论文部分内容阅读
近似反演投影AIM(Approximate Inverse Mapping)方法,是D.W.Ordenburg和R.G.Ellis在1991年提出的。它可以不要求反演算子和正演算子同时精确,而通过在数据空间和模型空间里做一些简单修正计算来达到较好的反演效果。在地震走时CT反演中,射线追踪常用最短路径追踪方法,该方法的计算非常耗时。本文给出了应用AIM进行基于最短路径追踪的走时CT反演算法,而基于AIM-DS的算法可以大大提高反演速度,而反演精度只略微降低。在实际工作中,适合于资料的初步解释和最短路径追踪无法完成(如数据量过大)的情况。
The Approximate Inverse Mapping (AIM) Approximate Inverse Mapping method was proposed by D. W. Ordenburg and R. G. Elisis in 1991. It does not require both the inversion operator and the forward operator to be accurate at the same time. However, it can achieve better inversion results by doing some simple correction calculations in data space and model space. In the CT inversion of seismic traveltimes, the ray tracing method is usually used to track the shortest path. The calculation of this method is very time-consuming. This paper presents a walk-ahead CT inversion algorithm based on the shortest path tracking using AIM, while the AIM-DS based algorithm can greatly improve the inversion speed, while the inversion accuracy is only slightly reduced. In practical work, suitable for initial interpretation of data and shortest path tracking can not be completed (such as the amount of data is too large) situation.