弹性波波场分离数值模拟  

Numerical Simulation Method for Elastic Wave Field Separation

作　　者：陈祖银 王用军 彭达[3] 

机构地区：[1] 中海石油(中国)有限公司湛江分公司研究院 [2] 中海油能源发展特普地球物理研究所 [3] 西南石油大学资源与环境学院

出　　处：《中国石油勘探》2014年第6期47-53,共7页China Petroleum Exploration

基　　金：国家科技重大专项“南海北部深水区储集体地球物理描述和预测”(2011ZX05025-002-06)

摘　　要：波场分离是把全弹性波场分解成纯纵波和纯横波两部分,从而能更精确地研究纵波、横波在介质中的传播规律。采用分裂算子的方法构造等效的一阶双曲型弹性波动方程实现弹性波波场分离,以等能量震源和纵波震源作为激发震源项,并按高阶交错网格有限差分格式进行数值模拟。理论模拟试验表明,该方法能成功有效地从混合波场中分离出纵波和横波分量,并且稳定性好,精度高。这对研究弹性波传播规律、地震资料采集、处理及弹性波偏移成像等具有重要的意义。Wave field separation is to decompose hybrid wave field into pure compress wave and pure shear wave so that the propagation law of compress wave and shear wave in the medium can be studied more accurately. Operator separation is adopted to construct the first-order hyperbolic type elastic wave equation to achieve elastic wave field separation numerical modeling. In numerical process, equal energy source and longitudinal wave source are used as excitation source while the high-order staggered grid finite difference technique is used to simulate elastic wave equation. This method can successfully and effectively separates pure compress wave and pure shear wave from hybrid wave, with good stability and high accuracy. This study is of great significance to research on elastic wave propagation, seismic data acquisition and processing, and elastic wave migration imaging.

关 键 词：弹性波动方程 波场分离 数值模拟 高阶交错网格 

分 类 号：P631[天文地球—地质矿产勘探]