MT (magnetotelluric) denoising device and method

Abstract

The invention relates to an MT denoising device which comprises an electromagnetic receiver, a magnetic induction sensor and a non-polarizable electrode group, wherein the electromagnetic receiver is placed on the ground; the magnetic induction sensor is placed on the ground in a direction parallel to an x axis or a y axis and connected with the electromagnetic receiver through a cable; the non-polarizable electrode group takes a coordinate system origin as a central point, is placed symmetrically along the y axis or the x axis and grounded, and comprises a first long pole pitch electric dipole and a first short pole pitch electric dipole; the first long pole pitch electric dipole is used for measuring amplitude data of a long pole pitch electric field, and the first short pole pitch electric dipole is used for measuring amplitude data of a short pole pitch electric field; and all non-polarizable electrodes are connected with the electromagnetic receiver through wires. The device is used for calculating the correlation coefficient and the standard deviation between the amplitude data of the long pole pitch electric field and the short pole pitch electric field, when the correlation coefficient is smaller than a set correlation threshold, electric field amplitude data with largest standard deviation are removed, the correlation coefficient is calculated repeatedly until the correlation coefficient is larger than or equal to the set correlation threshold, and near field interference data are effectively removed.

Description

technical field [0001] The invention relates to the field of electrical prospecting, in particular to a magnetotelluric denoising device and a magnetotelluric denoising method which use a data correlation analysis method to judge the nature of a field source and remove interference noise. Background technique [0002] As an important exploration geophysical method, the magnetotelluric method has a wide range of applications and many branches. Since the first proposal, the audio frequency magnetotelluric method (AMT) was proposed in the 1960s. In 1971, Professor D.W.Strangbway of the University of Toronto in Canada and his graduate student Myron Goldstein proposed the Controlled Source Audio Magnetotelluric Method (CSAMT). These methods (MT, AMT, CSAMT) all determine the resistivity value of the subsurface by observing the electric and magnetic field signals of natural plane electromagnetic waves caused by far-field sources. Among them, the geoelectric field observation res...

AI Technical Summary

Problems solved by technology

However, the above is not completely effective, and sometimes suppresses some useful signals while suppressing interference noise

Therefore, artificial denoising is still an indispensable means in electromagnetic data processing, but the human factors of this method are relatively high, so the operator's experience plays a decisive role, and there is no accurate method to rely on.

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