An electromagnetic prospecting method with automatic synchronous frequency conversion for sending and receiving
An automatic synchronization and electromagnetic technology, applied in the field of geophysical exploration, can solve the problems of not being able to correct the measurement problems in time according to the situation, not being able to understand the measurement results in a timely and intuitive manner, and reducing the participation of field engineers, so as to reduce high-speed data transmission and large-scale Capacity data storage requirements, reduced complexity, strong anti-interference ability
Active Publication Date: 2015-10-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
The on-site engineers cannot understand the measurement results in a timely and intuitive manner, and cannot correct the measurement problems in a timely manner according to the situation, which reduces the participation of the on-site engineers and reduces the use effect of the instrument
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[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0046] The block diagram of the frequency conversion electromagnetic prospecting system with automatic synchronization of transmission and reception is as follows: figure 1 shown. The survey system applying the method of the present invention mainly includes a transmitter and a receiver. The transmitter feeds a current signal of a certain frequency and magnitude to the earth through the sending electrode, as an artificial excitation source, and the frequency of the sent current signal is automatically switched according to the preset "time-frequency table". The receiver receives the magnetotelluric response synchronously according to the same "time-frequency table" as the transmitter, and filters out the noise through the correlation detection method to obtain the magnetotelluric response containing the ground resistivity information with a hi...
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Disclosed is an electromagnetic prospecting method capable of achieving self-synchronizing frequency conversion of receiving and sending. A sending machine provides a current signal serving as an artificial excitation source and with certain frequency and capacity for the ground through a sending electrode. The frequency of the sent current signal switches automatically according to a preset 'time-frequency table'. A receiving machine synchronously receives a magnetotelluric response according to the same 'time-frequency table' as the sending machine. Uncorrelated noise is removed with relevant detecting methods, a magnetotelluric response containing geoelectrical resistivity information is obtained, and finally distribution of geoelectrical resistivity is worked out.
Description
technical field [0001] The invention relates to a new geophysical prospecting method, in particular to an electromagnetic prospecting method in the frequency domain. Background technique [0002] Controlled source frequency domain electromagnetic prospecting is an important means of geophysical prospecting. The principle of the controllable source frequency domain electromagnetic method is based on the fact that the penetration depth of electromagnetic signals in the ground is closely related to the conductivity of the underground medium and the frequency of the electromagnetic waves used. High-frequency electromagnetic waves penetrate shallowly and reflect shallow information; low-frequency electromagnetic waves penetrate deeply to understand deep underground information. The controllable source frequency domain electrical method has a very wide range of applications in the search for underground metal deposits, geological disaster detection, water resource distribution, c...
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IPC IPC(8): G01V3/08
Inventor 夏正武李艳红刘国强李士强夏慧
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI