层析反演静校正方法在西部复杂地区的应用

静校正技术在复杂地表区地震资料处理中至关重要。在中国西部地区，地表起伏剧烈，表层低速带横向速度变化较大，静校正问题严重。传统的野外静校正和初至折射静校正方法在复杂近地表条件下很难求准近地表速度模型和静校正量。层析反演静校正方法通过非线性算法反演出准确的近地表速度模型，求出准确的静校正量。给出了层析反演静校正方法的基本原理和实现过程，包括射线追踪和联立迭代重构法反演。通过在塔里木盆地巴楚地区的实际应用，明显改善了地震叠加成像效果.

Application of Tomographic Inversion Static Correction in Complex Areas of Western China

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.