Processing of the seismic Rayleigh wave data of coalfields based on the improved phase-shift method

LI Xin-Xin; LI Jiang; LIU Jun; SHEN Hong-Yan

doi:10.11720/wtyht.2022.0078

2022 Vol. 46, No. 6

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Article navigation > Geophysical and Geochemical Exploration > 2022 > 46(6): 1470-1476

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LI Xin-Xin, LI Jiang, LIU Jun, SHEN Hong-Yan. 2022. Processing of the seismic Rayleigh wave data of coalfields based on the improved phase-shift method. Geophysical and Geochemical Exploration, 46(6): 1470-1476. doi: 10.11720/wtyht.2022.0078

Citation:

LI Xin-Xin, LI Jiang, LIU Jun, SHEN Hong-Yan. 2022. Processing of the seismic Rayleigh wave data of coalfields based on the improved phase-shift method. Geophysical and Geochemical Exploration, 46(6): 1470-1476. doi: 10.11720/wtyht.2022.0078

Processing of the seismic Rayleigh wave data of coalfields based on the improved phase-shift method

1. College of Earth Sciences & Engineering,Xi'an Shiyou University,Xi'an 710065,China；
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi'an Shiyou University,Xi'an 710065,China；
3. SINOPEC Key Laboratory of Geophysics,Nanjing 211103,China；
4. Xi'an Research Institute Co. Ltd.,China Coal Technology and Engineering Group Corp.,Xi'an 710077,China

Received Date: 24 February 2022

Revised Date: 20 December 2022

Publish Date: 03 January 2023

Abstract

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.
- Rayleigh wave /
- phase-shift method /
- dispersion curve

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References

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