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
Corresponding AuthorWang Wei(wang_wei@lreis.ac.cn)
AbstractThis 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.
KeywordShales Ultrasonic wave Volume density of cracks CT scan
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000388654300032
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang Wei
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wu Yu-Ming,Lan Heng-Xing,Gao Xing,et al. The relationship between the volume density of cracks and acoustic properties of the shale core samples from Fulin[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(10):3891-3900.
APA Wu Yu-Ming,Lan Heng-Xing,Gao Xing,Wang Wei,Chen Jun-Hui,&Hao Zhao-Bing.(2016).The relationship between the volume density of cracks and acoustic properties of the shale core samples from Fulin.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(10),3891-3900.
MLA Wu Yu-Ming,et al."The relationship between the volume density of cracks and acoustic properties of the shale core samples from Fulin".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.10(2016):3891-3900.
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