基于改进相移法的煤田地震瑞利波资料处理

doi:10.11720/wtyht.2022.0078

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Abstract

The phase-shift method is commonly used to extract the Rayleigh wave dispersion curves.However,in the case of a complex wave field,the dispersion spectra calculated using the phase-shift method have a low resolution of Rayleigh wave dispersion energy,reducing the accuracy of the dispersion curves.This study improved the phase-shift method by obtaining the power exponent of the amplitude of each point on the dispersion spectra to improve the convergence and focusing properties of the dispersion energy.The improved phase-shift method was used to process the simulated data of the theoretical stratigraphic model and the actual seismic data of a coalfield in a certain study area.The processing results were compared with the dispersion spectra generated using the conventional phase-shift method.Moreover,the inversion based on dispersion curves of the actual data was conducted to generate a two-dimensional (2D) S-wave velocity section of the study area.As revealed by the study results,the improved phase-shift method can enhance the signal-to-noise ratio of the Rayleigh wave signals in the frequency-velocity domain and improve the resolution of the dispersion energy spectra and the accuracy of the dispersion curves.

Key words： Rayleigh wave phase-shift method dispersion curve

Received: 24 February 2022 Published: 03 January 2023

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	Articles by authors
	Xin-Xin LI
	Jiang LI
	Jun LIU
	Hong-Yan SHEN

Cite this article:

Xin-Xin LI,Jiang LI,Jun LIU, et al. Processing of the seismic Rayleigh wave data of coalfields based on the improved phase-shift method[J]. Geophysical and Geochemical Exploration, 2022, 46(6): 1470-1476.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.0078 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I6/1470

A comparison chart of the original amplitude curve and the curve after amplitude equalization
a—the original multi-peak amplitude curve;b—the curve after the 4^th power operation

Stratum parameters of the theoretical model

Numerical simulation of theoretical model
a—simulated seismic data;b—dispersive energy generated by the conventional phase-shift method;c—dispersive energy generated by the improved phase-shift method

Original shot record
a—160~360 trace record of the 1^st shot;b—186~210 trace record of the 1^st shot

Dispersive energy spectrum generated by conventional phase-shift method(a) and improved phase-shift method(b)

The dispersion curve of the 1^st shot (a) and the shear wave velocity structure of the formation below the 1^st shot(b)

2D shear wave velocity structure section in the study area

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