方位各向异性粘弹性介质波场数值模拟  

Wavefield numerical modeling in viscoelastic and azimuthally anisotropic media

作　　者：杜启振[1] 王延光[2] 余大祥[3] 

机构地区：[1]石油大学(华东)地球资源与信息学院 [2]胜利油田有限公司物探研究院 [3]胜利油田有限公司科技处

出　　处：《油气地球物理》2005年第1期27-31,共5页Petroleum Geophysics

基　　金：国家自然科学基金(40304008)资助项目。

摘　　要：当地震信号通过复杂地球介质时,地层除了表现为各向异性,还表现为内在的粘弹性特征。理想的地球介质模型应该能够模拟岩石的各向异性特征和衰减特征。本文给出了各向异性粘弹性介质模型的波动方程及其差分格式,并利用有限差分法实现了地震波波场数值模拟。结果表明了该介质模型中地震波场特征与各向异性主轴方位和介质的粘滞性参数之间的关系。When a seismic signal propagates through a complex medium , in addition to anisotropy, layers may show intrinsic viscoelastic behavior. Thus, an accurate description of wave propagation requires a rheology that accounts for the anisotropic and viscoelastic behavior of rocks. On the basis, the finite difference recursive formulae of viscoelastic and azimuthally anisotropic media are derived. Wavefield forward modeling with a finite difference method was carried out in viscoelastic and azimuthally anisotropic media. The numerical results from the method clearly shows that seismic wavefield is closely related with the viscoelasticity and the azimuth of the principal axes of anisotropy.

关 键 词：方位各向异性 粘弹性 介质波场 数值模拟 有限差分法 地震波 地震勘探 

分 类 号：P631.414[天文地球—地质矿产勘探]