Abstract：Zhujiang Formation reservoir in structure of Baiyun deep-water area of Pearl River Mouth Basin is a slope gravity flow channel-lobe complex deposition, which has great exploration potential. The reservoir distribution and trap conditions in this structure are the main problems to be solved. As calcareous sandstone is gene-rally developed above the sandstone L of the Zhujiang Formation in this area, the trough at the top interface of the sandstone features continuous reflection, and it is difficult to predict deep-water fan reservoirs and identify litho-logic traps. In view of these problems, this paper comprehensively analyzes the seismic response characteristics of Zhujiang Formation reservoir via seismic forward modeling and proves that the continuous reflection of the trough is affected by the calcareous sandstone, and the lower peak is the real reflection of the reservoir. In addition, it is found that the existence of calcareous sandstone changes the variation law of AVO curves of gas-bearing sandstone, which thus reduces the lithology identification ability of VP/V/S (P_and S_wave velocity ratio). Based on the P-wave impedance (IP) and VP/V/S results obtained by pre-stack inversion, the paper constructs a new lithologic indicator and realizes the accurate identification of deep-water fan sand bodies of Zhujiang Formation, which thus lays a solid foundation for lithologic trap evaluation. The application results show that the proposed method can effectively improve the lithology identification ability and lithology boundary description effect in the study area.The prediction results are consistent with the drilling data, which provides a reliable basis for subsequent exploratory well deployment in the area.
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