration, so this method also has great development potential in mineral exploration. The current situation of China’s mining industry is very severe. On the one hand, the reserves of old mines are depleting day by day, and on the other hand, there are fewer and fewer newly discovered deposits. Therefore, the state has clearly propos...

Examples

Embodiment Construction

[0041] The technical solution of the present invention will be further described in detail below in conjunction with specific drawings and embodiments.

[0042] 1 Theory and analysis

[0043] 1.1 Multi-radiation field source ground-air system theory

[0044] figure 1 (a) shows a schematic diagram of the coordinate system where the electric dipole is located on a uniform earth surface. AB represents the electric dipole on the earth's surface. The center of the electric dipole is the origin of the coordinate system O, and the z-axis points to the earth. The entire coordinate system satisfies In the right-handed coordinate system, M represents a measurement point at any position in the sky. The distance between it and O is R, the projection of M on the surface is P, and the distance between P and O is r, which is the offset mentioned in this article. figure 1 (b) shows the top view of the coordinate system of the multi-radiation field source, A i B i Indicates the i-th electrical source...

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