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Method and system for recovering low-frequency weak signal of marine seismic data

A seismic data and weak signal technology, applied in seismic signal processing, seismology in areas covered by water, etc., can solve the problems of time-consuming, low-frequency weak signal recovery and distortion of marine seismic data, and achieve sub-wave side lobes Small, good signal-to-noise ratio maintenance, stable algorithm effect

Active Publication Date: 2019-08-27
中海油海南能源有限公司 +1
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Problems solved by technology

[0005] In view of this, the present invention provides a method and system for recovering low-frequency and weak signals of marine seismic data, which solves the technical problems in the prior art that the recovery of low-frequency and weak signals of marine seismic data is distorted and time-consuming

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  • Method and system for recovering low-frequency weak signal of marine seismic data
  • Method and system for recovering low-frequency weak signal of marine seismic data
  • Method and system for recovering low-frequency weak signal of marine seismic data

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[0053] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the related application, not to limit the application. In addition, it should be noted that, for ease of description, only parts relevant to the present application are shown in the drawings.

[0054] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0055] Such as figure 1 as shown, figure 1 It is a schematic flowchart of the method for recovering low-frequency weak signals of marine seismic data described in this embodiment. This embodiment discloses a low-frequency and weak signal recovery technology for marine seismic d...

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Abstract

The invention discloses a method and a system for recovering a low-frequency weak signal of marine seismic data. The method comprises the steps of: acquiring seismic channel data, gaining an originalreflection coefficient, and performing convolution to obtain first seismic record data; calculating a first residual error between the first seismic record data and the seismic channel data, and modifying a reflection coefficient to obtain a first dense reflection coefficient sequence; obtaining second seismic record data by performing convolution on the first dense reflection coefficient sequenceand far-field wavelets constrained by a Yu wavelet spectrum; calculating a second residual error between the second seismic record data and the seismic channel data, and modifying the reflection coefficient to obtain a second dense reflection coefficient sequence; performing iterative computation to obtain a reflection coefficient of low-frequency weak signal recovery; constraining the far-fieldwavelet to obtain a broadband wavelet for recovering the low-frequency weak signal; and performing convolution to obtain seismic data subjected to low-frequency recovery. According to the method, a weighting factor of a low-frequency end is obtained within the frequency domain, so that the low-frequency signal of a seismic signal source is recovered.

Description

technical field [0001] The present invention relates to the technical field of seismic exploration data processing, more specifically, to a method and system for recovering low-frequency weak signals of marine seismic data. Background technique [0002] With the development of oil and gas reservoir types becoming increasingly complex and the requirements of refined offshore exploration, low-frequency signals have been widely concerned and utilized because of their strong penetration and slow attenuation, which just meet such requirements. Theory and practice show that enhancing the low frequency or recovering the weak signal at the low frequency end can greatly improve the resolution of seismic data and improve the stability and reliability of the subsequent inversion of seismic data. Low-frequency weak signal recovery is one of the important research contents of modern seismic data processing, and it is also a hot and difficult point in current research. [0003] In the pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36G01V1/38
CPCG01V1/36G01V1/38
Inventor 赫建伟谢玉洪裴健翔邓勇邓盾任婷王瑞敏黎孝璋鲁统祥彭海龙张文祥史德锋
Owner 中海油海南能源有限公司
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