Petrophysical characterization of high-rank coal by nuclear magnetic resonance: a case study of the Baijiao coal reservoir, SW China.

ABSTRACT: To better apply nuclear magnetic resonance (NMR) to evaluate the petrophysical characterization of high-rank coal, six anthracite samples from the Baijiao coal reservoir were measured by NMR. The porosity, T ₂ cutoff value, permeability and pore type were analysed using the transverse relaxation time (T ₂) spectrum before and after centrifugation. The results show that the T ₂ spectrum of water-saturated anthracite can be divided into a discontinuous and continuous trimodal distribution. According to the connectivity among pores, three T ₂ spectrum peaks were identified at the relaxation times of 0.01-1.7 ms, 1.7-65 ms and greater than 65 ms, which correspond to the micropores (less than 100 nm), mesopores (100-1000 nm

SUBMITTER: Zhang D 

PROVIDER: S-EPMC6304127 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature