Secondary seismic 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: 2020-12-29
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 seismic source attenuation method for marine seismic data
  • Secondary seismic source attenuation method for marine seismic data
  • Secondary seismic source attenuation method for marine seismic data

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Embodiment

[0066]The following is an embodiment of removing secondary seismic sources from marine seismic data in a work area according to the present invention. The shots are shot alternately at intervals of 12.5 meters, and the record length is 8 seconds. To meet the requirements of short shot time and long record length, the continuous record mode is adopted.

[0067] Figure 4 shows the original single-shot single-cable seismic record in the secondary source attenuation method for marine seismic data according to an embodiment of the present invention, Figure 5 It shows a section diagram composed of the closest traces from the shot point selected from the single-shot single-cable seismic record in the secondary source attenuation method for marine seismic data according to an embodiment of the present invention, Figure 6a It shows the single-shot and single-cable record diagram before removing the secondary source in the secondary source attenuation method for marine seismic data ...

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Abstract

The invention discloses a secondary seismic source attenuation method for marine seismic data. The method comprises the following steps of: acquiring a wave crest of a first strong amplitude in single-shot single-cable seismic data according to a set amplitude threshold in a time window range containing a secondary seismic source water surface direct wave, and determining the minimum starting timeof the water surface direct wave of the secondary seismic source in the single-shot single-cable seismic data; outputting a water surface direct wave model and removing the water surface direct waveof the secondary seismic source in the water surface direct wave model; intercepting the seismic data containing the secondary seismic source, and reconstructing a secondary seismic source reflectionsignal model through a curvelet transform method; and subtracting the reconstructed secondary seismic source reflection signal model from the water surface direct wave model after the water surface direct wave of the secondary seismic source is removed to obtain the seismic data after the secondary seismic source is removed. According to the method, the influence of the secondary seismic source formed by the next shot on the reflection wave energy of the current single-shot deeper stratum is effectively removed, and then the actual data collected by the original seismic record is recovered.

Description

technical field [0001] The invention relates to the field of spherical physical exploration seismic data processing, and more specifically relates to a secondary source attenuation method for marine seismic data. Background technique [0002] There are various irregular interferences in marine seismic data, such as surges, water bird interference, submarine multiples, seawater ringing, external ship interference, and so on. The interference generated by the swell is low-frequency interference, some of which appear as linear interference in single-shot records, and some appear as band interference; water bird interference is mainly caused by water birds hanging foreign objects such as fishnets or cables that are not well balanced. , manifested as a series of low-frequency interferences on the seismic traces near water birds; external interferences, mainly caused by reflections from passing ships or rough seabed point sources, appear as hyperbolas on seismic records, and their...

Claims

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Application Information

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Patent Type & Authority Applications(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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