Prestack Gaussian-beam depth migration
Prestack Gaussian-beam depth migration
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DOI：
10.1190/1.1487071
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发表时间：
2001-07-01
期刊：
影响因子：
3.3
通讯作者：
Hill, NR
中科院分区：
文献类型：
--
作者：
Hill, NR
克希霍夫偏移以其灵活性和高效性成为最常用的三维叠前深度偏移方法。然而，当复杂的速度结构导致地震能量的多路径时，它的有效性可能会受到限制。另一种方法是高斯波束偏移，它是基尔霍夫偏移的扩展，克服了多路径引起的许多问题。与只保留一个走时的初至波和最大能量波方法不同，该方法通过高斯波束的叠加保留了大部分波至。该方法是有效的，因为波束叠加的计算隔离的总和，不依赖于地震数据，并评估这些积分，通过考虑他们的鞍点。二维Marmousi测试数据集的高斯束偏移证明了该方法在地震能量多路径情况下构造成像的有效性。
Kirchhoff migration is the most popular method of three-dimensional prestack depth migration because of its flexibility and efficiency. Its effectiveness can become limited, however, when complex velocity structure causes multipathing of seismic energy. An alternative is Gaussian beam migration, which is an extension of Kirchhoff migration that overcomes many of the problems caused by multipathing. Unlike first-arrival and most-energetic-arrival methods, which retain only one traveltime, this alternative method retains most arrivals by the superposition of Gaussian beams.This paper presents a prestack Gaussian beam migration method that operates on common-offset gathers. The method is efficient because the computation of beam superposition isolates summations that do not depend on the seismic data and evaluates these integrals by considering their saddle points. Gaussian beam migration of the two-dimensional Marmousi test data set demonstrates the method's effectiveness for structural imaging in a case where there is multipathing of seismic energy.