地震层析算法网格尺度适应性改进  

Improvement of the Adaptability to Grid Scale for Seismic Travel-time Tomography

作　　者：张小磊[1] 张东[1] 

机构地区：[1]武汉大学物理科学与技术学院,武汉430072

出　　处：《科技通报》2016年第10期25-30,共6页Bulletin of Science and Technology

基　　金：国家科技重大专项(2011ZX05003-003)

摘　　要：常规地震走时层析成像算法由于很少考虑网格尺度对反演结果的影响,容易导致计算结果受到网格尺度很大的制约,即只有在某一个特定的网格尺度之下,算法的计算结果才是比较可靠的。针对这一问题,本文提出了通过改进的插值算法、结合层内与层间处理的平滑算法、以及计算区域边缘递推算法,以提高算法的网格尺度适应性,使不同尺度之下的反演结果,都能够与实际情况相符,并使其变化规律保持一致。实验结果表明,该方法不仅提高了层析成像结果对网格尺度的的适应性,也提高了反演精度,使得结果更加符合实际的地质结构情况。The effect of grid scale on the inversion results was rarely considered in conventional seismic traveltime inversion algorithm, resulting in the calculation results was seriously restricted by grid scale,and the inversion results of conventional algorithm were more reliable only in a certain scale. In order to solve this problem, this paper proposed an improved method to improve the grid-scale adaptability of the algorithm and make the inversion results of different scales match with the actual situation, also keep the change rule consistent by the improving interpolation and smoothing algorithm and using recursive algorithm to correct the speed value of edge area. The numerical results showed that this method would not only improve the grid-scale adaptability of the tomography results, but also improve the accuracy of the inversion, in addition make the results more in line with the actual geological structure.

关 键 词：网格尺度适应性 插值 平滑 递推 

分 类 号：P631.4[天文地球—地质矿产勘探]