A far-reference magnetotelluric impedance calculation method for wave zone correlation detection

Abstract

The invention discloses a remote reference magnetotelluric impedance calculation method based on wave area correlation detection. The remote reference magnetotelluric impedance calculation method based on wave area correlation detection comprises the steps of: S1, respectively acquiring and measuring time sequence signals of electric and magnetic field components of a base station, a first reference station and a second reference station, furthermore, converting the time sequence signals into frequency domain data through Fourier transform, and performing filtering and amplifying conversion, so that electric and magnetic field digital signals of the base station, the first reference station and the second reference station are respectively obtained; S2-4, forming a cross-power spectrum ofan electric field and a magnetic field of the base station according to the electric and magnetic field digital signals of the base station, furthermore, calculating the electric and magnetic field coherence degree of the base station according to the cross-power spectrum, and obtaining the electric and magnetic field coherence degree of the first and second reference stations in the same way; S5,respectively calculating the magnetic field component coherence degree among the base station, the first reference station and the second reference station as shown in the specification; and S6, judging values as shown in the specification. By means of the method in the invention, the incoherence to noise of the base station and the reference station can be definite; and thus, a sounding curve can be obtained according to the data of the reference station.

Description

technical field [0001] The invention relates to the field of geophysical prospecting, in particular to a far reference magnetotelluric impedance calculation method for wave zone correlation detection. Background technique [0002] The magnetotelluric method (MT) is to observe the naturally changing and mutually perpendicular electromagnetic field components at one or more points on the ground at the same time, to detect the electrical structure inside the earth, and is widely used in mine exploration, oil and gas exploration, etc. . However, when measuring magnetotelluric data, it is often disturbed by noise, which seriously affects the accuracy of subsequent tensor impedance estimation. The far-reference magnetotelluric method is an effective method to eliminate incoherent noise in the noise, but this processing method uses the reference station data that is not disturbed by the non-correlated noise, and corrects the local station's noise based on the non-correlation of th...

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Problems solved by technology

201610204315.7 "A Calculation Method of Far Reference Magnetotelluric Impedance Based on Correlation Detection" (hereinafter referred to as the "previous case") mentioned a method that can improve the accuracy of tensor impedance estimation, but this method is still not very clear about the base station Non-wave zone signal interference with reference station

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