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Trilateral filtering-based blended source data separation method

A hybrid source, trilateral filtering technology, applied in seismology, seismic signal processing, instruments, etc., can solve the problem of not being able to remove mixed noise well, not getting separation results with high signal-to-noise ratio, etc., and achieve a good boundary. Detail information, good retention of effective signals, and the effect of improving acquisition efficiency

Inactive Publication Date: 2017-07-14
JILIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering further improving the collection efficiency and reducing the random delay time range, the mixed noise distribution is obviously more concentrated. The above method cannot remove the mixed noise very well, and the separation result with a high signal-to-noise ratio cannot be obtained.

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  • Trilateral filtering-based blended source data separation method
  • Trilateral filtering-based blended source data separation method
  • Trilateral filtering-based blended source data separation method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0069] (1) FFT transformation is performed on the separated single-shot shot set record;

[0070] (2) The hybrid seismic source corresponding to each frequency ω is recorded as P blω :

[0071] P blω =P iω Γ bl

[0072] Γ bl =e- iωt

[0073] (3) After calculating all the frequencies, convert the mixed source records from the frequency domain to the time domain through IFFT transformation to obtain P bl .

[0074] where ω is the frequency, and t is the delay time of a single shot in the hybrid source;

[0075] d. Computing the actual collected seismic data U and the hybrid source record P synthesized by the separated single-shot records bl The difference between, that is, the remaining mixed signal U dif =U-P bl ;

[0076] e. Coding Γ by mixing sources in the frequency domain bl to U dif Perform pseudo-separation to obtain the single-shot seismic data P′ after pseudo-separation:

[0077]

[0078] Where H represents conjugate transposition, and the pseudo-sepa...

Embodiment 1

[0093] Due to the limitation of hardware equipment, we selected a set of measured single-shot data (containing 100 seismic sources and 100 detectors) in a certain sea area to verify the present invention. We use this set of single-shot data to simulate a set of two-shot mixed source data through step c.

[0094] Simulate mixed source data parameters

[0095] The number of mixed sources is 50, and the number of single shots in each mixed source is 2. The first source and the 51st source form the first mixed source, and the second source and the 52nd source form the second mixed source. source, and so on, the 50th source and the 100th source form the 50th hybrid source. The number of detectors is 100, the total sampling time is 2s, and the sampling rate is 0.002s.

[0096] Based on the trilateral filtering hybrid source data separation parameters are as follows:

[0097] Due to σ I , σ J The smaller the value, the better the mixed noise suppression effect. Since the noise i...

Embodiment 2

[0104] The actual mixed data collection method at sea is full array collection, the length of the geophone line is 10km, the distance between two adjacent geophones is 25m, a total of 400 geophones, the length of the shot line is 8km, and the horizontal distance between two adjacent shot points is 25m, a total of 320 Shot point, two source ships are distributed on both sides of the receiver line, the vertical distances from the receiver line are 100m and 900m respectively, the starting positions of the two source ships are respectively the first shot point and the 161st shot point, and the 320-shot point direction navigation. The sampling time of the geophone is 6s, the sampling interval is 0.002s, and the random delay range is 0.5s.

[0105] Trilateral filtering separation parameters We choose the separation parameters of embodiment 1, the separation results are shown in Figure 7 b and Figure 7 c, it can be seen that the mixed noise is obviously suppressed, Figure 8 The...

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Abstract

The invention relates to a trilateral filtering-based blended source data separation method. The method comprises the following steps: assuming an initial separation result single shot seismic record, blending the single shot seismic record into a blended source record with a blended source operator in the frequency domain, and making a difference with an original field-acquired blended shot record; obtaining a pseudo-separation record by performing pseudo-separation of the difference with the blended shot record by the blended source operator; and using the trilateral filtering denoising method to deal with the common offset domain pseudo-separation record, and adding an obtained result to the initial separation result single shot seismic record to complete an iterative separation. The method can remove all the mixed noise, but also remove some of the effective signal and filter out a large part of the high-frequency information, and the iterative process is a process of adding the high-frequency information to the separation single shot record. The method can not only obtain the satisfactory separation result under the condition that the delay time range is small, and improve the collection efficiency; and the method can remove other random noise while removing the mixed noise, and improve the processing efficiency.

Description

technical field [0001] The invention relates to an efficient acquisition and processing technology for seismic exploration. Mixed seismic sources can effectively improve acquisition efficiency. The invention further improves acquisition efficiency while maintaining the accuracy of processing results by reducing the excitation delay time between mixed seismic sources. Background technique: [0002] Compared with traditional seismic data acquisition, hybrid source acquisition technology has the advantages of improving imaging quality and improving acquisition efficiency. Hybrid source acquisition is multiple sources at different locations that are excited simultaneously or with a certain delay in a certain encoding method, so as to obtain a mixed shot record that interferes with each other. We call the signal excited by the shot point to be studied an effective signal. The signal is called mixed noise, which reduces the signal-to-noise ratio of seismic records and thus has a g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/28G01V1/364G01V2210/324
Inventor 魏亚杰韩立国胡勇靳中原
Owner JILIN UNIV
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