The high frequency of seismic waves will attenuate quickly when the porous reservoir is permeated by gas (P wave attenuates at great speed in the gas medium). Accordingly, the attenuation regularities of the high frequency of traveling seismic can be used for gas reservoirs detection. To get exact seismic information,seismic data should be processed to get high resolution, high S/N and high fidelity. Based on the processed seismic data, we apply the wavelet based energy absorbing analysis to calculate time varying space varying wavelets, and then calculate the vertical distribution of the energy attenuation of instantaneous wavelets, according to which the noise will be eliminated. Finally, the absorption abnormity of the gas reservoir can be analyzed with accuracy using the post stack data. The dominating oil and gas strata in the Shanle area is joined to special strata vertically, the E shreservoir is glutenite and there are several coal layers under J₂x². Both strata appear as strong absorption in the absorption section ofinstantaneous wavelets. The strong absorption caused by theoil and gas bearing strata is mixed with that by special strata, but the oil andgas strata can berecognized by their differences. The strong absorption of the gas bearing part ofE_shshifts upwards in time direction, resulting in its higher position than the event of the glutinite strata. The strong absorption of J₂x² is weaker than that of coal layer, showing the existence of oil and gas.