无上下分解的Marchenko成像的格林函数表示
Green's function representations for Marchenko imaging without up/down decomposition
摘要：
Marchenko方法基于积分表示，其根据表面处的反射响应来表达地下中的虚拟源和/或接收器的格林函数。一个基本的假设是，在介质内部，波场可以分解为下行波和上行波，并且可以忽略倏逝波。我们提出了一个新的推导格林函数表示绕过这些假设，无论是声学和弹性动力学的情况。这些表示形式的基础上，研究新的马尔琴科方法，有可能处理折射波和倏逝波，更准确地成像陡峭倾斜的反射器。
英文摘要：
Marchenko methods are based on integral representations which express Green's functions for virtual sources and/or receivers in the subsurface in terms of the reflection response at the surface. An underlying assumption is that inside the medium the wave field can be decomposed into downgoing and upgoing waves and that evanescent waves can be neglected. We present a new derivation of Green's function representations which circumvents these assumptions, both for the acoustic and the elastodynamic situation. These representations form the basis for research into new Marchenko methods which have the potential to handle refracted and evanescent waves and to more accurately image steeply dipping reflectors.
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