• 应用地球物理学Ⅰ（油气及金属矿产地球物理勘探） •

### 基于Bond变换的裂缝介质波场方位特征模拟及分析

1. 成都理工大学地球物理学院,成都 610059
• 收稿日期:2020-11-09 修回日期:2021-04-23 出版日期:2021-10-20 发布日期:2021-11-11
• 通讯作者: 阎建国 E-mail:lixb@stu.cdut.edu.cn;yanjianguo@cdut.edu.cn
• 作者简介:李小斌,男,1996年生,硕士,主要从事地震勘探、岩石物理等方面的研究. E-mail: lixb@stu.cdut.edu.cn
• 基金资助:
中国石油科技重大科技专项(2017E-0402)

### Seismic wavefield simulation and azimuth feature analysis for fractured media based on Bond transformation

LI XiaoBin(), YAN JianGuo*()

1. School of Geophysics,Chengdu University of Technology,Chengdu 610059,China
• Received:2020-11-09 Revised:2021-04-23 Online:2021-10-20 Published:2021-11-11
• Contact: YAN JianGuo E-mail:lixb@stu.cdut.edu.cn;yanjianguo@cdut.edu.cn

Abstract:

The seismic wavefield azimuth characteristics are significant in the study of seismic prediction methods for fractured oil and gas reservoirs. This paper constructs two sets of vertical fractured models with arbitrary angles, based on the linear sliding theory and Bond transformation to develop a generic fractured model. The azimuth characteristics are also considered in the two-dimensional wavefield simulation. According to the fundamental equations of elastic dynamics and Bond transformation, the elastic propagation velocity-stress equation with azimuth angle is derived and the high-precision staggered-grid finite difference method is used to simulate several fractured media. Thereafter, the wavefield characteristics of the models are analyzed. Simulation results reveal that for the models with two groups of vertical fractures having the same parameters and arbitrary angles, the wavefield characteristics exhibit minor change and the anisotropy strength is observed to be low in the fractured interior angle azimuth, whereas, the wavefield characteristics change drastically in the fractured exterior angle azimuth. When the fractures are orthogonal, similarly oriented wavefield characteristics are obtained. The influence of variations in the fracture parameters on the wavefield characteristics of the single group of fractured models is analyzed, and the three wavefield patterns are summarized. The wavefield characteristics of the fractured vertical plane are affected by the relative magnitudes of shear and normal weakness. From the fractured vertical to the fractured parallel planes, the wavefield changes towards a similar shape and is not affected by crack parameters. The results of this study further help to understand and apply the wavefield azimuth characteristics of the fractured media.