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Magnetotelluric impedance measuring method

A magnetotelluric and impedance measurement technology, applied in the field of geophysical exploration, can solve problems such as deviations, achieve good results, optimal calculation results, and avoid erroneous results

Active Publication Date: 2007-11-14
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of ground that overcomes the deviation defect of the result of the current single MT impedance measurement technology, can determine the MT impedance measurement step according to the type and data quality of the magnetotelluric signal interference, and can improve the speed of MT impedance calculation. Electromagnetic Impedance Measurement Method

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  • Magnetotelluric impedance measuring method

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Embodiment Construction

[0022] The invention organically combines the least square method, the robust method and the wavelet noise suppression, realizes the calculation of MT impedance step by step, and obtains the optimal result.

[0023] The present invention adopts common method to collect electric field or magnetic field data, converts into digital signal after filtering and amplifying, and the steps are:

[0024] 1) Use the least squares method to calculate the magnetotelluric impedance of the collected signals, and calculate the coherence of the electric field signal and magnetic field signal at the frequency point. If it is not 175-180 degrees, output MT impedance data and complete the MT impedance calculation process, otherwise;

[0025] 2) Use the robust method to calculate the magnetotelluric impedance, and calculate the coherence of the electric field signal and magnetic field signal. If the coherence of more than 75% of the measured frequency points is 0.7-1 and the phase of the impedance...

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Abstract

This invention relates to magnetotelluric survey data signal processing technology. It is a magnetotelluric impedance measurement method. Step: the signal acquisition by the least square method magnetotelluric impedance, and consulate frequency of the electric field and magnetic field signal coherent signal, when more than 75 percent of coherent measurement frequency and impedance in the 0.7-1 phase in the rate of broadband not within the 175-180, magnetotelluric impedance calculation and the results recorded or graphical format. Otherwise, a robust method magnetotelluric impedance type of interference or under the time domain or frequency domain using wavelet automatic threshold pressure on the magnetotelluric method noise signal noise filtering pressure, the invention is conducive to raising magnetotelluric data accuracy and reliability to avoid the man-made factor of magnetotelluric impedance calculation of the impact and relevance of a single judge by MT data quality in near-field presence made an error.

Description

technical field [0001] The invention belongs to geophysical prospecting technology, specifically relates to data processing of magnetotelluric surveying signals, and is a method for measuring magnetotelluric impedance. Background technique [0002] The method of geophysical exploration magnetotelluric survey usually collects data through magnetotelluric (MT) electric field or magnetic field sensor, and the output electric field or magnetic field signal enters the A / D conversion circuit to output digital signal through filtering and amplifying circuit, after filtering, sampling, Gain correction and other processing, output MT signal to calculate the magnetotelluric impedance, and display the calculation results in graphic form to reflect the situation of the exploration target. [0003] To obtain reliable MT measurement data, MT impedance calculation is the key. Since the MT method uses natural electromagnetic field signals as the field source, the two orthogonal electric fi...

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Application Information

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IPC IPC(8): G01V3/00
Inventor 杨轮凯何展翔何兰芳陈儒军
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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