关键词: 层析反演, 静校正, 复杂地表, 射线追踪, 西部地区

Abstract:

Static correction technique plays a key role in seismic data processing, especially in complicated surface. Static correction problem is serious in areas of western China with acute topographic undulation and sharp lateral variations of LVZ velocity. In complex near surface conditions, accurate near surface velocity models and static correction quantities cannot be acquired with conventional methods of field static correction and break first refraction static correction. Tomographic inversion static correction can obtain accurate near surface velocity models by tomographic inversion with nonlinear arithmetic, and figure out accurate static correction quantities. This paper introduces the basic theory and main steps of tomographic inversion static correction, including ray tracing and Simultaneous Iterative Reconstruction Technique inversion. Application result in the Bachu area of Tarim Basin shows that tomographic inversion static correction can clearly improve the effect of seismic stack imaging.

Key words: Tomographic inversion, Static correction, Complicated surface, Ray tracing, Western areas.