Man-machine interaction type deep sea water body three-dimensional velocity analysis method integrated with reflection amplitude compensation

A reflection-amplitude, interactive technique used in seismology, seismology, instrumentation, etc. for areas covered by water

Active Publication Date: 2021-01-08
JILIN UNIV
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Problems solved by technology

[0005] But so far, there has been no report on the method of using human-computer interaction to compensate the amplitude of seawater for weak reflection of seawater, and accurately analyzing the speed of seawater.

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  • Man-machine interaction type deep sea water body three-dimensional velocity analysis method integrated with reflection amplitude compensation
  • Man-machine interaction type deep sea water body three-dimensional velocity analysis method integrated with reflection amplitude compensation
  • Man-machine interaction type deep sea water body three-dimensional velocity analysis method integrated with reflection amplitude compensation

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Experimental program
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Embodiment

[0050] a. Read in the deep-water reflection seismic data and observation system parameters of the multi-shot common center point that have undergone processing processes such as direct wave cutting, shallow interference information suppression, and formation reflection removal. In addition, parameters such as NMO stretching zero value, similar length smoothing window value, and similar value weight need to be given. In a specific embodiment: there are 125 channels of common central point data, the shot spacing is 10m, and the receiving channel spacing is 10m; each channel has 1000 time sampling points, and the sampling interval is 5ms; the NMO stretching zero value is 1.5, and the similar length smoothing window value is 3, and the similar value weight is 1;

[0051] b. According to the known conditions read in step a, carry out weighted average calculation on the absolute value of the wave field amplitude value in each channel of deep-water seismic data, and extend the window...

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Abstract

The invention relates to a man-machine interaction type deep sea water body three-dimensional velocity analysis method integrated with reflection amplitude compensation. Deep water reflection seismicrecord event coordinate information after weighted average shaping filtering is picked up through man-machine interaction to obtain a compensation function, a compensation function value is extractedfrom multi-shot common midpoint reflection seismic data with direct waves and shallow interference removed, energy compensation is conducted on seawater reflection in a reflection seismic record through the compensation function value, and meanwhile background noise interference such as bubble scattering is eliminated through filtering calculation. Three-dimensional velocity analysis is performedby utilizing the processed data to obtain root-mean-square velocity distribution of the deep sea water body. According to the method, under the condition of ensuring that original information of the data is not damaged, accurate velocity analysis for water layer reflection is realized through ways of extracting and compensating weak useful information in the original data, and a relatively accurate initial model is provided for seawater sound velocity profile inversion and final migration imaging and full waveform.

Description

technical field [0001] The invention belongs to the technical field of marine seismic exploration, in particular to a method for analyzing the velocity of deep sea water with smooth gradient changes, in particular to a human-computer interactive three-dimensional velocity analysis method for deep sea water with integrated reflection amplitude compensation. Background technique [0002] In recent years, as an emerging interdisciplinary subject of geophysics and physical oceanography, seismic oceanography has applied conventional seismic reflection methods to ocean data processing, and has significantly demonstrated the advantages of high-resolution, short-term reflection imaging of large-scale water bodies, etc. . In marine seismology, the processing of reflection seismic sections is particularly important, which is the basis for using AVO technology to study the difference in physical properties of seawater. However, the conventional marine seismic method is to deal with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/38G01V1/28G01V1/30
CPCG01V1/288G01V1/30G01V1/38G01V1/3808
Inventor 高子傲孙建国
Owner JILIN UNIV
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