1. College of Geoexploration Science and Technology��Jilin University��Changchun 130026��China; 2. BGP INC�� ��China National Petroleum Corporation��Zhuozhou 072751��Hebei��China

Multi-component seismic technique is a very potential method to explore lithologic reservoirs and explore stubtle reservoirs�� Because the real formation is viscoelastic medium��which causes the energy dissipation and waveform distortion��the S /N ratio and resolution of seismic data hardly to meet the requirements of oil and gas exploration�� In order to use the information of P- and S-waves better��the authors need to compensate both phase and amplitude of PP-and PS-waves�� A method to extract the S-wave Q value from common source gathers of prestack converted wave has been derived using analytical method�� The method extends the stable and efficient poststack inverse Q filtering algorithm to prestack inverse Q filtering for PP- and PS-waves��then improves the prestack inverse Q filtering algorithm to compensate for the seismic signals along the propagation path of PP-and PS-waves�� Finally��within the current constant Q layer��the authors decouple the amplitude operator which is travelling with PP-and converted PS-waves to the product of time and frequency�� The result of simulation shows that this algorithm obviously increases the efficiency of compensation on the premise of stability��