南海神狐海域天然气水合物叠后逆时偏移处理及效果

Natural gas hydrates post-stack reverse-time migration processing and effects in Shenhu area of South China Sea

应用不同的偏移方法对Marmousi速度模型进行了偏移实验,实验结果表明,叠后逆时深度偏移成像清晰,对于复杂构造.尤其是丘体内部构造刻画准确,成像效果优于所比较的其他方法.与传统的偏移方法相比,叠后逆时偏移精度相对较高、无倾角限制,能很好地适应强横向速度变化.对南海神狐海域天然气水合物调查的一条二维测线应用了叠后逆时偏移,偏移效果甚至优于单程波波动方程的叠前深度偏移.因此,天然气水合物地震资料处理中,叠后逆时偏移应是一种值得重视的偏移方法.

Using a variety of methods for Marmousi migration experiment. The results show that post-stack reverse-time migration, to complex structure, especially the internal structure of salt, images clarity, accurate, and deep imaging of structure are more effective than other methods employed here. Compared with conventional migration method, the post-stack reverse-time migration is more accurate, no dip limitation, more adaptive to lateral velocity variation. Applying the post- stack reverse-time migration to a line on Shenhu Area of South China Sea, the image is better than that obtained from one-way wave equation pre-stack depth migration. Thus, post-stack reverse-time migration should be given more eyes in gas hydrate data processing.