Abstract：The channel sandstone of Shaximiao Formation in Qiulin area of the central Sichuan Basin has the geological characteristics of multiple stages and superimposed sand bodies. The fine description of sand bodies and their superimposed relationships plays a crucial role in the deployment of horizontal wells. Since the conventional seismic exploration method is difficult to obtain the ideal effect，the multi-component seismic exploration has been carried out in the study area. The results show that：① The P wave velocity of sandstone and mudstone in Shaximiao Formation is basically the same，while the S wave velocity is highly different，so the converted wave has a great advantage in distinguishing lithology. ② The P wave data are not sensitive to the change of sand bodies，and the seismic waveform cannot reflect the superimposed relationship of sand bodies. Although the main frequency of the converted wave is lower than that of the P wave，it is sensitive to the change of lithology，and the seismic waveform has a good correspondence with the change of sand bodies. ③ The S wave velocity accuracy by the P wave pre-stack inversion is low，while the S wave velocity by joint PP-PS wave inversion has high prediction accuracy，which can accurately characterize the sand body and its superimposed relationship. The study shows that multi-component seismic technology has the potential to accurately describe sandstone reservoirs，which provides a data basis for accurate and efficient development of tight sandstone gas reservoirs in Shaximiao Formation.
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