Geomechanics and Engineering

  • 제6권6호
  • /
  • Pages.613-624
  • /
  • 2014
  • /
  • 2005-307X(pISSN)
  • /
  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Relationship of fractures in coal with lithotype and thickness of coal lithotype

  • Pan, Jienan (School of Resources and Environment, Henan Ploytechnic University) ;
  • Wang, Haichao (School of Resources and Environment, Henan Ploytechnic University) ;
  • Wang, Kai (School of Resources and Environment, Henan Ploytechnic University) ;
  • Niu, Qinghe (School of Resources and Environment, Henan Ploytechnic University)
  • 투고 : 2013.10.31
  • 심사 : 2014.02.07
  • 발행 : 2014.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

The fractures in coal are the main migration and output channels of coalbed methane, directly influencing the permeability of the coal seams. It is of great significance to study the effect of fracture distribution in coals on the permeability of coal seam. The development rules of endogenetic and exogenetic fractures are different among various coal lithotypes. There is also difference in the fracture density for the same lithotype with different thicknesses. Through the observation and description of the macroscopic fractures in coal and the origin of fractures in coal, the effect of the coal lithotype and its thickness on fracture development in coal was discussed. It was found through the study that the density of fractures in vitrain band was the maximum for the same coal rank and thickness, followed by clarain band. There were few fractures developed in the durain band. However, the changes of fracture density in three types of bands presented different declining trends for low, medium and high coal rank. There were no fractures developed in the fusain. There were three variation patterns for the fracture densities at the same coal rank and coal lithotype: linear decrease, nonlinear decrease, and first decrease then remaining unchanged. However, the overall trend was that the fracture density decreased with the increase of thickness of coal band for the same coal rank and coal lithotype.

