中文摘要：

我们在场为双向波浪方程移植的有效降噪策略。三种主导的人工制品类型被一个优化成像条件分析并且消除。我们讨论以前未解决的像横梁的人工制品，它可能被引起由向下从来源和单个地震射击的接收装置方面播送并且向上散布波浪跨关联。这人工制品有相对强壮的 crosscorrelation，但是不从反射镜带有用信息。像横梁的人工制品广泛地存在在预先叠成像并且近似有象有用地震信号的一样的振幅。在大多数情况中，在图象的协调人工制品被方向性地宣传精力引起。基于 wavefield 坡度获得的繁殖角度，我们识别人工制品精力并且处于成像条件减去它的贡献。由这个过程，大多数人工制品能精确地被消除，包括直接波浪人工制品，散布人工制品，和 beamlike 人工制品。这个方法独立于 wavefield 增殖者并且如果需要，是容易的适应几乎所有当前的波浪方程迁居方法。当这个方法处理物理人工制品起源，很少损坏被引起到地震信号。过滤的额外的 k 域能另外提高叠的结果图象质量。这个方法在超级宽角度的单程的迁居成功并且我们能在另外的双向波浪方程迁居并且特别在反向的时间移植期望它的成功。

英文摘要：

We present an effective denoising strategy for two-way wave equation migration. Three dominant artifact types are analyzed and eliminated by an optimized imaging condition. We discuss a previously unsolved beam-like artifact, which is probably caused by the cross-correlation of downward transmitting and upward scattering waves from both the source and receiver side of a single seismic shot. This artifact has relatively strong cross- correlation but carries no useful information from reflectors. The beam-like artifact widely exists in pre-stack imaging and has approximately the same amplitude as useful seismic signals. In most cases, coherent artifacts in the image are caused by directionally propagating energy. Based on propagation angles obtained by wavefield gradients, we identify the artifact energy and subtract its contribution in the imaging condition. By this process most artifacts can be accurately eliminated, including direct wave artifacts, scattering artifacts, and beam- like artifacts. This method is independent of the wavefield propagator and is easy to adapt to almost all current wave equation migration methods if needed. As this method deals with the physical artifact origins, little damage is caused to the seismic signal. Extra k-domain filtering can additionally enhance the stacking result image quality. This method succeeds in the super-wide-angle one-way migration and we can expect its success in other two-way wave equation migrations and especially in reverse time migration.