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Magnetotelluric data acquisition system and method

A technology of magnetotelluric and acquisition systems, applied in the field of applied geophysical exploration, to achieve the effects of wide application prospects, low production costs, and fewer instruments and equipment

Active Publication Date: 2015-02-25
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to solve the technical problem in the prior art that two different data acquisition systems need to be used to separately collect low-frequency magnetotelluric data and high-frequency or audio frequency magnetotelluric data, and provide a Acquisition system and method for collecting broadband magnetotelluric data

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Embodiment Construction

[0025] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described The embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

[0026] In order to make the above objectives, features and advantages of the application more obvious and understandable, the application will be further described in detail below in conjunction with the drawings and specific implementations.

[0027] In the following description, the frequency range of low-frequency magnetotelluric data is 0.00001 to 300...

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Abstract

An embodiment of the invention provides a magnetotelluric data acquisition system comprising a data acquisition station and a broadband magnetic field sensor. The data acquisition station is capable of acquiring magnetotelluric data and high-frequency or audio magnetotelluric data in the same time; the broadband magnetic field sensor is capable of switching high and low frequencies. According to the magnetotelluric data acquisition system and method, three acquisition modes for different exploration purposes are provided. In the acquisition mode 1, high-frequency or audio magnetotelluric data is acquired; in the acquisition mode 2, at any observation point, low-frequency magnetotelluric data and high-frequency or audio magnetotelluric data are acquired in sequence, the low-frequency magnetotelluric data and the high-frequency or audio magnetotelluric data can be integrated in a broadband magnetotelluric data file; in the acquisition mode 3, the low-frequency magnetotelluric data is acquired. The magnetotelluric data acquisition system has such advantages that production cost is low, data acquisition efficiency is high, field production operations are simple and reliable, and few instruments or devices are used.

Description

Technical field [0001] The invention belongs to the field of applied geophysical prospecting, and specifically relates to a magnetotelluric data acquisition system and an acquisition method thereof. Background technique [0002] Magnetotellurie (MT for short) in geophysical exploration appeared in the early 1950s and was proposed by L. Cagniard in France and ANTikhonov in the Soviet Union. . It is a geophysical method that uses natural electromagnetic fields as the field source, also known as the Magnetotelluric Method. In a sense, it can be said to be the development of the earth current method. When the alternating electromagnetic field propagates underground in the form of waves, reflection and refraction occur at the interface of different media, which can bring information about the resistivity distribution of underground media. In fact, by measuring the horizontal electric field component E of the surface at various frequencies X (Or E Y ), and the orthogonal horizontal ...

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Application Information

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IPC IPC(8): G01V3/08
Inventor 余刚何展翔孙卫斌
Owner BC P INC CHINA NAT PETROLEUM CORP
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