Abstract: Dongpu sag is a sophisticated oilfield which has been explored and developed for 30 years. At present, complex fault-block reservoirs are the major target for exploration and development, of which the fault blocks are small and cracked, the fault plane is steep, and oil column thickness is small. All the features require more accurate seismic exploration. To meet the requirements of exploration and exploitation, combined with the trends of geophysical technology, we shall learn from the relevant advanced techniques both at home and abroad and focus on high precision 3D seismic techniques to tackle the imaging problems in complex fault-block reservoirs. Finally, a series of techniques are developed to implement high precision 3D seismic exploration. The application of the techniques in the areas such as Machang and Qiaokou shows that they are effective in solving the exploration and development problems in complex fault-block areas, and are valuable to be more widely applied in the same problematic area.

Key words: high precision 3D seismics, rich hydrocarbon area, fine exploration, Dongpu sag, fault-block reservoir