密度和压缩系数的散射层析成像法

本文在速度成像的基础上研究了同时对密度和压缩系数成像的散射波层析成像法.对不同散射角度的计算可以得到一系列反演图像,拟合这些图像,从而可以有效地达到对密度和压缩系数（或速度）成像的目的.与单纯的速度成像相比,增加了反演的难度.首先是对资料的方位性要求增加;其次是对资料的利用率下降.即便如此,从对较少量的炮点和检波点资料的数值计算来看,仍取得了满意的成像结果.我们对组成字母“A”的散射体结构进行了成像计算,结果能够同时再现密度和压缩系数,成像清晰,表明了方法的可行性,并能应用于复杂结构的成像问题.

DIFFRACTION TOMOGRAPHY OF DENSITY AND BULK COMPLIANCE

In this paper the imaging of density and bulk compliance by diffraction tomography is being studied on the basis of velocity imaging. By inversion with such different angles, a series of inversion synthetic seismograms will be derived. To fit these seismograms, we can efficiently image density and bulk compliance (or velocity). Compared with pure velocity imaging, this algorithm is more complicated. First, more data of different directions are required; second, we can't make full use of those dafa. Even though a satisfied imaging result has been finally obtained through the computation of the data of tens of shots and receivers'. We inverted a model with several scatterers which formed a letter "A" and the density and the bulk com-phance have been reconstructed simultaneously. The distinct imaging results' show that this algorithm is feasible and can be applied to the imaging of complex structure.