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When a seismic wave propagates through subsurface viscoelastic media, the formation absorbs the high-frequency energy of the seismic wave more strongly than the low-frequency energy. As the depth and the offset increase, the difference between the logarithmic spectral areas with high and low frequencies gradually increases. Based on this seismic wave characteristic, we have developed a novel Q-estimation method based on logarithmic spectral area difference of high and low frequencies (referred to as the LSAD_LH method). In this paper, we derive the theoretical relationship between the Q value and difference of logarithmic spectral areas with high and low frequencies and prove the applicability of the LSAD_LH method using a single-layer medium numerical model. To verify the sensitivity of the LSAD_LH method to bandwidth selection and noise, we compare the LSAD_LH method with two credible methods—the logarithmic spectral ratio (LSR) and logarithmic spectral area difference (LSAD) methods using a synthetic model containing the random noise. The results demonstrate that the LSAD_LH method is not highly dependent on bandwidth, and in terms of noise immunity, it is significantly better than the LSR method and has the same advantages as the LSAD method. To further highlight the advantages of the LSAD_LH method, we apply the LSAD_LH and LSAD methods to the vertical seismic profiling (VSP) numerical simulation of the multilayer media and the field zero-offset VSP data. The application of the two cases proves the applicability of the LSAD_LH method and the accuracy of the high Q-value estimation relative to the LSAD method. Moreover, via the transmission coefficient, the LSAD_LH method overcomes the weakness of the LSAD method.
Applied Geophysics – Springer Journals
Published: Mar 1, 2021
Keywords: Attenuation of high- and low-frequency components; Quality factor; Logarithmic spectral area difference
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