方向行波场的偏移成像方法  

Migration Imaging Method of Directional Traveling Wave Field

作　　者：刘鑫 LIU Xin(Basic Course Teaching and Research Department of Guangdong Polytechnic College,Zhaoqing,Guangdong 526100,China)

机构地区：[1]广东理工学院基础课教学研究部,广东肇庆526100

出　　处：《自动化应用》2024年第2期161-163,共3页Automation Application

基　　金：广东理工学院科研项目“二维声波和弹性波逆时偏移成像方法研究”(2022GKJZK009)。

摘　　要：弹性波快速成像方法一般是利用检波器波场中的反射P波和S波进行成像,在成像过程中,各方向的波场均参与成像,导致成像剖面产生干扰噪声,影响成像质量。为解决该问题,在检波器波场PS波成像方法的基础上改进,采用保幅的波场分离方法分离弹性波场,得到保幅的P波和S波,再分离沿不同方向传播的波场,利用改进的方向行波的转换波成像条件进行成像,在成像过程中,只利用传播方向相同的波场作互相关成像,避免其他传播方向的波场造成的影响。结果表明,该弹性波成像方法成像精度更高。The fast imaging method of elastic waves generally uses the reflected P and S waves in the detector wave field for imaging.During the imaging process,due to the participation of wave fields in all directions,interference noise is generated in the imaging profile,which affects the imaging quality.To solve this problem,an improvement was made on the PS wave imaging method of the detector wavefield.An amplitude preserving wavefield separation method was used to separate the elastic wavefield,obtaining amplitude preserving P-waves and S-waves.Then,the wavefields propagating in different directions were separated,and the improved converted wave imaging conditions for directional traveling waves were used for imaging.During the imaging process,only the wavefields with the same propagation direction were used for cross-correlation imaging,avoid the influence of wave fields in other propagation directions.The results indicate that the elastic wave imaging method has higher imaging accuracy.

关 键 词：弹性波 波场分离 方向行波 转换波 

分 类 号：P631.4[天文地球—地质矿产勘探]