| Normal post-stack seismic processing technologies have taken a leading role in exploration and development of many oil fields all over the world. However, post-stack migration cannot meet the ever-increasing needs of fine structure imaging and reservoir description, because of more and more difficulties and costs in oil exploration and development. Pre-stack time migration is one of seismic pre-stack imaging methods, which can not only solve the problems of blurring common reflection points, uncertain stack in complex structures with sharp dips and incorrect imaging with the combination of DMO and post-stack migration, but also provide common imaging gathers with better amplitude-preserving adaptable to AVO/AVA lithologic analysis and inversion. Compared to pre-stack depth migration, pre-stack time migration also has advantages of lower cost, shorter processing periods, easier realization and lower influence by man-made factors of geologic knowledge. With the wide application of computer and pc-cluster of high performance, pre-stack time migration has been becoming an indispensable flow in pre-stack imaging processing and a normal processing technique substitute for post-stack migration in prospecting domain of petroleum industry. In this paper,In this paper, various application methods of pre-stack time migration and correlative processing techniques knowing from conventional methods based on simple theoretical models are put forward to be really used in real data processing with strong practicability and developmental potential. integrating method with high practicability and correlative processing technologies, realizing better imaging of structure and amplitude-preserving for high precision seismic property prediction and inversion. There are two aspects of researching production and technical innovation in this paper.First, in order to solve realistic problems in pre-stack migration application. Based on the real aspects in 3D land exploration, the relationship of pre-stack migration and acquisition is analyzed .this paper is pointed out that ideal pre-stack migration not only calls for high S/N ratio of seismic data, but also needs uniform folds, offset interval, azimuth and illumination for subsurface volume. new principles for pre-stack time migration data acquisition is pre-stack time migration fold spectrum.Second, integrating method of pre-stack time migration can't obtained ideal results in land data sometimes. The results are affected largely by raw data quality. In combination with 3D pre-stack time migration in BS area, this paper puts forwards pre-stack gather processing techniques and procedure of integrating method. Compared with post-stack migration, pre-stack time migration profiles have improved highly and are fit for geologic interpretation. |
