• 应用地球物理学 •

### 涪陵地区井下页岩岩芯裂缝体密度与声学性质关系实验研究

1. 1 中国科学院地理科学与资源研究所, 北京 100101;
2 中国科学院地质与地球物理研究所, 北京 100029;
3 中国科学院大学, 北京 100049
• 收稿日期:2016-01-04 修回日期:2016-09-08 出版日期:2016-10-05
• 通讯作者: 王伟,男,1972年生,助理研究员,从事地球物理方面研究.E-mail:wang_wei@lreis.ac.cn E-mail:wang_wei@lreis.ac.cn
• 作者简介:伍宇明,男,1989年生,在读博士,从事页岩气和灾害方面研究.E-mail:wuym@lreis.ac.cn
• 基金资助:
中国科学院战略性先导科技专项（B类）（XDB10030300）,国家自然科学基金（41525010、41204096和41374061）资助.

### The relationship between the volume density of cracks and acoustic properties of the shale core samples from Fulin

WU Yu-Ming1,3, LAN Heng-Xing1, GAO Xing1, WANG Wei1, CHEN Jun-Hui1,3, HAO Zhao-Bing2

1. 1 Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
• Received:2016-01-04 Revised:2016-09-08 Online:2016-10-05

Abstract: This article discusses the elastic wave velocity and frequency spectrum of the Longmaxi Shale from Fulin, Chongqing, China. The TAW-2000 Rock Tri-axial Testing System was applied on the core samples to produce fractures with different distributions. The distributions of fractures before and after the cracking test were obtained by X-CT. The volume density of cracks was obtained by computer pattern recognition. Accordingly, the relationship between the compression wave and the single-polarization shear wave in different angles with the crack and different distributions of cracks was investigated in a lab environment. The experimental results show that, the velocity of compression wave in fractured samples is slightly lower than that of original samples, except for the 150# sample. The waveforms of compression wave before and after the compression are similar, but the dominant frequency of the waveform of compression wave becomes lower after fracturing. The wave velocity of the shear wave varies with the azimuthal angle between the vibration direction and the fracture direction. The velocity reaches the highest and lowest values when the S-wave polarization is parallel and perpendicular to the strike direction of fracture, respectively. The velocity is moderate in diagonal directions. If the vibration direction is perpendicular to the fracture plane, the shear wave is opposite to the original direction. Specifically, before the compression, the dominant frequency of shear wave for typical samples decreases with the azimuthal angle, while after the compression, in contrast, the dominant frequency is crashed and many local peaks arise in the spectrum, especially at lower frequency band. The average velocity of shear wave decreases as the volume of density of cracks increases. In addition, the average wave velocity ratio between shear wave and compressional wave has a strong relationship with the volume density of cracks. Therefore, our experiments show that the shear wave is more sensitive to the fractures compared with the compressional wave, and indicate that shear wave exploration is more effective for detecting targets that have many fractures.

• P631
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