Abstract: A set of uniform thickness models of layered absorption media were established. The absorption and attenuation character of stratum were calculated as well. Based on these results the mathematic model and spectrum equilibrating filter (SEF) frame were designed. Ricker wavelet whose predominant frequency is 200Hz was chosen as the exciting wave, and the character parameters (predominant amplitude，predominant frequency and frequency bandwidth) of its reflected wave were calculated. Filtered by SEF the strata’s absorption and attenuation was compensated and the parameters of reflected wave could be improved as well. When time range changed from 0.5s to 3.0s, the predominant amplitude, predominant frequency and frequency band increased 20.55-30.40 dB , 104-74 Hz and 205-186 Hz , respectively, and the resolution increased to 2.9-13.9 m(increasing 56%-67%).

Key words: strata’s absorption, seismic reflected wave, resolution, predominant amplitude, predominant frequency, frequency bandwidth, equilibrating filter, high frequency increasing