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Magneto-electrotelluric signal collection method and device

A magnetotelluric and signal acquisition technology, applied in the field of geophysical exploration, can solve the problems of inability to guarantee the acquisition of data, no high and medium frequency data screening, affecting the quality of MT signal acquisition, etc., and achieve the effect of improving quality and effect and improving data quality.

Active Publication Date: 2010-10-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Application Information

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Problems solved by technology

The disadvantage of this type of method is that the high and medium frequencies are only collected in a very limited time period, and the data in the optimal time period cannot be guaranteed
This type of method has made a big step forward on the basis of the first type of method, but there are still some deficiencies: (1) the high, medium and low real (simultaneous) acquisition (or continuous acquisition) is not realized; (2) there is no Filter high and medium frequency data according to noise level
In MT signal acquisition, since the acquisition time of frequency band 1 is only a few minutes, and the acquisition time of frequency band 2 is within 30 minutes, if strong interference is encountered during the acquisition process, the acquisition quality of MT signals will be seriously affected

Method used

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  • Magneto-electrotelluric signal collection method and device
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  • Magneto-electrotelluric signal collection method and device

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Embodiment Construction

[0037] Further illustrate the present invention below in conjunction with accompanying drawing and embodiment.

[0038] A method for collecting magnetotelluric signals, carried out according to the following steps:

[0039] 1) Let the analog-to-digital converter of the magnetotelluric signal acquisition device convert the analog signal collected by the channel board (analog part) into a digital signal whose frequency is much higher than the highest sampling frequency used for storing data.

[0040] The far greater than in step 1) is greater than 200 times, preferably 256 times.

[0041] 2) Use the over-sampling processing technology, and use the processor (DSP) to extract, filter and notch waves to simultaneously generate real-time 3 frequency bands that can store digital signals.

[0042] The three frequency bands in step 2) are: the sampling frequency of frequency band 1 is generally 1000-3000 Hz, the sampling frequency of frequency band 2 is generally 100-300 Hz, and the s...

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Abstract

The invention relates to a magneto-electrotelluric signal collection method of magneto-electrotelluric exploration, which is characterized in that the frequency which is far more than the storage sampling frequency is used for collecting a signal, when filter wave and trapped wave are extracted, a frequency band which is produced simultaneously is used to store a digital signal, data of a frequency band 3 is continuously collected, data of a frequency band 1 and a frequency band 2 is collected within the collection period of the frequency band 3, on the basis of continuous or discontinuous collection of the data of frequency bands 1 and 2, the magneto-electrotelluric signal noise and interference strength are compared and recorded, if the noise is more than the threshold value corresponding to the data of the frequency band, relevant record is abandoned, and if the noise is lower than the threshold value, the record is stored. The method can obtain correct magneto-electrotelluric signal and can improve the collection quality of the high-frequency and the middle-frequency data.

Description

technical field [0001] The invention belongs to geophysical prospecting technology, in particular to a magnetotelluric survey method, which is a magnetotelluric signal acquisition method. Background technique [0002] The magnetotelluric survey method in geophysical exploration usually collects data through the magnetotelluric (MT) electric field or magnetic field sensor, and the collected electric field or magnetic field signal enters the A / D conversion circuit to output a digital signal through a filtering and amplifying circuit, and is filtered and sampled. After processing such as , gain correction, etc., the MT signal is output to calculate the magnetotelluric impedance, and the calculation result is displayed in a graphic form, which is used to reflect the electrical characteristics of the exploration target. [0003] The MT method collects natural magnetotelluric signals, including electric field and magnetic field signals, which are caused by solar wind and lightning...

Claims

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Application Information

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IPC IPC(8): G01V3/36
Inventor 何兰芳杨轮凯何展翔刘雪军陈儒军
Owner BC P INC CHINA NAT PETROLEUM CORP
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