Author(s)

Dongmin Ma^1,2, Qian Li¹, Qian He¹, Chuantao Wang¹

¹College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, China.
²National Energy Key Laboratory of Coal and CBM Simultaneous Extraction, Jincheng, China.

The low rank coalbed methane (CBM) has great potential for exploration and development in China, but its exploitation level is low at present stage. The pores are the storage space of CBM, so recognizing its structural characteristics has very important practical significance for the development of CBM. The samples of No. 4 and upper No. 4 coalbed in Dafosi were selected to carry out the analysis of mercury injection test, nitrogen adsorption test and scanning electron microscopy to study the different lithotypes of the pore structure, pore throat distribution and fracture character of low rank coal reservoir. The results showed that micropore of low rank coal in Dafosi relatively developed and the pore volume of vitrain was equivalent to durain. The pore throat of durain was larger than vitrain, the connectivity was better and the fissures were more developed. The percolation capacity and reservoir performance of upper No. 4 coal was better than No. 4 coal. Generally, the potential of exploration and development of upper No. 4 coal in the study area was better than that of No. 4, and the developed area of durain was more beneficial for the development of CBM.

Low Rank Coal, Vitrain, Durain, Pore Characteristic, Coalbed Methane

Ma, D. , Li, Q. , He, Q. and Wang, C. (2017) Pore Characteristics of Vitrain and Durain in Low Rank Coal Area. Journal of Power and Energy Engineering, 5, 10-20. doi: 10.4236/jpee.2017.511002.