Application of scattered wave velocity analysss in broken formation zone of the southern part, North China Basin
Gou Limin1, Liu Xuewei1, Liu Xi-ning2, Kong Jianbing2, Li Jianqi2
1. China University of Geosciences (Beijing), Beijing 100083, China;
2. Geophysics Institute, Henan Oiltield Branch Co., Sinopec, Nanyang, Henan 473132, China
Abstract：Seismic imaging in the southern part, North China Basin faces a few difficulties such as complex faults, steep-dipping broken formations, compii-cated wave tields, target inaccurate velocity and poor imaging.To solve these problems, we introduce in this paper a scattered wave velocity analysis method for pre-stack time migration velocity tield based on the scattering principle.We also demonstrate its implementation procedures and application results in a broken formations zone.The analysis shows that common scattered point (CSP) gathers have significant advantages.The fold of CSP gathers is much higher than that of common mid-point (CMP) gathers, as well as the traveltime curve of scattered wave in CSP gathers is hyperbola, whose apex directs real scattered points, which makes t possible to extract accurately the velocity of scattered wave.It is clear that the quality of scattered wave velocity spectrum is much better than that of traditional velocity spectrum.The application results indicate that the scattered wave velocity analysis method could be used to build accurate migration velocity models and improve imaging of steep-dipping broken formations.
勾丽敏, 刘学伟, 刘西宁, 孔剑冰, 李建齐. 散射波速度分析方法在南华北盆地破碎地层发育区的应用[J]. 石油地球物理勘探, 2012, 47(6): 873-881.
Gou Limin, Liu Xuewei, Liu Xi-ning, Kong Jianbing, Li Jianqi. Application of scattered wave velocity analysss in broken formation zone of the southern part, North China Basin. OGP, 2012, 47(6): 873-881.
