Journal
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Volume 63, Issue -, Pages 58-69Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2019.01.010
Keywords
Pore structure; Fractal dimension; Medium-high rank coals; Main coal-bearing syncline in western Guizhou
Categories
Funding
- National Natural Science Foundation of China [U1703126, 41530314]
- Key Project of the National Science Technology [2016ZX05044-001]
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The coal pore structure is closely related to the accumulation and migration of coalbed methane (CBM). This study collected 12 coal samples in western Guizhou and used low-temperature carbon dioxide adsorption/desorption (LT-CO(2)GA), low-temperature nitrogen adsorption/desorption (LT-N(2)GA) and nuclear magnetic resonance (NMR) experimental methods to systematically discuss the pore structure and fractal characterization of main coal-bearing syncline. The study shows that coal rank is an important reason for the difference of 6 synclines coal reservoirs. Bide syncline and Panguan syncline have similar pore structure and fractal characteristics. As the coal rank increases, the DR-SSA, DA-TPV, D-2, DNMR and V-L increase linearly, whereas the BET-SSA and BJH-TPV decrease gradually. Moreover, the connectivity between pores decreases with increasing coal rank. A positive correlation is observed between coal rank, BET-SSA, and BJH -TPV and D-2, whereas a negative correlation is seen between moisture, ash yield and D-2. DNMR is positively correlated with coal rank, mineral content and ash yield, but negatively correlated with volatile matter content. Although the north synclines have good gas content and a good development potential, poor connectivity and high heterogeneity must be valued during the development process.
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