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Method and device for data collection of controllable source audio-frequency magnetotelluric sounding

An audio magnetotelluric and data acquisition technology, which is applied in the field of geological exploration, can solve problems such as inaccurate data, and achieve the effects of improving acquisition accuracy, eliminating influence, and reducing labor levels

Active Publication Date: 2017-11-07
中国地质科学院地球物理地球化学勘查研究所
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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a controllable source audio frequency magnetotelluric sounding data acquisition method and device, which is used to solve the problem of inaccurate data caused when the fundamental wave and its harmonic interference are large

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[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making...

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Abstract

The invention provides a method and a device for data collection of controllable source audio-frequency magnetotelluric sounding. The method includes: receiving an electric field signal and a magnetic field signal transmitted by a transmitter and propagated through a terrestrial medium; based on the frequency of the electric field signal or a magnetic field signal and the frequency of the power frequency fundamental wave, obtaining a sampling rate and a sampling length; sampling the electric field signal by using the sampling rate and the sampling length to obtain electric field information, and sampling the magnetic field signal by using the sampling rate and the sampling length to obtain magnetic field information; and calculating an electrical structure of the terrestrial medium based on the electric field information and the magnetic field information, wherein the fundamental wave is an artificial power interference signal that affects electric field signal and the magnetic field signal. The invention also discloses a corresponding device for data collection of controllable source audio-frequency magnetotelluric sounding.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a controllable source audio frequency magnetotelluric sounding data acquisition method and device. Background technique [0002] Controlled Source Audio-frequency Magnetotellurics (CSAMT) is an artificial source frequency-domain electromagnetic sounding method in geophysical exploration. By carrying out CSAMT measurement work, the electrical structure of the underground medium can be obtained. It is mainly used for the detection of hidden mineral resources, groundwater resources, fault structures, and stratigraphic structures. However, in CSAMT measurement, there are not only artificially controlled transmission signals, but also various noises, such as random signals of natural electromagnetic fields, receiver noise floor, and power frequency electromagnetic interference dominated by 50Hz and its harmonics. In particular, when the power frequency electromagnetic ...

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Application Information

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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 李建华林品荣刘卫强王珺璐郑采君李勇
Owner 中国地质科学院地球物理地球化学勘查研究所
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