地震层析成像的理论研究及其在岩溶发育区的应用  

Theoretical Study of Seismic Tomography and Its Application in the Karst Development Area

作　　者：谭显江 付小明 丁亮清 余志奇 刘涛 

机构地区：[1]长江工程地球物理勘测武汉有限公司,武汉430014 [2]武汉市政工程设计研究院有限责任公司,武汉430015

出　　处：《南水北调与水利科技》2013年第3期177-179,188,共4页South-to-North Water Transfers and Water Science & Technology

摘　　要：基于均匀介质中的波射线传播理论,应用直射线追踪方法进行射线走时正演计算,建立了速度模型。对模型分别进行SIRT算法和LSQR算法反演,对比分析后发现,LSQR算法在精度、效率和稳定性三个方面都能达到较好的平衡。以溶洞发育区某水电站右岸部分平硐勘探为实例,利用地震层析成像法准确探明了岩体速度分布情况和区内K25溶洞的空间分布位置,通过与其它方法结果的对比验证,表明地震层析成像法对于溶洞发育区具有分辨率高、图像直观、易于解释等优点。Based on the wave ray propagation theory in the homogeneous medium, a velocity model was developed for the for- ward calculation of ray using the straight ray tracking method. The model was simulated inversely using the SIRT and LSQR al- gorithms. The results showed that LSQR algorithm can achieve a better balance in the accuracy, efficiency, and stability. The seismic tomography method was applied to the adit exploration on the right bank of a hydropower station in the karst develop- ment area. This method can determine the velocity distribution of the rock mass and the spatial distribution of K25 cave in the area. Compared with the results obtained from other methods, it suggested that the seismic tomography method has the advanta- ges of high resolution,intuitive image,and easy to explain when used for the karst development area.

关 键 词：地震层析成像 SIRT算法 LSQR算法 溶洞发育区 

分 类 号：P631[天文地球—地质矿产勘探]