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A Method for Separation of Uplink and Downlink Wavefields Based on Non-Gaussian Maximization

A separation method and Gaussian technology, which is applied in the field of separation of upstream and downstream wavefields of double-detection signals based on maximization of non-Gaussianity, and can solve problems such as being unsuitable for on-site actual data processing and inability to meet

Active Publication Date: 2016-10-05
CNOOC ENERGY TECH & SERVICES
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Problems solved by technology

However, in actual marine seismic data acquisition, the above assumptions are generally difficult to meet, and are not suitable for processing actual data on site, and cannot meet the needs of practical applications.

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  • A Method for Separation of Uplink and Downlink Wavefields Based on Non-Gaussian Maximization
  • A Method for Separation of Uplink and Downlink Wavefields Based on Non-Gaussian Maximization
  • A Method for Separation of Uplink and Downlink Wavefields Based on Non-Gaussian Maximization

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Embodiment Construction

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0047] The embodiments of the present invention utilize the super-Gaussian distribution characteristics of seismic signals [8] to realize the separation of uplink and downlink wave fields in the time-space domain. According to the formulas (1a) and (1b), the embodiment of the present invention separates the wave field track by track, thereby avoiding the assumption that the detectors are evenly distributed and the recording surface is a plane, which is more in line with the actual data processing, see figure 1 and figure 2 , see the description below:

[0048] 101: Establish an objective function based on non-Gaussian maximization;

[0049] Considering that the embodiment of the present invention separates the uplink and downlink wavefields track by track in the time-space do...

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Abstract

The invention discloses a dual-check signal uplink and downlink wave field separating method based on non-Gaussian maximization and relates to the field of seismic signal processing in the seismic exploration technology. According to the method, uplink and downlink wave field separation of a dual-check signal can be achieved in a time-space domain by means of the super-Gaussian distribution characteristics of seismic signals; uplink and downlink wave field separation is achieved according to the non-Gaussian maximization norm by representing the non-Gaussian property of seismic signals with L1 norm; the defect that a traditional frequency-wave number domain method is based on the hypothesis that wave detectors are evenly distributed and the premise that a recording surface is a plane is overcome, and therefore the method is better adapted to actual data processing, and various requirements in actual application are met.

Description

technical field [0001] The invention relates to the field of seismic signal processing in seismic exploration technology, in particular to a method for separating uplink and downlink wave fields of double detection signals based on non-Gaussian maximization. Background technique [0002] In marine seismic exploration, since the seawater and air contact surface is a strong reflective surface, there are excitation point and reception point ghost waves in the collected seismic data. The existence of ghost waves will suppress low-frequency components and cause notches in the frequency domain, thereby reducing the resolution of seismic records, causing aliasing of events in seismic records and even false events. In order to obtain accurate seismic record sections, it is necessary to suppress ghost waves as much as possible. [0003] Van Melle and Weatherborn [1] The ghost wave was first described in detail in the physical essence, and the ghost wave can be effectively identifie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 方中于陆文凯万欢孙雷鸣吴耀乐于宏赫建伟
Owner CNOOC ENERGY TECH & SERVICES
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