基于低降速带复杂地形的瑞雷波数值模拟研究  

Numerical Simulation of Rayleigh Wave Based on Complex Terrain in Low Velocity Zone

作　　者：王道远 王鑫 李勤 WANG Dao-yuan;WANG Xin;LI Qin(Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《河北地质大学学报》2021年第4期56-61,共6页Journal of Hebei Geo University

摘　　要：为研究地震勘探时瑞雷面波在近地表低降速带复杂地形中的特征规律,选取合理的稳定性条件,测试不同吸收层厚度,采取高阶交错网格有限差分算法进行数值模拟研究。通过对近地表低降速层介质模型的模拟,分析了瑞雷面波能量在地下低速层中的分布情况;通过对倾斜断层介质模型和垂直地质异常体介质模型的数值模拟,分析了地质勘探中近地表低降速带构造对波场的影响以及瑞雷面波的响应机理及传播规律,对实际地质勘探具有指导意义。In order to study the characteristics of Rayleigh surface wave in complex terrain of low velocity zone near the surface during seismic exploration,reasonable stability conditions are selected,different thickness of absorption layer is tested,and high-order staggered grid finite difference algorithm is adopted for numerical simulation.By simulating the medium model of the low speed down layer near the surface,the distribution of the Rayleigh surface wave energy in the low velocity layer is analyzed.Through the numerical simulation of the inclined fault medium model and the vertical geological anomaly medium model,the influence of the structure of the low speed zone on the wave field and the response mechanism and propagation law of the Rayleigh surface wave are analyzed,and the response mechanism and propagation law of the low speed zone on the actual geological exploration are analyzed,which has guiding significance.

关 键 词：瑞雷面波 低降速带 数值模拟 交错网格 

分 类 号：P631[天文地球—地质矿产勘探]