caa a22 4500 445299517 CHVBK 20180317142552.0 cr unu---uuuuu 170323e20100601xx s 000 0 eng 10.1007/s11430-010-0057-4 doi (NATIONALLICENCE)springer-10.1007/s11430-010-0057-4 Advanced characterization of pores and fractures in coals by nuclear magnetic resonance and X-ray computed tomography [Elektronische Daten] [YanBin Yao, DaMeng Liu, YiDong Cai, JunQian Li] This paper demonstrates capabilities of low-field nuclear magnetic resonance (NMR) and microfocus X-ray computed tomography (μCT) in advanced, nondestructive, and quantitative characterization of pore types, producible porosity, pore structure, and spatial disposition of pore-fractures in coals. Results show that the NMR transverse relaxation time (T 2) at 0.5-2.5, 20—50, and >100 ms correspond to pores of <0.1 μm, >0.1 μm, and fractures, respectively. A much higher T 2 spectrum peak reflects a much better development of pores (or fractures) corresponding to the T 2, and vice versa. Three basic components in coals, i.e., the pores (or fractures), coal matrix, and minerals have their distinctive range of CT numbers. Among these, the CT number of pores is commonly less than 600 HU. The producible porosity, which is a determination of permeability, can be calculated by T 2 cutoff value (T 2C) of coal NMR. The coal pore structure can be efficiently estimated by the newly proposed "T 2C based model”. Finally, μCT scan was proven capable of modeling and spatial visualization of pores and fractures. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 coalbed methane nationallicence pore nationallicence fracture nationallicence nuclear magnetic resonance (NMR) nationallicence X-ray computed tomography (X-CT) nationallicence Yao YanBin School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut Liu DaMeng School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut Cai YiDong School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut Li JunQian School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut Science China Earth Sciences SP Science China Press 53/6(2010-06-01), 854-862 1674-7313 53:6<854 2010 53 11430 https://doi.org/10.1007/s11430-010-0057-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-0057-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yao YanBin School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut NATIONALLICENCE 700 1- Liu DaMeng School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut NATIONALLICENCE 700 1- Cai YiDong School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut NATIONALLICENCE 700 1- Li JunQian School of Energy Resources, China University of Geosciences, 100083, Beijing, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/6(2010-06-01), 854-862 1674-7313 53:6<854 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer