Abstract：Compared with conventional stacking data,pure P-wave seismic data can provide information from an approximate zero incident angle,so that AVO effect can be eliminated,and amplitude distortion caused by multiple stacking can be avoided. Furthermore,pure P-wave seismic data can reduce the effect caused by NMO stretching,restore seismic resolution,and reflect real sedimentary phenomena. Taking the Dn4 member in the Gaoshiti area,the central Sichuan Basin as a case,we chose pure P-wave from the seismic data to study the Dn4 sub-member reservoir. The results show the pure P-wave data can:①correctly reflect the impe-dance contrast between the reservoir and the caprock; ②describe the geological phenomena of bi-directional overlapping in the Qiongzhusi Formation,and accurately divide the high and low acoustic velocity in the cap-rock and identify the underlying reservoir;③describe the boundary between the upper and lower Dn4 sub-members,and the lithologic difference between the transgressive system tract and the high water system tract,and the thinning bio-flat sediments of the upper Dn4 sub-member from the margin to center of the platform. These results provide new ideas for wells deployment in the Gaoshiti area.
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