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Shaping and filtering method for correcting sea surface fluctuation effect in ocean seismic data

A seismic data, shaping and filtering technology, applied in the field of shaping and filtering, to avoid the effect of influence

Active Publication Date: 2020-06-23
JILIN UNIV
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  • Application Information

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Problems solved by technology

So far, there are no specific algorithms and procedures on how to eliminate sea surface fluctuation effects have been reported in the literature

Method used

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  • Shaping and filtering method for correcting sea surface fluctuation effect in ocean seismic data
  • Shaping and filtering method for correcting sea surface fluctuation effect in ocean seismic data
  • Shaping and filtering method for correcting sea surface fluctuation effect in ocean seismic data

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Embodiment

[0044] A method for correcting and shaping filtering of sea surface fluctuations in marine seismic data, comprising the following steps:

[0045] A. Read in the common shot domain seismic data and data sampling interval with the direct wave and shallow interference information removed; in addition, according to the above information, parameters such as the filter operator length, signal extraction length, and amplitude smoothing times in the program need to be given. In a specific embodiment: the data has 25 tracks in total, and the track spacing (spatial sampling interval) is 10m; 150 sampling points in each track, and the sampling interval is 4ms; the filter operator length is 80, the signal extraction length is 40, and the amplitude smoothing times are 1 ;

[0046] B. According to the known conditions read in step a, use the law of absorption, scattering and attenuation of wave field energy. according to figure 2 The schematic diagram of a, extracting the moment when the...

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Abstract

The invention relates to a shaping and filtering method for correcting a sea surface fluctuation effect in marine seismic data, and the method comprises the steps: extracting each channel signal in reflected seismic data after a direct wave and shallow interference are cut off through a wave field energy absorption, scattering and attenuation rule; and carrying out weighted averaging on each channel of signals, so that signal travel time difference caused by the random fluctuation effect of the sea surface is eliminated, and the seismic signal phase is recovered and corrected; then weighting and smoothing the amplitude information of each channel of signal, and recovering and correcting the amplitude of each channel of signal; finally, performing deconvolution shaping filtering on each channel of data by taking each channel of signals extracted from the original data as input and taking each channel of accurate signals obtained by calculation as expected output, thereby eliminating amplitude and phase distortion in the data caused by a sea surface fluctuation effect. According to the method, under the condition of ensuring that original information of the data is not damaged, distortion generated by the sea surface fluctuation effect in the data is corrected, and adverse effects of the distortion on subsequent inversion and imaging results are avoided.

Description

technical field [0001] The invention relates to a marine seismic prospecting method, in particular to a shaping and filtering method for signal extraction and correction of amplitude and phase information in seismic data aimed at the sea surface fluctuation effect in marine seismic data. Background technique [0002] In recent years, with the transfer of exploration targets from land to ocean and the rise of high-precision time-lapse seismic at sea, the influence of undulating seas on reflection seismic data and imaging results has gradually been paid attention to. Different from the traditional horizontal interface assumption, the actual sea surface is a complex surface with random fluctuations. This complex curved surface will cause complex scattering of seismic waves, which will affect the propagation law of the wave field and the target area information carried by the observation data. This effect is mainly manifested in two aspects: 1. The irregular undulating shape of...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/362G01V1/366G01V2210/324G01V2210/532
Inventor 孟祥羽孙建国刘明忱徐则双
Owner JILIN UNIV