Application of NMR in Coal Reservoir Characterization

Abstract:

Nuclear Magnetic Resonance (NMR) can provide information about pore and fracture structures, porosity and permeability of reservoirs. It can deep into materials without destroying samples, with advantages such as rapid, accurate and high resolution. This paper introduced the experimental principles and carried out a series of NMR experiments based on high rank coal and low rank coal samples. Results show that: the T₂ spectra of high rank coal samples have an independent trimodal distribution with the main peak located at the low T₂ value section, indicating that high rank coal is dominated by micropores and transition pores; while the T₂ spectrum of low rank coal samples show a continuous trimodal distribution with the main peak located at the high T₂ value section, demonstrating the dominance of macropores, mesopores and fractures. The pore and fracture structures of low rank coals are significantly favorable than those of high rank coals.

• Periodical: Advanced Materials Research (Volumes 765-767)
• Pages: 2168-2171
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.765-767.2168
• Online since: September 2013
• Authors: Zi Yang, Xiao Hua Pan, Sheng Qiang Yuan, Zhi Feng Ji
• Keywords: Coal Rank, Coal Reservoir, Fracture Structure, Movable Porosity, Nuclear Magnetic Resonance (NMR), Pore Structure

References

[1] Liu D.M., Yao Y.B., Tang D.Z., Tang, S.H., Che Y. and Huang, W. H: International Journal of Coal Geology Vol. 79 (2009), pp.97-112.

[2] Yao, Y.B., Liu, D.M., Tang, D.Z., Tang, S.H. and Huang, W. H: International Journal of Coal Geology, Vol. 73, (2008), pp.27-42.

[3] Yao, Y.B., Liu, D.M., Tang, D.Z., Tang, S.H., Huang, W.H., Liu, Z.H. and Che, Y: Computer & Geosciences, Vol. 35, (2009), pp.1159-1166.

[4] Crosdale, P.J., Beamish, B.B. and Valix, M: International Journal of Coal Geology, Vol. 35, (1998), pp.147-158.

DOI: 10.1016/s0166-5162(97)00015-3

[5] Unsworth, J.F., Fowler, C.S. and Jones, L. F: Fuel, Vol. 68, (1989), pp.18-26.

[6] Xu H., Zhang S.H., Leng X., Tang D.Z. and Wang M. S: Chinese Science Bulletin Vol. 50, (2005), pp.45-50.

[7] Kevin, M., Douglas, M., Smith, A: Journal of Colloid and Interface Science, Vol. 19 (1), (1987). pp.117-126.

[8] Hodgkins, M.A., Howard, J. J: AAPG Bull, Vol. 83, (1999), pp.114-127.

[9] Kenyon, W. E: Nuclear Geophysics, Vol. 6 (2), (1992), pp.153-171.

[10] Straley, C., Rossini, D., Vinegar, H., Tutunjian, P., Morriss, C: Log Anal, Vol. 38, (1997), pp.84-93.

[11] Kleinberg R. L., Vinegar H. J: The Log Analyst, Vol. 37, (1996), pp.20-32.

[12] Zhongdong Wang, Hao Wang, Nenggen Li, Longlai Qiao: Well Logging Technology, Vol. 25 (3), (2001), pp.170-174 (in Chinese).

[13] Xiaowen Wang, Lizhi Xiao, Ranhong Xie, Yuanzhong Zhang: Science in China (Series G: Physics, Mechanics & Astronomy), Vol. 49 (3), (2006), pp.313-320 (in Chinese).

[14] Ranhong Xie, Lizhi Xiao, Zhongdong Wang, Kejun Deng: Science in China (Series D: Earth Sciences), Vol. 51, (2008), pp.212-217 (in Chinese).

[15] Liang Xiao, Zhongxiang Xiao: Progress in Geophysics, Vol. 23 (1), (2008), pp.167-172 (in Chinese).

[16] Ranhong Xie, Lizhi Xiao, Taiping Zhao: Nuclear Electronics & Detection Technology, Vol. 27 (2), (2007), pp.194-198 (in Chinese).

[17] Lizhi Xiao, Hongbing Shi: Well Logging Technology, Vol. 22 (1), (1998), pp.42-49 (in Chinese).

[18] Weimin Wang, Hekun Guo, Zhaohui Ye: Acta Petrolei Sinica, Vol. 22 (6), (2001), pp.40-44(in Chinese).

[19] Ruifei Wang, Mingqiang Chen: Acta Petrolei Sinica, Vol. 29 (4), (2008), pp.558-561(in Chinese).

[20] Timur, A: Journal of Petroleum Technology, Vol. 21 (6), (1969), pp.775-786.