叠前时间偏移技术在肇源南地区的应用

当地层倾角较小构造相对不很复杂时,基于零炮检距剖面的叠后时间偏移能获得较满意的偏移效果,但当地层倾角较大构造复杂时,NMO校正叠加剖面不等同于零炮检距剖面,因此,需要采用叠前时间偏移处理技术。介绍了三维叠前时间偏移方法的基本原理、实现过程及该方法在大庆肇源南地区的应用效果。通过不同偏移方法的剖面对比说明,采用叠前时间偏移方法,剖面的断面清晰,断点清楚,地层接触关系清晰,陡倾角构造的成像明显好于叠后时间偏移。

The Application of Pre-stack Time Migration Technology in Zhaoyannan Area

When the dips of strata are small and structures are not very complex comparatively, post-stack time migration on the basis of zero-offset section can obtain satisfactory migration results; whereas the dips of strata are big and structures are very complex, the stack sections with NMO correction are not equal to zero-offset sections. Therefore, we need to use pre-stack time migration processing technology. The thesis discusses the basic principles and performing procedures of the 3D pre-stack time migration, and the application results of the method using in the Zhaoyuannan Block. Comparing with different sections generated from adopting different migration methods illustrates that using the pre-stack time migration method is distinctly better than using post-stack time migration in imaging complex structures with steep dip, and the fault plane reflection is clearer, fault points are distinct, the contacting relations of the strata are explicit.