摘要
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。
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.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2005年第S2期71-73,7,共4页
Journal of Oil and Gas Technology
关键词
肇源南地区
时间域预处理
偏移速度
叠前时间偏移
Zhaoyuannan area
pre-processing in time domain
migration velocity
pre-stack time migration
