Optimal design of high precision observation system for secondary acquisition in the eastern sichuan region——a case study in the JN area

The JN area is located in the lithogenic syncline of the high and steep fold belt in east Sichuan Basin, The exploration potential of oil and gas resources is great, the first 3D seismic acquisition was carried out in 2007, due to the lack of pertinence of the early 3D acquisition scheme, There are some problems, such as small azimuth, low folds, large rolling line distance and serious acquisition footprints, it is difficult to meet the demand of exploration and development of target layer after repeated reprocessing of acquired data, in recent years, the observation system scheme of several blocks in the adjacent area have been optimized, the imaging effect of the data has been improved significantly, which strongly supports the exploration and evaluation of the target layer. In view of the acquisition difficulties of exploration and development in this work area, combined with the optimization design experience of observation system in neighboring areas, this paper demonstrates the key parameters of the observation system through the observation system design technology based on three-dimensional complex geological model, and puts forward an observation system scheme with small bin, wide azimuth and high fold that meets the exploration and development needs in this area. The feasibility of the observation system is demonstrated by comparing the amplitude and the coherence attribute of different object images, which provides theoretical guidance and basis for the optimization design of the 3D secondary acquisition high-precision seismic observation system in JN area.