Imaging And Coherency In Complex Structures
Imaging And Coherency In Complex Structures
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DOI：
10.1190/1.1826642
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
C. Nolan;W. Symes
中科院分区：
文献类型：
--
作者：
C. Nolan;W. Symes
在复杂的结构中，可能有一对以上的射线通过散射点连接源和接收器。当存在许多这样的射线对并且具有相同的双向走时时，在逆散射过程中出现固有的模糊性。除非满足简单的射线几何条件，否则迁移部分将包含不需要属于实际反射率场的图像。几何要求与采集几何有关，并且当源和接收器都覆盖一个区域时，几乎总是满足几何要求。即使满足采集几何结构的几何要求，但对于单源实验（不同采集几何结构）可能并非如此，因此相干面板可能不是平坦的，即使以精确的背景速度迁移。
In complex structures, more than one pair of rays may connect a source and receiver via a scattering point. Whenever many such pairs of rays exist and have the same two-way traveltime, an inherent ambiguity appears in the inverse scattering process. Unless a simple ray geometric condition is met, the migrated section will contain images that need not belong to the actual reflectivity field. The geometric requirement relates to the acquisition geometry, and it is almost always satisfied when the sources and receivers both cover an area. Even if the geometric requirment is satisfied for the acquisition geometry, it may not be so for single source experiments (different acquisition geometry) consequently coherency panels may not be flat, even if one migrates with the exact background velocity.