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Magnetotelluric instrument performance evaluation method

A technology of magnetotelluric and evaluation methods, applied in geophysical measurement, instruments, etc., can solve the problems of inability to effectively determine the difference, inability to evaluate the magnitude of MT instrument related interference, inability to evaluate the magnitude of MT instrument interference, etc., to achieve reliable performance evaluation. Effect

Active Publication Date: 2011-05-18
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The difference between an MT instrument with a signal-to-noise ratio of 40dB and another MT instrument with a signal-to-noise ratio of 100dB cannot be effectively determined by correlation curve and amplitude spectrum curve analysis
[0005] Second, this method can only evaluate the size of the random noise inside the MT instrument, but cannot evaluate the size of the related interference inside the MT instrument
When there is related interference in each channel, the parallel test will only increase the correlation of the collected signals between the channels, so that the amplitude of the collected signals of each channel will be more consistent and the correlation will be higher, making it impossible to evaluate the size of the related interference inside the MT instrument

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0043] attached figure 1 A flow diagram for implementing the invention is given.

[0044] An embodiment of the present invention for V5-2000MT instrument evaluation is realized by the following steps:

[0045] Step 1: MT instrument working parameter setting. According to the magnetotelluric prospecting data acquisition method, set the working parameters of V5-2000, including sampling mode, magnification, filter and other parameters.

[0046] Step 2: The signal input terminal of the MT instrument is grounded. Connect the electric field signal input terminals E, W, S, N of V5-2000 to the signal ground terminal of V5-2000 respectively; according to the connection diagram of the magnetic field signal terminal provided by V5-2000, connect the input terminal of the magnetic field signal to V5 The signal ground terminal of -2000.

[0047] Step 3: Collect time s...

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Abstract

The invention relates to geophysical exploration technology and discloses a magnetotelluric instrument performance evaluation method, which comprises that: electric field and magnetic field signal input ends are connected with a signal ground end to acquire time sequence data 1, the same signal accesses the electric field and magnetic field signal input ends, a time sequence data 2 is acquired, and power spectrum calculation is carried out to obtain an auto power spectrum and a cross power spectrum of each channel of sequences 1 and 2; and a correlation function, a signal to noise ratio and a noise power spectrum of any two channels are calculated according to auto power spectrums and cross power spectrums of the sequences 1 and 2, and coherent jamming and random noise of the MT instrument are determined. The method can quantitatively identify the MT instrument with the signal to noise ratio of 100dB and the MT instrument with the signal to noise ratio of 120dB. By quantitatively calculating the random noise and the coherent jamming in the MT instrument, the performance of the MT instrument is reliably evaluated.

Description

technical field [0001] The invention relates to a magnetotelluric detector for geophysical exploration, and relates to a performance evaluation method for a magnetotelluric detector. Background technique [0002] Magnetotelluric prospecting is an important prospecting method in geophysical prospecting, and has important applications in oil and gas prospecting, geothermal prospecting, tectonic prospecting, and crustal, volcanic and seismic studies. The magnetotelluric sounding (MT) instrument is an instrument for realizing magnetotelluric exploration, and its performance is directly related to the effect of magnetotelluric exploration, and to improve the performance of the instrument requires an accurate evaluation of the performance of the MT instrument. [0003] At present, the parallel test method is mainly used to evaluate the performance of MT instrument. During the test, the same signal is first input into each channel of the MT instrument, and after the signal is coll...

Claims

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Application Information

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IPC IPC(8): G01V13/00
Inventor 何展翔陈儒军刘雪军何兰芳
Owner BC P INC CHINA NAT PETROLEUM CORP
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