Q estimation based on logarithmic spectral areas with different high and low frequencies

作     者：An Yong Wang Xin-You 安勇;王新有

作者机构：State Key Laboratory of Petroleum Resource and ProspectingChina University of Petroleum102249BeijingChina CNPC Key Laboratory of Geophysical ExplorationChina University of Petroleum102249BeijingChina China Construction Northeast Design and Research Institute Co.Ltd.110000ShenyangChina. 

出 版 物：《Applied Geophysics》 (应用地球物理（英文版）)

年 卷 期：2021年第18卷第1期

页      面：75-84,129,130页

核心收录：

学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：National Nature Science Foundation of China(Grant No.U1562110) 

主　　题：Attenuation of high-and low-frequency components Quality factor Logarithmic spectral area diff erence 

摘      要：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 *** the depth and the off set increase,the diff erence between the logarithmic spectral areas with high and low frequencies gradually *** on this seismic wave characteristic,we have developed a novel Q-estimation method based on logarithmic spectral area diff erence 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 *** 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 diff erence(LSAD)methods using a synthetic model containing the random *** results demonstrate that the LSAD_LH method is not highly dependent on bandwidth,and in terms of noise immunity,it is signifi cantly better than the LSR method and has the same advantages as the LSAD *** further highlight the advantages of the LSAD_LH method,we apply the LSAD_LH and LSAD methods to the vertical seismic profi ling(VSP)numerical simulation of the multilayer media and the fi eld zero-off set VSP *** 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 ***,via the transmission coeffi cient,the LSAD_LH method overcomes the weakness of the LSAD method.