各向异性介质弹性波场成像的Thomsen参数影响研究与分析

Research and analysis of Thomsen parameters influence of elastic wave field imaging in anisotropic media

基于各向同性介质假设条件的常规地震处理与反演方法已不能满足现今对高精度、微细构造勘探的要求。因此,加深对各向异性介质的研究,了解影响介质各向异性程度的各种因素的特点可以为基于各向异性介质的地震处理与反演提供有利的参考。以表征介质各向异性程度的Thomsen参数作为研究的出发点,分析各参数对地震波场的运动学和动力学特征的影响,了解在各向异性参数变化时弹性波场的响应情况,并对层状横向各向同性介质的地震正演记录与各向异性参数间的关系进行了分析与研究。通过以上数值模拟研究,可进一步加深对影响介质各向异性程度的各种参数的认识,为介质的各向异性参数反演和分析提供有力依据。

Normal seismic processing and inversing based on supposed isotropy cannot satisfy the requirement of microstructure exploration with high precision. So it will provide a favorable reference for seismic processing and inversing to do more research on anisotropy media and to find out the characters of factors that influence the anisotropic degree of media. This paper starts with the research of Thomsen parameters that characterized the degree of anisotropic media, an- alyze the influence of every parameter on characters of dynamics and kinematics of seismic field, and find out the response of the field while the parameters change. We also make research on the relationship between parameters and seismic record. Through the research above, we will take a good knowledge of parameters that affect the media＇s anisotropy, thus to provide a powerful sustain for the anisotropic parameters inverse and analyses.