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A Shaping and Filtering Method Aiming at the Correction of Sea Surface Fluctuation Effect in Marine 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: 2021-06-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • A Shaping and Filtering Method Aiming at the Correction of Sea Surface Fluctuation Effect in Marine Seismic Data
  • A Shaping and Filtering Method Aiming at the Correction of Sea Surface Fluctuation Effect in Marine Seismic Data
  • A Shaping and Filtering Method Aiming at the Correction of Sea Surface Fluctuation Effect in Marine 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 2a Schematic diagram for extracting the moment when the abso...

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Abstract

The application discloses a shaping and filtering method aimed at correcting sea surface fluctuation effects in marine seismic data. According to the law of absorption, scattering and attenuation of wave field energy, each channel signal is extracted from the reflection seismic data with direct wave and shallow interference removed. The weighted average of each channel signal is used to eliminate the signal travel time difference caused by the random fluctuation effect of the sea surface, and restore and correct the phase of the seismic signal. Then the amplitude information of each channel signal is weighted and smoothed, and the amplitude of each channel signal is recovered and corrected. Finally, each channel signal extracted from the original data is used as the input, and the calculated accurate signal is used as the expected output, and the deconvolution shaping filter is performed on each channel data, thereby eliminating the amplitude and phase distortion in the data caused by the sea surface fluctuation effect. Under the condition of ensuring that the original information of the data is not destroyed, the invention corrects the distortion caused by the sea surface fluctuation effect in the data, and avoids its adverse influence on the subsequent inversion and imaging results.

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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Patent Type & Authority Patents(China)
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