Electromagnetic method and system for acquiring resistivity based on horizontal and vertical magnetic fields
A vertical magnetic field and resistivity technology, applied in the field of geophysical exploration, can solve the problems of difficult and accurate measurement of emission efficiency, achieve the effects of large radiation range, simple layout, and improved operation efficiency
Active Publication Date: 2021-11-09
CENT SOUTH UNIV
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[0003] Secondly, for the artificial source electromagnetic method, it is difficult to measure the emission efficiency accurately in actual observation, so it is very important to eliminate the influence of emission efficiency in the calculation of apparent resistivity
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[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.
[0024] It should be noted that the steps shown in the flowcharts of the accompanying drawings may be implemented in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.
[0025] In this embodiment, an electromagnetic method for obtaining resistivity based on horizontal and vertical magnetic fields is provided, Figure 4 It is a flowchart of an electromagnetic method for obtaining resistivity based on horizontal and vertical magnetic fields according to an embodiment of the present application, and the process includes ...
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The invention discloses an electromagnetic method and system for acquiring resistivity based on horizontal and vertical magnetic fields. The method comprises the following steps: controlling a transmitter in a pre-arranged field source to transmit a current signal through two electrodes; obtaining horizontal and vertical magnetic field signals of an observation point at the observation point; obtaining the apparent resistivity according to the position relation between the observation point and the two electrodes and the horizontal and vertical magnetic field signals, wherein the apparent resistivity is the basis for calculating stratum information. According to the invention, emission and reception are separated, a ground current source is simple to arrange, signals are strong, the radiation range is large, and magnetic field signal observation can be carried out on the ground and in the air; the method has no azimuth limitation on horizontal magnetic field observation, and can realize wide-azimuth electromagnetic ground detection; the apparent resistivity is strictly defined based on horizontal and vertical magnetic field component formulas, geoelectric information can be accurately reflected, and the influence of field source emission efficiency on electromagnetic sounding can be eliminated.
Description
technical field [0001] The present application relates to the field of geophysical exploration, in particular, to an electromagnetic method and system for obtaining resistivity based on horizontal and vertical magnetic fields. Background technique [0002] Over the years, the wide-area electromagnetic method has adopted the "E-E" method, that is, by laying out current sources on the ground and observing the electric field on the surface to obtain geoelectric information, and a series of major research and exploration results have been achieved. However, it is rarely used in the observation of magnetic field components, especially in the case of poor terrain conditions and inconvenient ground operations. The use of magnetic field information to achieve ground detection will give full play to the advantages of wide-area electromagnetic methods. [0003] Secondly, for the artificial source electromagnetic method, it is difficult to measure the emission efficiency accurately in ...
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IPC IPC(8): G01V3/08G01V3/38
CPCG01V3/08G01V3/38
Inventor 李帝铨何继善蒋奇云张乔勋
Owner CENT SOUTH UNIV