Finite-difference modeling experiments for seismic interferometry
Finite-difference modeling experiments for seismic interferometry
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DOI：
10.1190/geo2010-0039.1
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发表时间：
2011-12
期刊：
影响因子：
3.3
通讯作者：
J. Thorbecke;D. Draganov
中科院分区：
文献类型：
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作者：
J. Thorbecke;D. Draganov
在被动地震干涉测量中，通过对记录的噪声数据进行互相关可以获取新的反射数据。所获取反射数据的质量除其他因素外，取决于记录时间内存在的被动震源的持续时间和数量、震源分布以及震源强度。为了研究这些关系，我们开展了若干数值模拟研究。为了在可行的时间内进行模拟，我们设计了一种有限差分算法，用于模拟地下带限噪声特征的长时间被动地震测量。该算法的新特点包括在一次模拟运行中对数千个随机放置的震源进行建模。模拟实验探究了所获取的反射与震源特征长度、震源位置、震源数量以及震源振幅变化之间的依赖关系。从这些实验中我们观察到，被动震源的位置和震源信号的长度对所获取反射的质量有直接影响。震源信号之间的随机振幅变化似乎对所获取的反射没有很大影响。
In passive seismic interferometry, new reflection data can be retrieved by crosscorrelating recorded noise data. The quality of the retrieved reflection data is, among others, dependent on the duration and number of passive sources present during the recording time, the source distribution, and the source strength. To investigate these relations we set up several numerical modeling studies. To carry out the modeling in a feasible time, we design a finite-difference algorithm for the simulation of long-duration passive seismic measurements of band-limited noise signatures in the subsurface. Novel features of the algorithm include the modeling of thousands of randomly placed sources during one modeling run. The modeling experiments explore the dependency relation between the retrieved reflections and source-signature length, source positions, number of sources, and source amplitude variations. From these experiments we observed that the positions of the passive sources and the length of the source signals are of direct influence on the quality of the retrieved reflections. Random amplitude variations among source signals do not seem to have a big impact on the retrieved reflections.