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Anisotropy measurements and characterization of the Qingshankou shale

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Abstract

Qingshankou shale (Gulong area, China) exhibits strong acoustic anisotropy characteristics, posing significant challenges to its exploration and development. In this study, the five full elastic constants and multipole response law of the Qingshankou shale were studied using experimental measurements. Analyses show that the anisotropy parameters ϵ and γ in the study region are greater than 0.4, whereas the anisotropy parameter δ is smaller, generally 0.1. Numerical simulations show that the longitudinal and transverse wave velocities of these strong anisotropic rocks vary significantly with inclination angle, and significant differences in group velocity and phase velocity are also present. Acoustic logging measures the group velocity in dipped boreholes; this differs from the phase velocity to some extent. As the dip angle increases, the longitudinal and SH wave velocities increase accordingly, while the qSV-wave velocity initially increases and then decreases, reaching its maximum value at a dip of approximately 40°. These results provide an effective guide for the correction and modeling of acoustic logging time differences in the region.

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Authors and Affiliations

  1. Daqing Oilfield Exploration Division, Daqing, Heilongjiang, 163000, China

    Qing-feng Li

  2. Daqing Branch Company of CNPC Logging, Daqing, Heilongjiang, 163000, China

    Xue-hong Yan

  3. Exploration and Development Research Institute of Daqing Oilfield Co., Ltd., Daqing, 163712, China

    Wei-lin Yan, Li Ren & Xue **a

  4. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Bei**g, 100190, China

    Peng Wang, Jian-qiang Han & Hao Chen

Authors
  1. Qing-feng Li
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  2. Xue-hong Yan
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  3. Wei-lin Yan
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  4. Li Ren
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  5. Peng Wang
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  6. Jian-qiang Han
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  7. Xue **a
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  8. Hao Chen
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Corresponding author

Correspondence to Hao Chen.

Additional information

This work was supported by Major Science and Technology Special Project of China National Petroleum Corporation “Research on Large scale Storage and Production Increase and Exploration and Development Technology of Continental Shale Oil” (2023ZZ15)

Chen Hao received the Ph.D. degree from the Institute of Acoustics, Chinese Academy of Sciences Bei**g, in 2007.

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Li, Qf., Yan, Xh., Yan, Wl. et al. Anisotropy measurements and characterization of the Qingshankou shale. Appl. Geophys. (2024). https://doi.org/10.1007/s11770-024-1102-y

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  • DOI: https://doi.org/10.1007/s11770-024-1102-y

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