Secondary source attenuation method for marine seismic data

A technology for seismic data and seismic source, which is applied in the field of seismic data processing of spherical physical exploration, can solve the problem of not checking overlapping sources or effective removal methods of secondary sources, etc., and achieves the effect of improving quality and improving low signal-to-noise ratio.

Active Publication Date: 2022-08-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

There is no effective removal method for overlapping seismic sources or secondary seismic sources in the literature, and there is no ready-made method and technology that can be directly applied

Method used

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  • Secondary source attenuation method for marine seismic data
  • Secondary source attenuation method for marine seismic data
  • Secondary source attenuation method for marine seismic data

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Embodiment

[0066]The following is an example of removing secondary earthquake sources in accordance with the present invention of marine earthquake data. The 12.5 -meter -free distance is used alternately, and the record length is 8 seconds. For the requirements of the short gun time and the length of the record length, the continuous recording mode is used.

[0067] Figure 4 It shows that the original single -gun single -cable seismic record diagram is used in the secondary seismic attenuation method for an embodiment of an embodiment for the present invention. Figure 5 It shows that the secondary earthquake source attenuation method used for marine earthquake data based on the invention of the invention is selected from the cutting view of the nearest road of the gun in the single -cable seismic record of the single -gun and single cable seismic. Figure 6A It shows that a single -gun single cable recording diagram of the secondary earthquake source is removed in the secondary seismic atte...

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Abstract

The invention discloses a secondary source attenuation method for marine seismic data. Including: obtaining the first strong amplitude peak in the single-shot and single-cable seismic data within the time window that includes the water surface direct waves of the secondary source according to the set amplitude threshold, and determining the magnitude of the secondary source in the single-shot and single-cable seismic data. The minimum starting time of the water surface direct wave; output the water surface direct wave model and remove the water surface direct wave of the secondary source in the water surface direct wave model; cut out the seismic data including the secondary source, and reconstruct the secondary source by the curvelet transform method Reflected signal model: subtract the reconstructed reflected signal model of the secondary seismic source from the water surface direct wave model after removing the water surface direct wave of the secondary source to obtain the seismic data after eliminating the secondary source. The above method effectively removes the influence of the secondary source formed by the next shot on the reflected wave energy of the deep formation of the current single shot, and then restores the actual data collected by the original seismic record.

Description

Technical field [0001] The invention involves the field of seismic data processing of ball physical exploration, and more specifically, it involves a secondary earthquake attenuation method for marine earthquake data. Background technique [0002] There are various irregular interference in marine earthquake data, such as surge, water bird interference, multiple waves under the sea, seawater shocks, external ship interference, and so on. The interference of Yonglang is low -frequency interference. Some of the manifestations of single cannon records are linear interference, and some are manifested as band -like interference; water bird interference is mainly caused by water birds such as foreign objects such as fish nets or cables. It shows a bunch of low -frequency interference on the earthquake road near the waterbird; external interference is caused by the reflection of the nearby ships or rugged submarine dots. Changes in changes; multiple wave interference is one of the most ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V1/362Y02A90/30
Inventor 赵艳平高鸿朱成宏庞海玲陈世军张改兰姜大建
Owner CHINA PETROLEUM & CHEM CORP
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