Abstract：A large mound shoal zone is developed on the east platform margin of the Deyang-Anyue rift trough, which is a favorable area for reservoir development. Plenty of intra-platform progradational reflection structures are found in the three-dimensional (3D) seismic data of the study area. The progradation is roughly distributed along the platform margin, which is different from the conventional progradation direction of carbonate platforms. These progradational reflection structures are less reported previously. Therefore, this study uses the 3D seismic data of the Moxi area and the calibration of drilling data to compare and trace the multi-stage progradational seismic reflection structures in the 3D area. Quantitative analysis helps to establish the filling sequence of the fourth member of the Dengying Formation in the deposition period, and the controlling effect of the Deyang-Anyue rift trough activity on deposition in this period is analyzed. The following conclusions are drawn:① The multi-stage progradation, mainly transverse progradation, occurs in the fourth member of the Dengying Formation, which is mainly controlled by the slow decline of the relative sea level in the highstand stage and continuously migrates along the platform-margin slope break. ② The progradational slope break and the development of algal-bound thrombolitic dolomite and algal-bound arenaceous dolomite on the continental side are favorable reservoir facies, which provide the material basis for high-quality reservoirs. ③ On the basis of intra-platform seismic reflection structures, the progradational slope break of each stage is identified, and the facies zones of reservoir rock development can be found. The superposition of the karst paleogeomorphology with these zones has the potential to reveal new gas enrichment areas. The proposed reservoir prediction method based on seismic reflection structures is of great reference significance for the exploration of other deep carbonate basins in China.
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