基于特征波属性参数的立体层析速度反演方法研究  

Velocity inversion using stereo-tomography based on attributes of eigen-wave

作　　者：洪瑛[1] 韩文功 孙小东[1] 李振春[1] 李芳[1] 

机构地区：[1]中国石油大学(华东),青岛266580 [2]中石化石油工程地球物理有限公司,北京100010

出　　处：《物探化探计算技术》2017年第3期359-366,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然基金(41104069;41274117)

摘　　要：研究了利用法向入射点波(NIP波)的运动学属性,实现立体层析速度反演的方法。对这些运动学参数做层析反演,以得到用于深度域偏移成像的横向非均质平滑速度模型。多次迭代过程中,沿法向射线进行动力学射线追踪获得正演参数,且拾取的参数和正演参数误差达到最小,进而得到最佳速度模型。在正演模拟过程中,利用射线扰动理论计算出Frechet导数,使得目标函数梯度最小化。该方法拾取方便、易于实现,尤其适用于低信噪比的地区。将该方法应用于二维模型数据,收到了预期的效果。In this paper investigation is conducted to implement stereo-tomography using kinematic attributes of eigen - wave which is so called normal incidence point （NIP） wave. These kinematic parameters are utilized in tomography to achieve smooth and lateral homogenous velocity model which can be applied to migration in depth domain. Multiple iteration are carried out to minimize the picked parameters and simulated ones through which optimal velocity model can be derived. During itera-tion, simulated parameters are obtained from dynamic ray tracing. Subsequently Frechet derivatives of tomography matrix are calculated via ray perturbation theory to minimize the objective function. This method is facilitated to operate with the advan-tage of convenient picking particularly applicable to low S/N ratio area. In this paper 2D model test shows expected and promis-ing results using this approach.

关 键 词：特征波 立体层析反演 动力学射线追踪 射线扰动理论 

分 类 号：P631.4[天文地球—地质矿产勘探]