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Method and device for picking up travel time of first arrival of noisy seismic signal

A seismic signal and noise technology, applied in seismic signal processing, seismology, measurement devices, etc., can solve problems such as difficulty in obtaining accurate first arrival time

Inactive Publication Date: 2019-01-25
EAST CHINA UNIV OF TECH
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Problems solved by technology

[0003] The object of the present invention is to provide a method and device for picking up the first-arrival time of noisy seismic signals to solve the problem that it is difficult to obtain accurate first-arrival time when there is random noise interference in natural or artificial seismic data. Noise ratio, improving the accuracy of seismic first arrival travel time picking

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  • Method and device for picking up travel time of first arrival of noisy seismic signal

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[0077] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0078] This embodiment is a method and device for picking up the first arrival travel time of noisy seismic signals, see the attached figure 1 to attach Figure 9 shown. In the embodiment of the present invention, first, the original noisy seismic signal is decomposed by CEEMDAN to obtain IMF components at various levels, and the effective index function of EIF is used to determine the energy boundary point between the effective signal and noise, and the wavelet t...

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Abstract

The invention discloses a method and device for picking up the first arrival travel time of a noisy seismic signal. The method includes the following steps: using a self-adaptive noise complete set empirical mode decomposition method to decompose and process the original noisy seismic signal s(t) to obtain a A series of limited IMF components and residual components from high frequency to low frequency; filter some high frequency IMF components according to the effective index function of EIF for wavelet threshold denoising; denoise the high frequency IMF components and low frequency without processing by wavelet threshold method The IMF component and the residual component are accumulated and reconstructed to obtain the denoised seismic signal x(t). The improved sliding time window energy ratio method is used to preliminarily determine the first arrival travel time t0; the AIC information criterion method is used to calculate the local minimum value within the time window around time t0, and the corresponding time of the minimum value is the accurate first arrival travel time t. The method in the invention can effectively improve the effect of suppressing seismic noise and the picking accuracy of the first arrival travel time, and create conditions for the accuracy of subsequent seismic data processing and interpretation.

Description

technical field [0001] The invention relates to the technical field of seismic data processing in geophysical exploration, in particular to a method and device for picking up the first arrival travel time of noisy seismic signals. Background technique [0002] The propagation of seismic waves in a limited-area medium takes time, and the first-arrival data of the seismic signal when it propagates from the source (excitation point) to the receiver (detection point) contains the physical characteristics (state, density, etc.) inside the medium. First arrival wave (P wave) travel time picking of seismic records is a basic and important work in seismic tomography forward modeling and static correction technology, which is of great significance for source location, reservoir description, and geological defect distribution detection. The manual picking of first arrival travel times is no longer in line with the needs of large-scale seismic exploration data today. The general compu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/362G01V2210/32
Inventor 温志平方江雄刘花香刘军杨志超候庆明孟宪武王有情李翀欧塬圩刘洋郑成龙吴新华
Owner EAST CHINA UNIV OF TECH
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