Interferometric imaging condition for wave-equation migration
Interferometric imaging condition for wave-equation migration
复制标题
DOI：
10.1190/1.2838043
复制
发表时间：
2008-03
期刊：
影响因子：
3.3
通讯作者：
P. Sava;O. Poliannikov
中科院分区：
文献类型：
--
作者：
P. Sava;O. Poliannikov
深度地震成像的保真度取决于用于波场重建的速度模型的精度。模型可以分解为两个部分，分别对应于大尺度和小尺度变化。在实际应用中，使用重复偏移/层析成像循环可以对大尺度速度模型分量进行高精度估计，但对小尺度分量则不能。当地球有明显的小尺度速度分量时，波场重建不能完全描述记录数据，并且偏移图像会受到伪影的干扰。有两种可能的方法来解决这个问题：(1)通过使用常规技术（例如波场相互关系）估计更精确的速度模型和图像来改进波场重建；(2)使用已知的背景速度模型使用常规方法重建波场，但改善成像条件以减轻不精确重建造成的伪影。我们描述了……的未知成分。
The fidelity of depth seismic imaging depends on the accuracy of the velocity models used for wavefield reconstruction. Models can be decomposed in two components, corresponding to large-scale and small-scale variations. In practice, the large-scale velocity model component can be estimated with high accuracy using repeated migration/tomography cycles, but the small-scale component cannot. When the earth has significant small-scale velocity components, wavefield reconstruction does not completely describe the recorded data, and migrated images are perturbed by artifacts. There are two possible ways to address this problem: (1) improve wavefield reconstruction by estimating more accurate velocity models and image using conventional techniques (e.g., wavefield crosscorrelation) or (2) reconstruct wavefields with conventional methods using the known background velocity model but improve the imaging condition to alleviate the artifacts caused by the imprecise reconstruction. Wedescribe the unknown component o...