The Research of Seismic Elastic Wave Reverse-time Migration Imaging Based on Tunnel Space
This paper provides a full 2-D elastic reverse time migration algorithm to predict unfavorable geological structures in front of the tunnel face in advance,in which we start from 2D velocity-stress equation and then use P wave and S wave decoupling staggered grid reverse time migration operator without converted wave and exciting time imaging condition.The migration of geological models shows ①Using pre-stack reverse time migration,we can obtain great migration images of the geological tunnel-based models,②When considering a vertical (the angle between interface and tunnel face) geological interface or a cave model,sidewall system with shots on the tunnel face contributes to migration imaging.③ In sidewall system,with the decreasing of the dip of geology interface,the energy of P wave migration increases while the energy of S wave migration decreases.Large dip contributes to S wave migration while small dip contributes to P wave migration.
pre-stack reverse time migration tunnel advance prediction observation system
Liu Jiangping Qu Niannian Cheng Fei Tang Weiyu
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan, Hubei, 430074, China Geological Survey of Guizhou Procince, Guiyang, Guizhou, 550018, China
国际会议
长沙
英文
234-239
2012-06-15（万方平台首次上网日期，不代表论文的发表时间）