摘要：When a seismic wave propagates through subsurface visco.lastic 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 co.pare 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 co.taining 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 co.ffi cient,the LSAD_LH method overco.es the weakness of the LSAD method.