Abstract
A coal seam is thin compared to the wavelength of seismic waves and usually shows strong anisotropy. It may form special geological formations, such as goafs and collapses, in coal mines. The existence of these formations may lead to instability in numerical simulations of the goaf area in a coal seam. The calculation speed of simulations is always a factor that restricts the development of simulation techniques. To improve the accuracy and efficiency of seismic numerical simulations of goaf areas, an improved vacuum method has been incorporated into a rotated staggered grid scheme and calculations implemented by combining parallel computing and task parallelism. This ensures that the proposed numerical simulation method can be utilized in a geological model with large differences in elastic parameters among layers and improve the performance of a parallel application by enabling the full use of processor resources to expedite the calculations. We set up anisotropic coal seam models and then analyze numerically the characteristics of synthetic seismograms and snapshots of different goaf areas with or without collapse. The results show that the proposed method can accurately simulate the goaf area and the calculation method can run with a high speed and parallel efficiency. The research will further advance the technology of anisotropic seismic exploration in coal fields, provide data for seismic inversion and build a theoretical support for coal mine disaster prediction.
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We wish to thank the reviewers for their valuable suggestions and, at the same time, we express our sincere thanks to the Chief Editor of Applied Geophysics, Fan Wei-cui for her dedication and rigorous scientific approach.
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This work was supported by the National Natural Science Foundation of China (Nos. 41304105 and 41674135) and the Natural Science Foundation of Shaanxi province (No. 2016JM4010).
Li Qin, Ph.D., associate professor. In 2011, she graduated from the earth exploration and information technology major of Chang’an university, and now works in the school of geology and environment of Xi’an university of science and technology. It is mainly engaged in the research of seismic anisotropy.
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Li, Q., Ma, SB., Zhao, B. et al. An improved rotated staggered grid finite difference scheme in coal seam. Appl. Geophys. 17, 890–898 (2020). https://doi.org/10.1007/s11770-018-0717-2
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DOI: https://doi.org/10.1007/s11770-018-0717-2