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Two-dimensional filtering method for a plurality of gathers of digital seismic signal

A two-dimensional filtering and digital signal technology, applied in seismic signal processing and other directions, can solve problems such as aliasing and signal distortion

Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] In order to solve the signal distortion and aliasing phenomenon existing in the prior art, the present invention develops a complex two-dimensional filtering method for seismic digital signals

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  • Two-dimensional filtering method for a plurality of gathers of digital seismic signal
  • Two-dimensional filtering method for a plurality of gathers of digital seismic signal
  • Two-dimensional filtering method for a plurality of gathers of digital seismic signal

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Embodiment Construction

[0049] figure 2 is the CMP (common central point) real number gather of a certain theoretical model, and there are regular linear interference waves such as direct wave and refracted wave in the gather, so it is appropriate to choose hyperbolic transform filter. We first use existing techniques to directly figure 2 The hyperbolic transform filtering is performed on the real number gather, and the filtering result is as follows image 3 , showing that the linear interfering wave has been eliminated, but there is signal distortion.

[0050] Using the technology of the present invention, the figure 2 The cosine phase function gather obtained by Hilbert transform is as follows: Figure 4 , and the instantaneous envelope gather, such as Figure 5 , and then perform hyperbolic transform filtering on the cosine phase function gather, and finally filter the cosine phase function gather, such as Figure 6 ,and Figure 5 The instantaneous envelope gathers are multiplied correspo...

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Abstract

The invention belongs to the technical field of digital signal processing such as seismic exploration data processing and electronic signal processing, and particularly relates to a method for performing two-dimensional filtering to a digital signal. The method comprises the following steps: collecting data gathers of the digital seismic signal; performing Hilbert transformation to the data gathers of the digital seismic signal to obtain cosine phase function gathers and instantaneous envelope gathers of the digital seismic signal; conducting the two-dimensional filtering on the cosine phase function gathers; performing corresponding multiplication to the cosine phase function gathers after two-dimensional filtering and the instantaneous envelope gathers; and outputting the data gathers of the digital seismic signal after the noise, the interfering signal as well as the aliasing phenomenon are eliminated, so as to achieve the purpose of fidelity processing of the digital seismic signal.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing such as seismic exploration data processing and electronic signal processing, and in particular relates to a two-dimensional filtering method for digital signals. Background technique [0002] In the prior art, the two-dimensional filtering methods for seismic digital signals are based on real number gathers, such as τ-p transform filtering, hyperbolic transform filtering and f-k transform filtering and so on. As a well-known technique, the purpose of two-dimensional filtering is to suppress random noise and regular interference signals. In the field of digital signal processing, especially in geophysical seismic data processing, the two-dimensional filtering method of real number gathers has been widely used. However, the two-dimensional filtering method of real number gathers will produce different degrees of aliasing phenomenon while improving the signal-to-noise ratio. The m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 刘志成杨勤勇吴鹏张兵段心标邵志东傅星菊
Owner CHINA PETROLEUM & CHEM CORP
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