Abstract：In view of the fact that seismic amplitude attenuation varies with the absorption of different frequency contents, and based on wavelet transform theory, we put forward a new processing method for compensating spherical divergence and absorption in the time-frequency domain. The method includes the following points: ·Absorption factor is decomposed into surface-consistent absorption component and earth absorption component by analysing the geophysical mechanism of amplitude attenuation. ·Seismic record is decomposed into different frequency traces by using the characteristic of wavelet decomposition. ·Low-frequency energy absorption curve that varies with time and offset is drawn to compensate its corresponding frequency trace. ·Each frequency trace is then converted into the seismic record that has undergone compensation, removing the negative influence of earth absorption upon seismic amplitude. ·Surface-consistent absorption can be eliminated in the late processing steps such as surface-consistent deconvolution. Theoretical and practical results indicate that the method compensate quite desirably the amplitude attenuation due to spherical divergence and earth absorption.
