菲涅耳体地震层析成像分辨率研究

摘要

The research on the resolution of seismic tomography can not only help us understand the ability of inversion, but also give instructions on setting of tomography parameters and optimization of seismic survey. We compare two previous methods calculating the seismic resolution of Fresnel volume tomography (FVT), and propose the corresponding optimization method. Through quantitative experiments on the synthetic data? some regularities about seismic resolution of FVT are summarized. Also, the resolutions of raypath tomography and FVT are compared. Finally, we give suggestions on seismic survey design and tomography, especially on parameters setting, including model partition and variable window size for smoothing in dynamic tomography.%层析成像分辨率的研究,不仅可以帮助分析层析方法的反演能力,评价层析反演的效果,还可以帮助指导层析参数设置,优化观测系统设计等.本文对比研究了前人提出的两种菲涅耳体层析成像分辨率的计算方法,并针对其存在的问题进行了优化.文中通过对二维理论模型的定量计算,总结了菲涅耳体地震层析成像分辨率的一些规律,并将其与射线层析的分辨率进行了对比.文中最后给出分辨率研究对观测系统与层析成像的指导作用,尤其是对层析中平滑窗设置、变网格层析中模型剖分原则给出了具体的建议.