Title

One-way wave method for seismic wave field simulation for complex medium

单位

1.中国石油勘探开发研究院，北京100083；2.中国科学院地质与地球物理研究所，北京100029；3.中国石油天然气集团公司川庆钻探工程有限公司工程技术研究院，陕西西安710018

Organization

Petroleum Exploration and Production Research Institute,CNPC,Beijing 100083,China

摘要

单程波方法是常用的地震正演模拟方法之一。与双程波方法相比，单程波方法的计算量成倍减少，且能保持较高的精度。但由于单程波方法不能获得准确的入射角信息，因而多采用垂直入射的反射系数，使得模拟波场的振幅特征不是实际地层的真实反映。为此，提出了结合频率-波数域反射系数近似公式和相移加插值的改进单程波方法。分别采用双程波虚谱法、常规单程波方法和改进单程波方法，基于Marmousi模型进行了数值模拟，对比模拟结果发现，改进的单程波方法可以准确地模拟振幅随入射角的变化，且具备与双程波方法相同的精度。

Abstract

The one-way wave method is commonly used for simulating seismic wave,compares with the two-way wave simulation method,the computation of one-way method becomes time of reduction,also maintains higher precision,but the one-way wave method is unable to obtain the accurate incidence angle information,thus the normal incidence reflectivity is used,but the amplitude characteristics of simulated wave field is not the real reflection of actual formations.Therefore,we proposed an improved one-way wave method by combining reflectivity approximate formula in frequency-wave number domain and phase-shift plus interpolation method.Two-way wave pseudo spectral method,conventional one-way wave method and the improved one-way wave method were separately adopted to simulate single shot recorder based on Marmousi model.Comparison on simulated results show that the improved one-way wave method can accurately simulate the changes of amplitude via incident angle and has the same precision with two-way wave method.

关键词：

地震波正演模拟; 波动方程; 单程波; 相移加插值; 反射系数随入射角变化;

Keywords:

forward simulating on seismic wave; wave equation; one-way wave; phase shift plus interpolation; reflectivity via incident angle;

基金项目

DOI

复杂介质地震波场模拟的单程波方法