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Waveform self-adaptive matching vibroseis harmonic elimination method and system

A technology of self-adaptive matching and harmonic elimination, applied in seismology, seismic signal processing, measurement devices, etc., can solve problems such as inability to directly process post-data, and achieve the effect of eliminating harmonic interference

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Abd El-Aal (2010) and Claudio Bagaini (2010) derived harmonic prediction operators in time domain and frequency domain respectively to predict harmonic noise in post-correlation seismic records, but it requires pre-correlation data and cannot be directly processed post-correlation data

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  • Waveform self-adaptive matching vibroseis harmonic elimination method and system
  • Waveform self-adaptive matching vibroseis harmonic elimination method and system

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Embodiment Construction

[0049] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0050] The invention provides a filtering method based on waveform matching. The reference scanning signal in the source characteristic signal is used as a matched filter channel, and an adaptive filter operator is designed to act on the output signal of the source that generates harmonic distortion to eliminate the noise in the output signal. harmonic interference. Calculate the amplitude change coefficient between the original output sign...

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Abstract

The invention provides a waveform self-adaptive matching vibroseis harmonic elimination method and system. The method comprises the following steps: extracting a reference scanning signal and an output signal in a vibroseis characteristic signal; taking the reference scanning signal as a waveform matching channel, and carrying out matched filtering on the output signal and the reference scanning signal channel by adopting a self-adaptive matching method; solving amplitude change coefficients before and after filtering of the output signal; and applying the amplitude change coefficients to thefiltered output signal. According to the method, the reference scanning signal in the seismic source characteristic signal is used as a matched filtering channel, a self-adaptive filtering operator isdesigned to act on a seismic source force signal generating harmonic distortion, and harmonic interference in the force signal is eliminated. According to the method, the amplitude change coefficients of an original force signal and the filtered force signal are obtained, the filtered amplitude is processed by the coefficients, effective signal amplitude information in the force signal is effectively reserved, and finally the purpose of eliminating harmonic interference in the vibroseis force signal is achieved.

Description

technical field [0001] The invention belongs to the field of seismic data processing, and provides a vibrator harmonic elimination method and system for waveform self-adaptive matching by extracting effective signals from output signals of a vibrator and eliminating harmonic interference signals. Background technique [0002] During the exploration process of the vibrator, the output signal of the vibrator is distorted due to the nonlinearity of the mechanical device of the vibrator and the vibration device, as well as the coupling between the vibration plate and the ground. When the source plate transmits the scanning signal to the ground, it also transmits the harmonic interference of an integer multiple of the reference signal to the ground. According to the multiple of its frequency, this kind of harmonic interference is divided into second harmonic, third harmonic and nth harmonic in turn. [0003] Scholars at home and abroad have proposed many methods to eliminate hig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/307
Inventor 张洁殷厚成
Owner CHINA PETROLEUM & CHEM CORP
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