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Reconstruction of Hydraulic Fractures Using Passive Ultrasonic Travel-Time Tomography

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  • Wei Zhu

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Xu Chang

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China)

  • Yibo Wang

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China)

  • Hongyu Zhai

    (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China)

  • Zhenxing Yao

    (Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
    Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China)

Abstract

The knowledge of hydraulic fracture morphology is significant for the analysis of fracture mechanisms. This paper utilizes passive Ultrasonic Travel-time Tomography (UTT) to characterize the hydraulic fracture. We constructed a velocity model based on X-ray computerized tomography (X-CT) images scanned on a real hydraulically fractured shale column. Then, ray-paths and travel times corresponding to the source-receiver configuration were calculated by curved ray-tracing schemes. Lastly, we performed tomographic inversions using total variation regularization (TVR). The simulation results showed that 3D passive UTT based on TVR is an accurate, efficient, and stable method to reconstruct the velocity structures with fractures, even in the case of sparse ray-coverage or high noise level. Meanwhile, we also verified that the passive UTT is a valid alternative to X-CT in depicting the hydraulic fracturing rock via a proper interpretation method.

Suggested Citation

  • Wei Zhu & Xu Chang & Yibo Wang & Hongyu Zhai & Zhenxing Yao, 2018. "Reconstruction of Hydraulic Fractures Using Passive Ultrasonic Travel-Time Tomography," Energies, MDPI, vol. 11(5), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1321-:d:148386
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    References listed on IDEAS

    as
    1. Hongyu Zhai & Xu Chang & Yibo Wang & Ziqiu Xue & Xinglin Lei & Yi Zhang, 2017. "Sensitivity Analysis of Seismic Velocity and Attenuation Variations for Longmaxi Shale during Hydraulic Fracturing Testing in Laboratory," Energies, MDPI, vol. 10(9), pages 1-16, September.
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    Cited by:

    1. Yi Feng & Gao Li & Yingfeng Meng & Boyun Guo, 2018. "A Novel Approach to Investigating Transport of Lost Circulation Materials in Rough Fracture," Energies, MDPI, vol. 11(10), pages 1-19, September.
    2. Seyedalireza Khatibi & Mehdi Ostadhassan & David Tuschel & Thomas Gentzis & Humberto Carvajal-Ortiz, 2018. "Evaluating Molecular Evolution of Kerogen by Raman Spectroscopy: Correlation with Optical Microscopy and Rock-Eval Pyrolysis," Energies, MDPI, vol. 11(6), pages 1-19, May.

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