Pressing method and pressing apparatus for side reflection waves in marine earthquake data

A side reflection wave and seismic data technology, applied in the field of marine seismic data processing, can solve problems such as inability to suppress side reflection waves

Active Publication Date: 2015-07-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing technology cannot effectively suppress side reflection waves, the embodiment of the present invention provides a method and device for suppressing side reflection waves in marine seismic data

Method used

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  • Pressing method and pressing apparatus for side reflection waves in marine earthquake data
  • Pressing method and pressing apparatus for side reflection waves in marine earthquake data
  • Pressing method and pressing apparatus for side reflection waves in marine earthquake data

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Embodiment 1

[0056] as attached figure 1 As shown, the embodiment of the present invention provides a method for suppressing side reflection waves in marine seismic data, the method is:

[0057] 101. Analyze the marine seismic data to obtain the total reflected wave information of the marine seismic. The total reflected wave information of the marine seismic at least includes: the travel time of the side reflected wave, the propagation speed of the side reflected wave in seawater, and the incident incident wave of the side reflected wave. Angle, offset distance, propagation speed of effective reflected wave in sea water and geographic coordinates of source.

[0058] 102. According to the total reflection wave information of the marine seismic, calculate the geographic coordinates of the side reflection source in the marine seismic data.

[0059] 103. According to the information of the total reflection wave of the marine seismic, the wave field of the side reflection wave at the geographi...

Embodiment 2

[0063] figure 2 It is a flow chart of a method for suppressing side reflection waves in marine seismic data provided by an embodiment of the present invention. see figure 2 , the method is:

[0064] 201. Analyze the marine seismic data to obtain the total reflected wave information of the marine seismic. The total reflected wave information of the marine seismic at least includes: the travel time of the side reflected wave, the propagation speed of the side reflected wave in seawater, and the incident incident wave of the side reflected wave Angle, offset distance, propagation speed of effective reflected wave in sea water and geographic coordinates of source.

[0065] Wherein, the marine seismic data is actually collected actual seismic gather data, and the actual seismic gather data includes total marine seismic reflection wave information composed of side reflection waves and effective reflection waves. The travel time of the side reflected wave is the time it takes fo...

Embodiment 3

[0107] An embodiment of the present invention provides a device for suppressing side reflection waves in marine seismic data, the device comprising:

[0108] The analysis module is used to analyze the marine seismic data to obtain the total reflected wave information of the marine seismic. The total reflected wave information of the marine seismic includes at least: the travel time of the side reflected wave, the propagation velocity of the side reflected wave in seawater, the side reflected wave The incident angle of the wave, the offset distance, the propagation speed of the effective reflected wave in the sea water and the geographic coordinates of the gun source.

[0109] The calculation module is used to calculate the geographical coordinates of the side reflection source in the marine seismic data according to the total reflected wave information of the marine seismic data.

[0110] The simulation module is used for simulating the wave field of the side reflection wave a...

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Abstract

The present invention discloses a pressing method for side reflection waves in marine earthquake data, and belongs to the field of marine earthquake data treatment. The pressing method comprises: analyzing marine earthquake data to obtain marine earthquake total reflection wave information; according to the information, calculating the geographical coordinate of the side reflection source; simulating the wave field of the side reflection waves at the geographical coordinate through the wave field equation of diffraction waves; and on the wave field of the marine earthquake total reflection wave, using a matching subtraction method to remove the stimulated wave field of the side reflection waves. According to the present invention, the geographical coordinate of the side reflection source is calculated and the wave field of the side reflection waves at the geographical coordinate is stimulated to accurately position the side reflection source so as to really and comprehensively obtain the side reflection wave information; the matching subtraction method is used to remove the stimulated wave field of the side reflection waves; and the method is not limited by the frequency spectrum forms of the side reflection wave and the effective reflection wave, the side reflection wave can be effectively pressed, the effective reflection wave can be protected and enhanced, and the signal to noise ratio of the marine earthquake data can be improved.

Description

technical field [0001] The invention relates to the field of marine seismic data processing, in particular to a method and device for suppressing side reflection waves in marine seismic data. Background technique [0002] Offshore seismic data is acquired through offshore seismic reflection wave exploration and reflects the underground structure, which is of great significance for offshore exploitation of underground oil and gas resources. In the process of offshore seismic exploration, the reflection wave excited by the source is affected by the high and steep seabed terrain, passing ships, islands and reefs, etc., which will produce linear or hyperbolic side reflection waves. The signal-to-noise ratio of seismic data may even completely cover the effective underground reflection waves, which have strong energy and wide distribution, seriously affecting the quality of marine seismic data. Therefore, it is necessary to suppress the side reflection waves in marine seismic da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/30
Inventor 王童奎路鹏飞郭爱华李莹孙明何青城李浩宇
Owner PETROCHINA CO LTD
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