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Numeric Simulation of Acoustic-Logging of Cave Formations

Author

Listed:
  • Fanghui Xu

    (College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China)

  • Zhuwen Wang

    (College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China)

Abstract

The finite difference (FD) method of monopole source is used to simulate the response of full-wave acoustic-logging in cave formations. The effect of the cave in the formation of borehole full-waves was studied. The results show that the radius of cave is not only linearly related to the first arrival of the compressional wave (P-wave), but also to the energy of the shear wave (S-wave). The converted S (S–S wave) and P-waves (S–P wave) are formed when the S-wave encounters the cave. If the source distance is small, the S–S and S–P waves are not separated, and the attenuation of the S-wave is not large, due to superposition of the converted waves. The S–P wave has been separated from the S-wave when the source distance is large, so the attenuation of the S-wave increases. The amplitude of the P and S–waves changes most when the distance of the cave to the borehole wall reaches a certain value; this value is related to the excitation frequency. The amplitude of the Stoneley wave (ST wave) varies directly with the radius of cave. If the radius of the cave is large, the energy of ST wave is weak. The scattered wave is determined by the radius and position of the cave. The investigation depth of a monopole source is limited. When the distance of the cave to the borehole wall exceeds the maximum investigation depth, the borehole acoustic wave is little affected by the cave. In actual logging, the development of the cave can be evaluated by using the first arrival of the P-wave and the energy of the S and ST waves.

Suggested Citation

  • Fanghui Xu & Zhuwen Wang, 2020. "Numeric Simulation of Acoustic-Logging of Cave Formations," Energies, MDPI, vol. 13(15), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3908-:d:392499
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    References listed on IDEAS

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    1. Di Liu & Jianchun Fan & Shengnan Wu, 2018. "Acoustic Wave-Based Method of Locating Tubing Leakage for Offshore Gas Wells," Energies, MDPI, vol. 11(12), pages 1-21, December.
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