Because　the　seismic　wave　propagates　through　the　subsurface,　part　of　the　elastic　energy　eventually　ends　up　as　heat　energy.　This　phenomenon　is　known　as　absorption　(or　anelastic　attenuation).　The　factors　causing　anelastic　attenuation　include　fluid　movement　and　grain　boundary　friction.　The　seismic　quality　factor　(Q)　quantifies　the　anelastic　attenuation　and　is　commonly　used　in　assisting　reservoir　characterization.　However,　current　Q-estimation　approaches　are　mainly　implemented　on　a　poststack　seismic　volume.　The　Q-estimation　approaches　applied　to　poststack　seismic　data　assume　that　the　seismic　data　are　normal　incident　reflections,　and　they　do　not　consider　the　effect　of　the　travel　path　on　seismic　attenuation.　In　theory,　the　attenuation　degree　of　the　low-frequency　component　should　differ　from　the　attenuation　degree　of　the　high-frequency　component　for　large-offset　seismic　data.　We　have　developed　a　method　to　qualitatively　estimate　seismic　attenuation　in　the　prestack　seismic　domain.　A　continuous　wavelet　transform　is　used　to　extract　the　low-and　high-frequency　components　for　the　common-reflection　point　gathers.　The　difference　between　the　amplitude　of　the　low-frequency　component　and　the　amplitude　of　the　high-frequency　component　is　used　to　measure　the　seismic　attenuation　factor.　We　have　determined　the　effectiveness　of　our　method　by　applying　it　to　synthetic　and　real　seismic　data.