For lithologic traps, only 2D surface seismic survey cannot confirm the favorable growth directions of reservoir; 3D surface seismic survey, however, has an extremely high cost; therefore, VSP is considered an effective method to study the formation variation around the well, especially in the area where the structure is relatively simple. In order to identify the favorable directions of the developed gas-bearing sands in the SDG structural belt, VSP surveys are carried out on PC1 well in this area. Through zero-offset P and S-wave VSP for normal incident survey, Walkaround and Walkaway VSPs for azimuth and offset variant survey as well as the data processing on the high-quality data acquired, the geophysical parameters of the target layer are extracted, and therefore, the dominant reservoirs and their spatial extensions are described, which has provided a basis for the further horizontal sidetrack drilling of the well. The result shows that VSP exploration can effectively predict the favorable growth directions of reservoirs. This has revealed the potential of VSP in this area.


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