各向异性介质共炮域高斯束叠前深度偏移

高斯束偏移作为一种射线类偏移方法的改进算法，兼顾了成像精度和运算效率，越来越受到人们的关注。在传统高斯束叠前成像算法的基础上，引入地下介质各向异性参数，通过修改运动学和动力学射线追踪方程，发展了基于各向异性介质的共炮域高斯束叠前深度偏移方法。简单各向异性洼陷模型和国际标准各向异性Hess模型的试算结果表明:各向异性参数对地震记录的大偏移距信息影响较大；对于地层各向异性不能忽略的探区，采用基于各向异性介质的高斯束成像方法能够更加准确地刻画复杂的地下构造。

As a kind of improved ray migration method,Gaussian beam migration method has got more and more attention with the advantages of high imaging precision and computation efficiency.Through modifying kinematic and dynamic ray tracing equations and introducing underground medium anisotropy parameters,we developed a prestack Gaussian beam depth migration method in common-shot domain for anisotropic media based on the algorithm of conventional Gaussian beam migration.Then we used simple anisotropic sub-sag model and the international standard anisotropic Hess model to verify the method and drew the conclusion that anisotropic parameters have a great influence on the large offset information of seismic data.Meanwhile for the exploration area where the stratum anisotropy can't be ignored,Gaussian beam migration method based on anisotropic media can be utilized to characterized the complex subsurface structures more accurately.