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Energies 2017, 10(9), 1393; https://doi.org/10.3390/en10091393

Sensitivity Analysis of Seismic Velocity and Attenuation Variations for Longmaxi Shale during Hydraulic Fracturing Testing in Laboratory

1
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2
Research Institute of Innovative Technology for the Earth (RITE), 9-2 Kizugawadai, Kizu-cho, Soraku-gun, Kyoto 619-0292, Japan
3
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, Higashi 1-1, Tsukuba City, Ibaraki 305-8567, Japan
*
Author to whom correspondence should be addressed.
Received: 31 July 2017 / Revised: 31 August 2017 / Accepted: 8 September 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Oil and Gas Engineering)
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Abstract

During the hydraulic fracturing procedure in shale-gas exploitation, the poroelastic properties of shale formation can be altered significantly. However, it is difficult to evaluate these variations using microseismic field data. In this study, we conduct a hydro-fracturing experiment using Longmaxi shale, which is a major formation for shale-gas production in China, to simulate the water injection and rock fracturing procedure. The variation of the velocity and attenuation for primary/secondary (P/S) ultrasonic waves was investigated throughout the entire experimental procedure. The results show that the attenuation is more sensitive to sample rupture than the velocity. However, P-wave attenuation loses sensitivity to the water injection after the fractures are saturated with water. In that case, it is preferable to use S-wave attenuation to identify the opening/closing of the fractures. Based on the experimental results, we can conclude that the variation of the attenuation must be considered during microseismic data processing and interpretation. View Full-Text
Keywords: velocity; velocity; attenuation; ultrasonic wave; triaxial compression; hydraulic fracturing; Longmaxi shale velocity; velocity; attenuation; ultrasonic wave; triaxial compression; hydraulic fracturing; Longmaxi shale
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Zhai, H.; Chang, X.; Wang, Y.; Xue, Z.; Lei, X.; Zhang, Y. Sensitivity Analysis of Seismic Velocity and Attenuation Variations for Longmaxi Shale during Hydraulic Fracturing Testing in Laboratory. Energies 2017, 10, 1393.

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