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Applied Geophysics

, Volume 14, Issue 4, pp 480–491 | Cite as

Physical properties, vitrinite reflectance, and microstructure of coal, Taiyuan Formation, Qinshui Basin, China

  • Qiong Li
  • Jie Chen
  • Jian-Jun He
Article
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Abstract

In this study, we experimentally established the relationship between physical properties, vitrinite reflectance, and microstructure of coal, Taiyuan Formation, Qinshui Basin, China using representative coal samples collected from three different mines via the rock mechanics testing system (MTS). We analyzed the organic macerals, vitrinite reflectance, and microstructure of 11 coal samples using petrography and scanning electron microscopy (SEM). The experimental results suggest that (1) the elastic parameters can be described by linear equations, (2) both P-and S-wave velocities display anisotropy, (3) the anisotropy negatively correlates with vitrinite reflectance, and (4) the acoustic velocities and Young’s modulus are negatively correlated with the volume of micropores. The derived empirical equations can be used in the forward modeling and seismic inversion of physical properties of coal for improving the coal-bed methane (CBM) reservoir characterization.

Keywords

Coal physical properties ultrasonic testing microstructure 

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Notes

Acknowledgments

The authors thank Y.M. Shan and M.S. Feng from the State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology) for their assistance with the ultrasonic testing, thin section analysis, and SEM imaging. The authors also acknowledge the help from colleagues and graduate students in sample collection and preparation. The authors are also indebted to Dr. Bo Zhang of the University of Alabama for his constructive suggestions. Finally, we wish to thank the reviewers for their valuable comments as well as the chief editor Fan Wei-Cui for editing.

References

  1. Castagna, J. P., Batzle, M. L., and Kan, T. K., 1993, Rock physics—The link between rock properties and AVO response: in J. P. Castagna and M. M. Backus, eds., Offset-dependent reflectivity—Theory and practice of AVO analysis: SEG Investigations in Geophysics, 8, 135–171.Google Scholar
  2. Chen, X. P., Huo, Q. M., Lin, J. D., et al., 2013, The inverse correlations between methane content and elastic parameters of coal-bed methane reservoirs: Geophysics, 78(4), D237–D248.Google Scholar
  3. Dirgantara, F., Batzle, M. L., and Curtis, J. B., 2011, Maturity characterization and ultrasonic velocities of coals: 81st Annual International Meeting, SEG, Expanded Abstracts, 2308–2312.Google Scholar
  4. Gray, D., 2005, Seismic anisotropy in coal beds: 75th Annual International Meeting, SEG, Expanded Abstracts, 142–145.Google Scholar
  5. Greenhalgh, S. A., and Emerson, D. W., 1986, Elastic properties of coal measure rocks from the Sydney Basin, New South Wales: Exploration Geophysics, 17(3), 157–163.Google Scholar
  6. Li, Q., He, J. J., and Cao, J., 2013, Physical characteristics of coalbed methane reservoir in Heshun Area of Qinshui Basin: Oil Geophysical Prospecting (in Chinese), 48(5), 734–739.Google Scholar
  7. Lwin, M. J., 2011, The effect of different gases on the ultrasonic response of coal: Geophysics, 76(5), E155–E163.Google Scholar
  8. Meng, Z. P., Zhang, J. C., and Wang, R., 2011, In-situ stress, pore pressure and stress-dependent permeability in the Southern Qinshui Basin: International Journal of Rock Mechanics & Mining Sciences, 48(1), 122–131.Google Scholar
  9. Morcote, A., Mavko, G., and Prasad, M., 2010, Dynamic elastic properties of coal: Geophysics, 75(6), E227–E234.Google Scholar
  10. Pan, J. N., Meng, Z. P., Hou, Q. L., Ju, Y. W., and Cao, Y. X., 2013, Coal strength and Young’s modulus related to coal rank, compressional velocity and maceral composition: Journal of Structural Geology, 54, 129–135.Google Scholar
  11. Thomsen, L., 1986, Weak elastic anisotropy: Geophysics, 51(10), 1954–1966.Google Scholar
  12. Wang, H. C., Pan, J. N., Wang, S., and Zhu, H. T., 2015, Relationship between macro-fracture density, P-wave velocity, and Permeability of coal: Journal of Applied Geophysics, 117, 111–117.Google Scholar
  13. Wu, H. B., Dong, S. H., Li, D. H. Huang, Y. P., and Qi, X. M., 2015, Experimental study on dynamic elastic parameters of coal samples: International Journal of Mining Science and Technology, 25(3), 447–452.Google Scholar
  14. Yao, Q. L., and Han, D. H., 2008, Acoustic properties of coal from lab measurement: 78th Annual International Meeting, SEG, Expanded Abstracts, 1815–1819.Google Scholar
  15. Yu, G., Vozoff, K., and Durney, D. W., 1993, The influence of confining pressure and water saturation on dynamic elastic properties of some Permian coals: Geophysics, 58(1), 30–38.Google Scholar
  16. Yushendri, Y. F., Sukotjo, A., Raguwanti, R., Widarto, D. S., and Nurhandoko, B. E. B., 2013, Seismic rock physics of the South Sumatra basin coal, Indonesia: Proceeding of the 11th SEGJ International Symposium, 402–406.Google Scholar

Copyright information

© Editorial Office of Applied Geophysics and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.College of GeophysicsChengdu University of TechnologyChengduChina
  2. 2.College of Information Science & TechnologyChengdu University of TechnologyChengduChina

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