키워드

참고문헌

  1. Bi, J.J., Su, X.B. and Han, D.X. (2001), "The relation between cleat frequency and coal rank", J. China Coal Soc., 26(4), 346-349. [In Chinese]
  2. Chatterjee, R. and Pal, P.K. (2010), "Estimation of stress magnitude and physical properties for coal seams of Rangamati area, Raniganj coalfield, India", Int. J. Coal Geol., 81(1), 25-36. https://doi.org/10.1016/j.coal.2009.10.006
  3. Daniels, E.J. and Altaner, S.P. (1990), "Clay mineral authigenesis in coal and shale from the Anthracite region, Pennsylvania", Am. Mineralogist., 75(7-8), 825-839.
  4. Daniels, E.J., Marshak, S. and Altaner, S.P. (1996), "Use of clay-mineral alteration patterns to define syntectonic permeability of joints (cleat) in Pennsylvania anthracite coal", Tectonophysics., 263(1), 123-136. https://doi.org/10.1016/S0040-1951(96)00019-4
  5. Dawson, G.K.W. and Esterle, J.S. (2010), "Controls on coal cleat spacing", Int. J. Coal Geol., 82(3-4), 213-218. https://doi.org/10.1016/j.coal.2009.10.004
  6. Durucan, S. and Edwards, J.S. (1986), "The effects of stress and fracturing on permeability of coal", Mining Sci. Tech.., 3(3), 205-216. https://doi.org/10.1016/S0167-9031(86)90357-9
  7. Gamson, P.D., Beamish, B.B. and Johnson, D.P. (1993), "Coal microstructure and micropermeability and their effects on natural gas recovery", Fuel, 72(1), 87-99. https://doi.org/10.1016/0016-2361(93)90381-B
  8. Gresley, W.S. (1892), "Theory for "Cleat" in Coal-Seams", Geological Magazine., 9(11), p. 523. https://doi.org/10.1017/S0016756800196074
  9. Harpalani, S. and Chen, G.L. (1997), "Influence of gas production induced volumetric strain on permeability of coal", Geotech. Geol. Eng., 15(4), 303-325.
  10. Karacan, C.O. and Okandan, E. (2000), "Fracture/cleat analysis of coal from Zonguldak Basin (northwestern Turkey) relative to the potential of coalbed methane production", Int. J. Coal Geol., 44(2), 109-125. https://doi.org/10.1016/S0166-5162(00)00004-5
  11. Kumar, H., Lester, E. and Kingman, S. (2011), "Inducing fractures and increasing cleat apertures in a bituminous coal under isotropic stress via application of microwave energy", Int. J. Coal Geol., 88(1), 75-82. https://doi.org/10.1016/j.coal.2011.07.007
  12. Laubach, S.E., Marrett, R.A. and Olson, J.E. (1998), "Characteristics and origins of coal cleat: A review", Int. J. Coal Geol., 35(1-4), 175-207. https://doi.org/10.1016/S0166-5162(97)00012-8
  13. Levine, J.R. (1996), "Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs", Geological Society Special Publication., 109(1), 197-212. https://doi.org/10.1144/GSL.SP.1996.109.01.14
  14. Meng, Z.P., Zhang, J.C. and Wang, R. (2011), "In-situ stress, pore pressure and stress-dependent permeability in the Southern Qinshui Basin", Int. J. Rock Mech Mining Sci., 48(1), 122-131. https://doi.org/10.1016/j.ijrmms.2010.10.003
  15. Moore, T.A. (2012), "Coalbed methane: A review", Int. J. Coal Geol., 101, 36-81. https://doi.org/10.1016/j.coal.2012.05.011
  16. Paul, S. and Chatterjee, R. (2011a), "Determination of in-situ stress direction from cleat orientation mapping for coal bed methane exploration in south-eastern part of Jharia coalfield, India", Int. J. Coal Geol., 87(2), 87-96. https://doi.org/10.1016/j.coal.2011.05.003
  17. Paul, S. and Chatterjee, R. (2011b), "Mapping of cleats and fractures as an indicator of in-situ stress orientation, Jharia Coalfield, India", Int. J. Coal Geol, 88(2-3), 113-122. https://doi.org/10.1016/j.coal.2011.09.006
  18. Pollard, D.D. and Aydin, A. (1998), "Progress in understanding jointing over the past century", Geological Society of America Bulletin., 100(8), 1181-1204.
  19. Price, N.J. (1959), "Mechanics of Jointing in Rocks", Geological Magazine., 96(2), 149-167. https://doi.org/10.1017/S0016756800060040
  20. Rippon, J.H., Ellison, R.A. and Gayer, R.A. (2006), "A review of joints (cleats) in British Carboniferous coals: indicators of palaeostress orientation", Proceedings of the Yorkshire Geological Society, 56(1), 15-30. https://doi.org/10.1144/pygs.56.1.15
  21. Secor, D.T. (1965), "Role of fluid pressure in jointing", Am. J. Sci., 263(8), 633-646. https://doi.org/10.2475/ajs.263.8.633
  22. Segall, P. (1984), "Formation and growth of extensional fracture sets", Geol. Soc. Am. Bulletin., 95(4), 454-462. https://doi.org/10.1130/0016-7606(1984)95<454:FAGOEF>2.0.CO;2
  23. Spearsa, D.A. and Caswell, S.A. (1986), "Mineral matter in coals: cleat minerals and their origin in some coals from the English midlands", International Journal of Coal Geology., 6(2), 107-125. https://doi.org/10.1016/0166-5162(86)90015-7
  24. Steeg, K.V. (1942), "Jointing in the coal beds of Ohio", Economic Geology., 37(6), 503-509. https://doi.org/10.2113/gsecongeo.37.6.503
  25. Su, X.B., Feng, Y.L. and Chen J.F. (2001), "The characteristics and origins of cleat in coal from Western North China", Int. J. Coal Geol., 47(1), 51-62. https://doi.org/10.1016/S0166-5162(01)00026-X
  26. Su, X.B., Feng, Y.L. and Chen, J.F. (2002), "The classification of fractures in coal", Coal Geol. Exploration, 30(4), 21-24. [In Chinese]
  27. Ting, F.T.C. (1977), "Origin and spacing of cleats in coal beds", J. Press. Vess-T., ASME, 99(4), 624-626. https://doi.org/10.1115/1.3454584
  28. Wang, S.W. and Chen, Z.H. (1995), "Advances in the research of pore-fracture system in coal reservoir", Geol. Sci. Tech. Info., 14(1), 53-58. [In Chinese]
  29. Wang, S.W., Zhang, M. and Zhuang, X.L. (1996), "The mechanism of microfractures and cleats of coal reservoirs and their implication for methane recovery", Earth Sci. - J. China Univ. of Geosci., 21(6), 637-640. [In Chinese]
  30. Wang, S.W., Duan, L.X. and Chen, Z.H. (2004), "Reservoir evaluation for exploration and development of coal-bed gas", Natural Gas Industry., 24(5), 82-84. [In Chinese]
  31. Zhang, C.L., Li, T.R. and Xiong, Q.H. (2000), "Relationship between lithostructure and fracture distribution in coal", Coal Geol. Exploration., 28(5), 26-30. [In Chinese]
  32. Zhang, Q., Chen, P.Y. and Dou, T.H. (2001), Classification Of Macerals For Bituminous Coal, China Zhijian Publishing House, Beijing, China. [In Chinese]
  33. Zhang, H., Wang, X.G. and Yuan, Z.R. (2002), "Genetic types of microfractures in coal and their significance", Acta Petrologica Et Mineralogica., 21(3), 278-284. [In Chinese]
  34. Zhong, L.W. (2004), "The genesis of endogenic fracture in coal",Coal Geol. China., 16(3), 6-9. [In Chinese].

피인용 문헌

  1. Relationship between macro-fracture density, P-wave velocity, and permeability of coal vol.117, 2015, https://doi.org/10.1016/j.jappgeo.2015.04.002
  2. Assessment of properties of coal seams as destructible environments vol.837, pp.None, 2014, https://doi.org/10.1088/1757-899x/837/1/012009
  3. Analysis of hydraulic fracture behavior and well pattern optimization in anisotropic coal reservoirs vol.39, pp.1, 2014, https://doi.org/10.1177/0144598720960833
  4. Effect of interlayer mechanical properties on initiation and propagation of hydraulic fracturing in laminated coal reservoirs vol.208, pp.no.pa, 2014, https://doi.org/10.1016/j.petrol.2021.109381